1.

What are the minimum requirements for growing cells in culture?

Group of answer choices

Complete culture medium, pH around 7.4 and a 5% CO2 atmosphere

Complete culture medium, pH around 7.4 and a 15% CO2 atmosphere

Complete culture medium, pH around 9.4 and a 5% CO2 atmosphere

Basal medium, pH around 7.4 and a 5% CO2 atmosphere

2.

What is the condition under the air flow hood like

Group of answer choices

Very clean but not absolutely sterile

Absolutely sterile

Complete asepticall

high level of of CO2

3.

How you detach the adherent cell when you need to sub-culture ?

Group of answer choices

All of them are possible method

enzymatic dissociation

Shaking off

using scraper

Only a subset of a cell's genes are expressed or turned on. The phrase "expresses" or "turns on" indicates that that gene is creating protein. Gene regulation is the process of turning genes on and off.

A gene is a segment of DNA that encodes for a specific protein. DNA is the information database of the cell and is contained within the cell nucleus. It carries all of the crucial genetic instructions for generating the proteins that our cells require.

Each gene contains a unique collection of instructions, which are normally encoded and used for a certain function or protein.

Gene expression is the process by which the genetic blueprints of genes are employed to manage the protein synthesis required by our bodies to form cell structures. Structural genes are those that carry information essential for amino acid sequences. This procedure consists of two crucial steps:

Transcription- The messenger RNA is created in this phase with the help of RNA polymerase enzymes, culminating in the processing of mRNA molecules.

Translation- The primary purpose of mRNA is to direct protein synthesis, which results in post-translational modification of the protein molecules.

During gene expression, genetic codes from the DNA code are translated and transcriptionally transformed into proteins. The process of an organism's genetic makeup as physical features is depicted through genetic expression. The information travels from genes to proteins throughout this process.

Gene regulation differs depending on whether the organism is prokaryotic or eukaryotic. Eukaryotes include both multicellular and unicellular species such as mammals, fungi, plants, and protists that have cells with nuclei and other organelles. Prokaryotes are single-celled organisms that, like bacteria, lack a well-defined nucleus. Because eukaryotes have a well-defined nucleus and prokaryotes have not, the regulation of prokaryotic and eukaryotic transcription is fundamentally different.

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The sodium-potassium pump maintains the resting membrane potential by moving sodium ions out and potassium ions into the cell membrane.

By exchanging three intracellular potassium ions for two extracellular sodium ions, the sodium-potassium pump contributes to the maintenance of the resting membrane potential.

The sodium-potassium pump constantly progresses three sodium ions are transported out of the cell for every two potassium ions it shifts in. As a result, it retains the huge potassium ion gradient across the membrane, which serves as the foundation for resting membrane potential.

Sodium and potassium ions are moved by the sodium-potassium pump system against huge concentration gradients. It flushes three sodium ions are transported and into the extracellular fluid while moving two potassium ions into the cell where potassium levels are elevated.

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Methylation of nucleosome n-terminal tails typically leads to transcriptional repression.

Methylation is a chemical modification that involves the addition of a methyl group (-CH3) to a molecule. In the case of nucleosomes, the n-terminal tails are proteins that extend from the nucleosome and are involved in regulating gene expression.

Methylation of these tails can prevent transcription factors from binding to DNA and activating transcription, resulting in transcriptional repression. This process is important for controlling gene expression and maintaining genomic stability.

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According to Chargaff's rule, if the percentage of A in the DNA of a species is 23%, the the amount of guanine will be 27%.

Chargaff's rule says that the in the DNA of any species the amount of guanine is equal to the amount of cytosine and the amount of adenine is equal to the amount of thymine. And also there exists a stoichiometric ratio in the purine and pyrimidine bases: A+G=T+C.

DNA stand for Deoxyribonucleic Acid. It is the genetic material found in majority of the organisms. There are various forms of DNA like A-type, B-type and Z-type. B-type DNA is the most common form which is a double-stranded helical molecule.

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The hypothalamic-pituitary-gonadal axis involves FSH and LH release.

The hypothalamic-pituitary-gonadal (HPG) axis (also known as the hypothalamic-pituitary-ovarian/testicular axis) refers to a hypothalamus, pituitary gland, as well as gonadal glands as a single entity. Because these glands frequently work together, physiologists and endocrinologists prefer to refer to them as a single system.

The HPG axis is important in the development as well as regulation of many body systems, including the immune and reproductive systems. Changes in this axis result in changes inside the hormones produced from each gland, which have a variety of local and systemic impacts on the body. In animals, the axis regulates development, reproduction, and ageing. GnRH-expressing neurons secrete gonadotropin-releasing hormone (GnRH) from the hypothalamus.

