What are the functions of guard cells?
Guard cells control the opening and closing of the stomata in plant cells.
WHAT ARE GUARD CELLS:Guard cells are structures that surrounds the stomata of plant cells and regulates the opening and closing of the stomata. The stomata, which are located on the leaves of plants opens in order for the plant to perform gaseous exchange i.e. intake of CO2 and release of O2.Therefore, Guard cells function to control the opening and closing of the stomata in plant cells.
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the observable traits expressed by an organism are described as its
the observable traits expressed by an organism are described as its phenotype.
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the diagram shows two cells found in human blood.
a. the actual diagram of
red blood cell is 0.007mm ( 7 um) in diameter.
Calculate the magnification of the diagram. show your working.
side note: I measured it in a ruler and it's 2.3 cm = 23 mm (drawn to scale)
a)
Actual diameter = 0.007 mm
Diameter of scaled diagram = 2.3 cm = 23 mm
Formula to use:
Magnification = scaled dimension/actual dimension
Magnification = 23/0.007
Magnification = 3285.714... → x3286
b)
Red blood cells (RBCs), otherwise known as erythrocytes, don't have nuclei and organelles such as mitochondria, are smaller than WBCs and have a biconcave disc shape ideal for purpose
c)
i.
RBCs transport oxygen inhaled into the lungs around the body to all tissues and organs
ii.
RBCs are void of organelles so they are maximally packed with haemoglobin to bind and transport oxygen;
The biconcave disc shape is ideal for flowing through the blood vessels, particularly the capillaries, optimising them for transporting oxygen;
The small size also helps in being able to circulate the vasculature effectively and successfully
a)Actual diameter = 0.007 mm
Diameter of scaled diagram = 2.3 cm = 23 mm
Formula to use:
Magnification = scaled dimension/actual dimension
Magnification = 23/0.007
Magnification = 3285.714... → x3286
b)Red blood cells (RBCs), otherwise known as erythrocytes, don't have nuclei and organelles such as mitochondria, are smaller than WBCs and have a biconcave disc shape ideal for the purpose.
c)i.RBCs transport oxygen inhaled into the lungs around the body to all tissues and organs
ii.RBCs are void of organelles so they are maximally packed with haemoglobin to bind and transport oxygen;
What are RBCs?The biconcave disc shape is ideal for flowing through the blood vessels, particularly the capillaries, optimising them for transporting oxygen;The small size also helps in being able to circulate the vasculature effectively and successfully.
Thus, these are the answer.
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Which layer of the atmosphere is experiencing this storm?
Answer:
Troposphere
Explanation:
Almost all weather occurs in the lowest layer of the atmosphere, called the Troposphere. The exception being large storms like hurricanes and large Thunderstorms. These storms have clouds with great vertical development and the tops of these storms go into the Stratosphere.
What is one way that microorganisms can be beneficial to humans? Question 11 options: Microorganisms cause disease. Microorganisms decompose wood. Microorganisms decompose waste. Microorganisms decay tooth enamel.
Microorganisms decompose waste.
Answer: I’m am pretty sure the answer is microorganisms decompose waste.
Explanation:
True or false: In a typical mammalian adult cell, the M phase takes up a large fraction of the entire cell cycle.
Answer:
True
Explanation:
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Which body system is correctly paired with its function and interaction with the brain?
A. Digestive system; it ensures that toxic materials are not formed in the brain.
B. Skeletal system; it forms a protective structure that surrounds the brain.
C. Muscular system; it helps create energy for brain cells.
D. Excretory system; it eliminates excess carbon dioxide from the brain.
Answer:
B
Explanation:
the skull protects the brain
Semiconservative DNA replication means that
A. each daughter DNA molecule is composed of one original strand and one new strand.
B. the sequence of a DNA molecule is preserved as it is being replicated.
C. each strand of a double-stranded DNA molecule is replicated differently.
D. the cell can proofread its newly synthesized DNA only part of the time.
E. nucleotides are constantly being recycled as cells make DNA.
Semiconservative DNA replication means that each daughter DNA molecule is composed of one original strand and one new strand (Option A). It describes the mechanism of DNA replication.
In semiconservative DNA replication, both DNA strands separate and serve as templates to create new complementary DNA strands.
In consequence, each daughter cell has a molecule of DNA composed of an 'old' DNA template strand and a newly synthesized DNA strand.
The semi-conservative nature of DNA Replication was discovered by Meselson and Stahl.
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why is bromophenol blue added to the individual dna samples?
Answer:
It allows the observer to view how far the DNA samples travel.
Explanation:
It was an answer on a test I just got back.
how are unicellular and multicellular organisms the same
Answer:
Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms include bacteria, protists, and yeast.
Explanation:
hllo baby
good night
Answer:
Okay
Explanation:
Is the cholesterol molecule mostly polar or mostly nonpolar?
Answer:
Most of the cholesterol molecule in non-polar and therefore associations with the non-polar fatty acid tails of the phospholipids. However, the hydroxyl group (-OH) on cholesterol carries a negative charge and therefore associates with the polar environment of water either inside the cell or outside.
Explanation:
Mark me brainly please
Answer:
Cholesterol is very non-polar, except for the hydroxyl group attached to the first ring.
Explanation:
Give TWO reasons why mechanical digestion of food is important! Marking brainliest
Answer:
Mechanical digestion is a purely physical process that does not change the chemical nature of the food. Instead, it makes the food smaller to increase both surface area and mobility. It includes mastication, or chewing, as well as tongue movements that help break food into smaller bits and mix food with saliva.Explanation:
Hlww Xdxdxdxdxdxdxdxdxd
WILL YOU BE MY FRIEND ......
