Explanation:
Scientists didnt belive that there are cells untill robert hooke (1665). He observed the cells in a cork slice with the help of a PRIMITIVE microscope
Leeuwenhoek (1674), with the help of an improved microscope, discovered free living cells in pound water for the first time.
It was robert brown in (1831) who discovered the nucleus in the cell.
Purkinjie in 1839 coined the term 'protoplasm' for the fluid substance of the cell.
THE CELL THEORY, that all plants and animals are composed of cells and that the cell is the basic unit of life, was presented by two biologists, schleiden (1838) and schwann(1839). The cell theory was fuether expanded by virchow (1855) by suggesting that all cells aris form PRE-EXISTING cells. With the discovery of the electron microscope in 1940,it was possible to observe and understand the complex structure of the cell and its various organelles.
Well, thats the history of the discovery of cells.
A new variety of CHNOPS monster with purple skin was recently discovered in Houston, Texas. Purple skin is created by a specific protein made of the following amino acids: Asp-Arg - Cys, Using the amino acids given, provide a possible DNA segment these could have been coded from (Hint: Work Backwards)
A.GOU AGA ACA
B.OCCA TCT TGA
C.CCA TCT ACA
Answer:
The answer is B
Explanation:
I had this question on my test last week
No plagiarizing from websites!
Many people feel the use of stem cells has great potential for scientific and medical progress, while others have been opposed to it. Today there is a great deal of debate about stem cell research using pluripotent stem cells from an embryo. Provide an argument for people in favor of continuing stem cell research. Include in your answer the uses of stem cell research and a suggestion for obtaining a source of stem cells without risk to life. (2 points)
Answer:
Stem cells can benefit humanity in a variety of ways, one, being the ability to develop into another cell. This is remarkable for people who have diseases and or health issues, requiring them to replace cells that they lack. Not only that, but they help treat diseases like stroke, heart disease and diabetes.
Feedback is always appreciated. Hope this helps you.
How can a shortage of nutrients harm organisms in an ecosystem? How can an excess of nutrients harm organisms in an ecosystem? Give an example of each scenario to support your answers.
Answer:
Explanation:
Shortage of nutrients in an ecosstem can harm an organism because when nutrients are scarse or very limited for organism and did not meet up with the organism requirements, there will be reduced metabolism and this can cause malfunction. Shortage of nutrients can lead to decline in growth and can lead to spring up of some diseases in the organism because enough nutrients us not available for good metabolic processes and fight diseases.
For example when an organism is deficient in vitamins and carbohydrates, the organism will not have energy to power metabolic processes and for it's activities and vitamins deficient will make the organism not to have the ability to fight against disease.
Too much of nutrients also affect organisms negatively. When there is much build up of nutrients, it can be harmful to the organisms and restrict metabolic processes.
For example too much of nutriwnts like too much of fat can block blood artieries and veins and thus can lead to inability of blood to flow .
How many H2O molecules are created from 1 glucose molecule in the electron transport chain. (cellular respiration)
Answer: 6 molecules
Explanation: Knowing that in the end, you get 6 molecules of water from one glucose molecule. In the electron transport chain, hydrogen atoms are being added to available oxygen in order to produce water.
Summarize the three main reasons why energy is wasted at each trophic level. (use your own words)
Answer:
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level. ... A food chain can usually sustain no more than six energy transfers before all the energy is used up.
Why is DNA in the world?
Answer: Nine years ago I jumped at an opportunity to join the international team that was identifying the sequence of DNA bases, or “letters,” in the genome of the common chimpanzee (Pan troglodytes). As a biostatistician with a long-standing interest in human origins, I was eager to line up the human DNA sequence next to that of our closest living relative and take stock. A humbling truth emerged: our DNA blueprints are nearly 99 percent identical to theirs. That is, of the three billion letters that make up the human genome, only 15 million of them—less than 1 percent—have changed in the six million years or so since the human and chimp lineages diverged.
Evolutionary theory holds that the vast majority of these changes had little or no effect on our biology. But somewhere among those roughly 15 million bases lay the differences that made us human. I was determined to find them. Since then, I and others have made tantalizing progress in identifying a number of DNA sequences that set us apart from chimps.
An Early Surprise
The zebra mussel is a highly invasive species that was accidentally introduced to the Great Lakes region of the United States in the 1980s. The map below shows the distribution of zebra mussels in 2010.
Answer:
you didn't ask a question
Explanation:
List the structure(s) that form the boundary between the inside and the outside of each cell in
Model 2.
Answer:
Explanation:
An animal cell has a cellular membrane, which keeps its contents inside, differentiating the inside from the outside. A plant cell has both a cellular membrane and a cell wall, which keeps its shape and prevents it from going through lysis and cellular destruction
tl;dr
Animal cell: cell membrane
Plant cell: cell wall, cell membrane
ACT GCA TTA- what is the complementary DNA strand?
Large volcanic eruptions can sometimes lead to a decrease in the
amount of life on Earth. Please describe how volcanic discharge can lead
to this decrease in biodiversity. (Hint: What does a Volcano erupting do to
the area surrounding it? Kills plant and animal life?)
answer ASAP please
Answer:
Plants are destroyed over a wide area, during an eruption . ... Aquatic life can be affected by an increase in acidity, increased turbidity, change in temperature, ...
Explanation:
hopefully its right!
No two species can occupy the same niche in the same habitat at the same time
a. because of the interactions that shape the ecosystem.
b. unless the species require different abiotic factors.
because of the competitive exclusion principle.
d. unless the species require different biotic factors.
When creating a graph why is an appropriate tittle for a graph important
Answer:
Because when they look at the graph they look at the title to figure out what the graph is showing
Explanation:
please help answer the question depicted above
(the subject is earth science)
What is the smallest living organism on Earth?
Answer:
Nanoarchaeum equitans
Explanation:
i hope this help
The select the complementary DNA strand for the strand provided-AACTCGGAT
-GGTCTAAGC
or
-TTGAGCCTA
or
-AACTCGGAT
or
-CCAGATTCG
Answer:
TTGAGCCTA
Explanation:
A is paired with T and C is paired with G, so switch each gene with it opposite
Species in a symbiotic relationship have evolved interdependence upon one another. Which is true about symbiosis?
A The species in a symbiotic relationship must live in the same area.
В The species in a symbiotic relationship must live on land.
Answer:
b is your answer
Explanation:
3. What are the advantages of using renewable energy sources to generate electricity?
a. Chemicals are released into the atmosphere.
b. It is expensive to maintain energy facilities.
c. It is produced by sustainable substances.
d. They are much less expensive than nonrenewable energy sources.
Is vaping a positive or negative feedback?
taking nicotine over and over is a _____ feedback loop.
After a long period of withdrawal your brain will reduce the receptors on your neurons back to how they were before addiction. This is an example of ____ feedback loop.
Answer: I think Negative?
Explanation:
in a prokaryotic cell most ribosomes are
Answer:
floating freely in the cytoplasm.
Explanation:
If a plant with chlorosis is unable to perform photosynthesis, what products (include
BOTH) are not being made?
Answer:
Glucose and oxygen
Explanation:
Photosynthesis is the process by which the cells of green plants synthesize their own food in the presence of sunlight. Although photosynthesis consists of various steps, it generally combines carbon dioxide (CO2) and water (H2O) to produce glucose (sugar) and oxygen gas (O2). The equation is as follows:
6CO2 (g) + 6H20 (l) → C6H12O6 (aq) + 6O2(g)
In a plant that possess chlorosis (a condition characterized by yellowing of leaves due to lack of chlorophyll), photosynthesis will not occur. This ultimately means that the photosynthetic products such as GLUCOSE AND OXYGEN WILL NOT BE MADE.
Why are Acacia Trees dependent on Giraffes?
Answer:
One study found the growth of acacia trees depended on herbivores. When the trees were protected from herbivores, including the giraffe, they produced less nectar. It turns out they this nectar provided food for ants who defended them from pests like wood-boring beetles. Also Giraffe's eat the tree seeds and when they defecate the seeds fall into new places, growing more trees.
Explanation:
Select the correct answer from the drop-down menu. The lunar eclipse occurs during the _______ phase. A.new Moon B.full Moon C.first-quarter Moon D.last-quarter Moon
Answer:
B. full moon
Explanation:
A solar eclipse occurs in the daytime at new moon, when the Moon is between Earth and the Sun, while a lunar eclipse occurs at night at full moon, when Earth passes between the Sun and the Moon.
Can I get Brainliest? TYSMMMMMMMMMMMMMMM
Answer:
the correct answer is . B
Explanation:
Which two structures produce energy that cells can
use?
O A and B
OB and C
O Cand D
O D and A
Answer:
According to the plant cell scheme, the two structures that produce energy that cells can use are D, which corresponds to mitochondria, and A, which is a chloroplast, so the answer is D and A (fourth option).
Explanation:
In the plant cell —unlike the animal cell— there are organelles called chloroplasts, responsible for converting light energy from the sun into chemical energy. In addition, there are mitochondria, which also provide useful energy to the cell.
In the chloroplast, photosynthesis takes place, a process that during the light phase produces ATP and NADPH⁺ from solar energy. In the mitochondria, energy in the form of ATP is obtained from glucose, due to oxidative phosphorylation and the electron transport chain.The organelles indicated in the diagram are mitochondria (A) and chloroplast (D), both responsible for producing energy for the plant cell.
Answer: D and A
Explanation:
An incoming ray of light strikes the surface of a calm pool of water. Which letter below indicates the
reflected ray of light?
If I'm correct its W ....
WILL MARK BRAINLIEST!!!! Can someone help me with this question?
What observations did scientists make when they collected and dissected rockfish?
Answer:
Rockfish larvae are pelagic, there is genetic evidence for limited dispersal within Puget Sound for the quillback and copper (S. caurinus) rockfish (Seeb 1998) as well as for differentiation from coastal populations of brown rockfish (S. auriculatus) (Buonaccorsi et al. 2002). This degree of population structure is consistent with other genetic and otolith studies from coastal Pacific rockfish populations
Answer:
Rockfish larvae are pelagic
Explanation:
Which part of the cell theory most aligns with the process of Mitosis?
Answer:
cell division
cell division
In which phase of mitosis does the nuclear envelope disappear, chromosomes become visible, and centrioles begin to form mitotic spindles?
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
gases involved in photosynthesis of a plant and their roles
atmospheric oxygen- expelled as a waste product from the plant conducting photosynthesis, carbon dioxide- taken into the plant to go through photosynthesis and is used to make glucose.
Explanation:
Help it's 7th grade science
Answer:
general practitioner
Explanation:
A nephrologist generally sees patients who are referred by their primary care physicians or general physicians for problems related to the kidneys
For rats, black (B) is dominant over white (b), and short hair (L) is
dominant over long hair (). A heterozygous black, short hair female is
crossed with a white, short hair male. What is the probability of the
offspring to have black, short hair?
2/16
4/16
6/16
9/16
Answer:6/16
Explanation:the probability of a offspring to have black hair chances are 6/16