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Laying eggs, Eutherian, placental, placental mammal, mammalian- any warm-blooded animal with skin that is somewhat or mostly covered in hair.

All mammals, with the exception of marsupials and the rare subclass of monotremes, give birth to live young that are fed milk. Any warm-blooded vertebrate with skin that is more or less covered with hair is referred to as eutherian, placental, placental mammal, or mammalian. All mammals, with the exception of the rare subclass of monotremes, give birth to live young that are fed milk. Except for monotremes and marsupials, all mammals fall under the category Eutheria.

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Mammalia are animals that belong to the class Mammalia. Mammals are one of the most evolved vertebrate species in the animal kingdom.

They are found all over the world and have adapted well to their surroundings, which include oceans, deserts, and polar regions, as well as rainforests and rivers. Let us take a closer look at the characteristics and classifications of the Mammalia class of animals.

Classification of mammals

1. Mammals are warm-blooded creatures that give birth to their young.

2. They are the most common type of animal found in almost all habitats.

3. They have mammary glands, which aid in the production of milk to feed their young.

4. The presence of a brain region known as the Neocortex

5. Their skin contains oil glands (sebaceous glands) as well as sweat       glands sudoriferous glands).

6. The fur of hair that covers the body and aids animals in adapting to their surroundings.

7. They are heterodont, which means they have different types of teeth.

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answer :

b. the sahara desert has attracted

migrants to the area to herd cattle.

The desert landscape of the Sahara influenced historical migration patterns in Africa as c. The Sahara Desert has served as a barrier to travel and migration.

The Sahara Desert can be found in the north along the Tropic of Cancer, while the Namib Desert can be found in the south along the Tropic of Capricorn. The Sahara, which covers a significant portion of northern Africa, serves as a formidable barrier that separates the Muslim, Arab North of the continent from the traditional African cultural groups in the South. In a separate chapter, the cultures and political histories of North Africa and Southwest Asia are discussed together.

The landmass known as Pangaea, the last supercontinent, marks the beginning of Africa's physical geography 300 million years ago. Pangaea broke up around 175 million years ago, drifting and colliding to form the continents we know today. The center of this supercontinent was Africa.

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Answer: Kidney

Explanation: scaffolds are structures that mimic real organs.

Answer:

One example of a body part that is made up of a scaffold is the skeleton.

Explanation:

The skeleton is a structural system in the body that provides support and protection for the body's organs and tissues. It is made up of bones, which are connected to one another by joints. The bones of the skeleton are arranged in a specific pattern and shape, forming a scaffold that supports the body and allows for movement.

Other examples of body parts that are made up of scaffolds include the respiratory system, the circulatory system, and the musculoskeletal system. These systems are made up of a network of tubes, vessels, and muscles that provide support and function to the body.

Chromosomes are made up of DNA, which contain the instructions for making proteins.

What do you mean by chromosomes?

Chromosomes are structures within the nucleus of cells that contain DNA. They are composed of protein and one molecule of DNA, and they contain the genetic information that determines an organism's inherited characteristics and traits.

Genes are made up of segments of DNA, and they provide the instructions for making proteins. Proteins are the molecules that do most of the work in the cells. They are made from the instructions found in DNA, which are stored in the chromosomes.

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One or more long chains of amino acid residues make up the massive biomolecules and macromolecules known as proteins.

A polypeptide is an ordered collection of residues of amino acids. A protein has at least one lengthy polypeptide in it. Less than 20–30 residue polypeptides are frequently referred to as peptides instead of proteins and are known as short polypeptides. Peptide bonds as well as connections between nearby amino acid residues hold the individual amino acid residues together. The genetic code's encoding of a gene's sequence determines the arrangement of amino acid residues in a protein. However, in some organisms, the genetic code can also include selenocysteine and—in some archaea—pyrrolysine.

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The light reactions are the first phase of photosynthesis.

Photosynthesis occurs in two phases. In phase I, water is used to transform solar energy into chemical energy, which is then stored in ATP and NADPH. As a waste product at this stage, oxygen is also released. In phase II, glucose is created by combining carbon dioxide with chemical energy from ATP and NADPH. In the cells of plants, organelles are called chloroplasts. In chloroplast contains grana are orderly stacks that are found in each chloroplast. Thylakoid membranes, which resemble sacs, make up the grana. Photosystems, which are collections of molecules that include the green pigment chlorophyll, are found in these membranes.

Hence, the light reaction in photosynthesis is used to create energy molecules.

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Its offspring will inherit the error in the replication if the error does not prevent reproduction.

What are Gamete cells?

Gamete cells are reproductive cells that combine with another gamete cell during sexual reproduction. They contain half the genetic material of the organism, and when two gametes join together during fertilization, they form a zygote that contains the full genetic material of the organism. In humans, gamete cells are the sperm cells produced by males and the egg cells produced by females.

What is Reproduction?

Reproduction is the biological process by which the organisms create descendants. It is a fundamental feature of all known life; each individual organism exists as the result of reproduction. The known methods of reproduction are broadly grouped into two main types: sexual and asexual reproduction.

Hence, Option D is correct.

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Only acetylcholine. In addition to acting as a transmitter for the parasympathetic and somatic motor systems, acetylcholine (Ach) also has significant central nervous system effects.

At their connections with skeletal muscle fibers, all somatic motor neurons produce acetylcholine (ACh). The result is always excitatory, and the muscle fibers contract if the stimulation hits the threshold. At neuromuscular junctions, somatic motor neurons use the neurotransmitter acetylcholine to activate skeletal muscle fibers. In addition to controlling the body's voluntary motions, the somatic nervous system is also responsible charge of reflexes, a particular class of involuntary muscle reactions that are regulated by a cerebral pathway known as the reflex arc.

The complete question is:

All somatic motor neurons produce __________.

both epinephrine and norepinephrine

only norepinephrine

only acetylcholine

both acetylcholine and norepinephrine

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The statement that best describes an advantage of constructing habitat corridors is that Corridors connect habitats separated by fragmentation and connect wildlife populations. That is option A.

Habitat corridors is defined as those wildlIfe corridors that allows for a connection between populations or habitats that are isolated with the aim of promotion of genetic diversity.

The importance of habitat corridors include the following:

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The principal difference between tropical and temperate rainforests is the amount of precipitation they receive. The statement is false.

Rainforests are classified into two types: tropical and temperate. Tropical rainforests are situated closer to the equator, when temperatures are higher. Temperate rainforests can be found near colder coastal locations north or south of the equator.

The tropical rainforest is a hot, damp ecosystem with year-round rain. It is famous for its lush plant canopies that form three distinct levels. The highest layer, or canopy, comprises gigantic trees that may reach heights of 75 meters (approximately 250 feet).

A vast variety of plants from this level are commonly used as houseplants. These plants adapt quickly to residential surroundings due to the limited quantity of sunshine and rainfall they receive. Wet leaves and leaf litter cover the rainforest's lowest layer or floor.

Due to a lack of sunshine, there are few vegetation on the forest floor. However, the hot, wet environment and all of the dead plant debris offer ideal circumstances for bacteria and other microbes to thrive.

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Answer: Peared

Explanation:  The uterus, also known as the womb, is a hollow, muscular organ located in the pelvis between the bladder and rectum of individuals who are assigned female at birth. This pear-shaped organ plays a role in menstruation, pregnancy, and childbirth.

The lining of the uterus (endometrium) is the source of the blood and tissue shed each month during menstruation. After an egg released from an ovary has been fertilized, the resulting embryo implants in the uterus and fetal development begins.

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Clams do not have a centralized brain but they do possess a nervous system with a few nerve cells that regulate their movement and other body functions as well.

Clams are the animals that belong to the phylum Mollusca. They possess two valves and hence are also called bivalves. Some species of clams are edible as well. The clams are found inside the oceans on the sandy floor of the water.

Brain is the centralized organ of the nervous system found in various organisms like vertebrates. It is responsible for the regulation of the functions and activities of the organism's body.

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Increased intracellular glycogen concentration is the most likely outcome of GDP's irreversible binding to the G protein.

G proteins, sometimes referred to as guanine nucleotide-binding proteins, are a family of proteins that function as molecular switches within cells, relaying signals from a range of stimuli outside a cell to its interior. The G protein is made inactive when GDP binds to it in an irreversible manner. GTP initiates the protein by switching the GDP, and the G protein subsequently releases its signal. The non-response to norepinephrine binding and to the beta-adrenergic receptor, which prevents the G protein alpha subunit from being separated, causes a rise in the intracellular concentration of glycogen.

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The auditory projection pathway from start to finish by placing these structures in order, starting with the nerve leaving the inner ear the correct option is 5. Primary auditory cortex.

The vestibulocochlear nerve carries information from the receptors in the inner ear's organ of Corte (cochlear hair cells) to the brain. For conscious perception, this route ultimately connects to the primary auditory cortex. Additionally, there is concurrent unconscious processing of auditory information.

The first order neurons' cell bodies are housed in the spiral ganglion. These neurons go through the osseous spiral lamina and get input from hair cells in the Organ of Corte .The cochlear nerve is primarily made up of their core axons.

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.

The five ways to minimize microbial contamination are sanitation, sterilization, washing food before consumption, drinking plenty of water and ensure sufficient sunlight/ ventilation.

Microbial contamination refers to microbial infestation or inclusion into human body. It can be intentional or unintentional. The major microbes are fungi, yeast, virus or protozoans. They cause diseases which may be fatal for human health. It is important to protect oneself from such infection and some ways can be by ensuring hygiene and cleanliness around our houses and inside the houses too. There should not be any water logging. Vaccination also helps us to fight against several disease causing organisms by introduction of antibodies inside the human body. Drinking water helps to remove dead, weakened organism to be flushed out by urination. Sunlight helps to weaken the organisms by partially deactivating them due to high temperature.

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If I were a marine biologist who wanted to study organisms that are capable of chemosynthesis, I would collect organisms for my research from a variety of deep ocean environments. These environments include hydrothermal vents, methane seeps, cold seeps, and whale falls.

Hydrothermal vents are located near tectonic boundaries in the deep ocean, and are characterized by high concentrations of hydrogen sulfide, a compound that serves as a source of energy for many organisms. These vents are home to a variety of chemosynthetic bacteria, including species of bacteria that can directly use hydrogen sulfide for chemosynthesis. I would collect organisms from hydrothermal vents by using submersible vehicles that can reach the depths at which these vents are found.

Methane seeps are another environment where chemosynthetic organisms are found. Methane is released from seeps, and this methane serves as a source of energy for chemosynthetic bacteria. I would collect organisms from methane seeps using submersible vehicles equipped with sampling devices, such as coring devices or sediment traps.

Cold seeps are another environment where chemosynthetic organisms are found. These seeps are characterized by the presence of methane, which is produced by bacteria. I would collect organisms from cold seeps using submersible vehicles equipped with sampling devices, such as coring devices or sediment traps.

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Every cell in the single cell layer of a simple epithelium is in direct contact with the basement membrane beneath it.

They will include:

Simple squamous epithelium has a single layer of flat cells that is in contact with the basal lamina. They can be found, among other locations, in the lining of the heart, blood arteries, lymph vessels, and pulmonary air sacs. They consist of a single layer of nucleated flat cells.

Cuboidal epithelium lines tiny channels and tubules. It is connected to both secretion and absorption. They are composed of cells that are cube-shaped and have circular nuclei in the middle or somewhat to the bottom.

Adipocytes make up the connective tissue in adipose tissue. Adipose tissue's main purposes are to store fat and provide insulation. It is located close to internal organs and beneath the skin. The cytoplasm and nucleus are pushed outside by lipid droplets.

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Answer: Bundles

Explanation:

The smooth muscle cells are small. These cells are spindle in shape and they do not exhibit striations. They appear in the form of bundles of thin and thick filaments.

The smooth muscles are involuntary muscles. The cells of these muscles have nucleus that is located in the center. These muscles contract automatically and slowly.

On the basis of the above description, the description of the smooth muscles can be related to the bundles.

Happy Holidays!!

Answer: d

Explanation: so u dont gotta read everything else the other person put

Cookies from the constants brand kids will do better if they are given cookies before to the test.

The kids will do better if they are given cookies before to the test. Cookies from the constants brand, DV kids with cookies, and IV cookies control.

Hypothesis for an experiment students do better on tests with independent and dependent variables and constants in groups.

Therefore, Group: Children not given cookies kids in an experimental group eating cookies.

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Answer:

A well-organized nucleus and chloroplasts can prove that it's a plant cell.

Explanation:

A prokaryotic cell will not have a well-organized nucleus as they just have strands of DNA. An animal cell will not have chloroplasts as they do not photosynthesize.

Two cell parts would show that the cell was a plant cell, and not a cell of a prokaryote or an animal are the Cell wall and chloroplast

In contrast to plant cells, animal cells lack centrioles, centrosomes (which are discussed under the cytoskeleton), numerous smaller vacuoles, and lysosomes. Unlike animal cells, plant cells have a large central vacuole and a cell wall made of cellulose, chloroplasts, plasmodesmata, and plastids used for storage. The nucleus of a prokaryote cell lacks a nuclear membrane, there are no organelles with a membrane around them (such as mitochondria or plastids), and the cell wall is usually present. It is made of peptidoglycan, and the nucleoid that contains the genetic material is there.

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Answer:

Germline mutations occur in gamets.

Mendel then combined these plant lines for purebreeding and noted the characteristics of the hybrid offspring. He discovered that every F1 hybrid of the first generation resembled one of the mother plants.

Mendel observed that the F1 generation produced by hybridizing true-breeding  progeny plants only exhibited one feature of a characteristic. A true-breeding purple-flowering plant, for instance, might have been crossed with a truthful white-flowering plant.

However, Mendel found that crossing two distinct purebred plant varieties resulted in offspring that resembled either of the parents, not a combination of the two.

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