Gender roles and gender stereotypes are
A. the same thing.
B. decided on by individuals.
C. decided on by society.
D. more important than a person's gender identity.
E. Other:
HELP PLEASE! TY
A. How are radio waves used to create radar maps?
B. How does reflectivity help meteorologists figure out the weather shown on
radar maps?
A. These signals have been calibrated against actual visual and location readings for the amount of rain falling and cloud water content.
B. Reflectivity of an object helps indicate the amount of water that a cloud may carry. The stronger the reflected signal from the radar signal sent out, the easier the meteorologist will be able to tell what to expect.
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Water reacts with sodium metal to produce sodium hydroxide and hydrogen
gas, along with heat and light. What are the reactants in this chemical
reaction?
Onion root tips contain cells that are constantly dividing. Why was it important to use the onion roots tips to observe chromosomes during mitosis rather than a cell from another part of the plant?
a. Because cells in the leaves do not have DNA or chromosomes.
b. Because chromosomes only form during mitosis, one part of cell division
c. Because root cells are naturally purple, so you can see the chromosomes
d. Because cells in the leaves only divide, but do not undergo mitosis.
Explanation:
the answer to your question is A
Onion roots are used to see mitosis because of rapid growth at the onion tips and at the stage of mitosis,leaves of the plants has division in the cells but there is no mitosis. the correct answer is option D.
What is the significance of mitosis ?The significance of mitosis is that in the stage the chromosomes are paired and the pairing of this homologous chromosomes makes the chromosomes visible at the equatorial plate.
Leaves do not undergo cell mitosis as they do show the cell division from various types of tissues but the mitosis is absent and the root cells show rapid division in the lateral sides and because of roots being the active site of division, these are considered more to see mitosis happening.
Thus, mitosis being absent in leaves takes the roots to be considered option.
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Some single-celled organisms make copies of themselves through mitosis. Which describes the function of the cell cycle in such single-celled organisms?
Answer:
In unicellular organisms such as bacteria, mitosis is a type of asexual reproduction, making identical copies of a single cell.
Explanation:
Unicellular organisms are asexual which means they don"t need partners.
is there a nutritional difference in brown and white eggs
Answer:
there is no significant difference in nutrients between brown and white eggs.
Cyanidin is a compound that is sensitive to pH. Cyanidin is found in plants such as hydrangeas, cornflowers, and the vegetable rhubarb. Cornflowers are blue because the cornflowers sap is basic and cyanidin turns blue in the presence of bases. Rhubarb contains an acid called oxalic acid. This affects the cyanidin and causes the red color found in rhubarb. Other plants that contain cyanidin are cherries, raspberries, and strawberries. What does the above information infer about cherries, raspberries, and strawberries?
Answer:
their colours are basically on the acidic and basic content of their cell sap in reaction with the cyanidin
True or false: The size and complexity of organisms is directly related to the number of total chromosomes it has. If false, make it a correct statement
I think the answer to this is true, but I'm not really for sure
The energy that cells need to function is
Answer:
adenosine triphosphate (ATP)
Explanation:
<3
which is smaller organ from heart and muscle tissue
Answer:
small instestine...
.
....
A laboratory cat could be made to twitch its whiskers by direct stimulation of the ________ lobes of the cerebral cortex.
4. What are the four components of the Earth system?
Lithosphere (land), hydrosphere (water), biosphere (living things), and atmosphere (air)
where is the inherited information that determines a cell’s function?
Answer:
Genes
Explanation:
The hereditary information (inherited information) is contained in genes, located in the chromosomes of each cell.
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- Heather
The place where a group of organisms lives is called the ___________. The combination of the community and habitat is called the ___________.
Answer:
the first blank is biodiversity. I think like that
The place where a group of organisms lives is called the habitat. The combination of the community and habitat is called the ecosystem.
What is habitat and ecosystem?An ecosystem is basically the neighborhood where animal lives. The habitat is the animal's address in that neighborhood. Some animals can survive in more than one habitat. Other animals are limited to certain habitats. For example, moose habitat is more specific than gray squirrel habit.
Moreover, ecosystem is defined as the interrelationships between the biotic and abiotic component of the environment. Whereas habitat is defined as the natural environment in which a particular species of plants and animals lives.
Therefore, a habitat is a place where an organism makes its home. A habitat meets all the environmental conditions an organism needs to survive. For an animal, that means everything it needs to find and gather food, select a mate, and successfully reproduce.
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The fertilization of an oocyte by more than one spermatozoon which results in embryo death is known as
Answer:
Monospermy and Physiological Polyspermy. In general, the entry of more than two spermatozoa into the egg cytoplasm, referred to as polyspermy, causes aberrant effects on meiosis completion or embryo development and hence embryonic death, due mainly to excess male centrosomes delivered into the egg.
Explanation:
Differentiate How
does telophase II differ from
telophase I?
Answer: Telophase I is the ending phase of the first division of meiosis which would split the parent cell into two daughter cells while telophase II is the ending phase of the second division of meiosis which would split the two daughter cell into four daughter cells and resulting in the end of the process.
What are the three sections of the female part of the flower called?
a) style, stamen, and pollen
b) stamen, ovary, and pollen
0 ) anther, pollen, and filament
d) stigma, style, and ovary
Answer:
D
Explanation:
Answer:
D
Explanation: