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3 years ago

5

A plant cell has a versatile compartment that stores organic nutrients, absorbs water, and contains poisons that protect against

plant-eating animals. this compartment is the _____.

1 answer:

irinina [24]3 years ago

7 0

This is called the central vacuole.

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Which of the following statements about soil formation is true?

Kisachek [45]

B. Precipitation affects the rate at which nutrients are removed from soil.

Soil is known to be a loose mixture of rock fragments, water, organic materials and air that usually accommodate the growth of vegetation. Thus, formation and development of soil is a dynamic process rather than static and soil is present when pre-historic animals roamed the Earth and some these animals are preserved only fossilized soils buried deep beneath our present soil.

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3 years ago

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Dr. Simonson was trying to explain to Justine why her smoking might lead to further health problems. He took out a model of a lu

BigorU [14]

Answer:B.

It was used to prove that smoking causes health problems.

Explanation:

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3 years ago

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Scientists have noticed that the entire DNA molecule has the same width, despite the fact that the four nucleotides are NOT the

const2013 [10]

I don't have access to your model, although I'm sure it's beautiful. Fortunately, this question can be answered without one.

A strand of DNA is a polymer consisting of monomeric nucleotide units. The nucleotides that are found in DNA are distinguished by their nucleobases: adenine (A), thymine (T), guanine (G), and cytosine (C). Each nucleotide in DNA is made up of a single nucleobase, a sugar (deoxyribose), and a phosphate group. These nucleotides form extremely long chains comprising phosphate-sugar linkages (covalent, phosphodiester bonds).

In native, double-stranded DNA, you have of these chains (or strands) arranged side-by-side such that the nucleobases on one chain are faced directly across <em>corresponding nucleobases </em>on the other chain, which enables hydrogen bonding between the bases.

There is a "rule" regarding which bases form hydrogen bonds with one another (Chargaff's rule): adenine with thymine and guanine with cytosine.

What does this have to do with the width of the DNA molecule?

The four nucleotides can be structurally classified into two categories: pyrimidines and purines. For our purposes, we only need to know that pyrimidines are six-membered rings and purines are a fusion of a six- and five-membered ring (basically, purines are pyrimidines attached to a five-membered ring). Thymine and cytosine are pyrimidines, and adenine and guanine are purines.

So, geometrically, adenine and guanine are larger (and, thus, "wider") than thymine and cytosine since adenine and guanine contain an extra ring. But remember our base-pairing rules: In native DNA, adenine (two rings) on one strand pairs up with thymine (one ring) on the other strand, and guanine (two rings) pairs up with cytosine (one ring) on the other strand.

Because there's a 1:1 ratio between A:T and G:C in double-stranded DNA, the DNA molecule consists of complementary base pairs that, in any given composition of, has equivalent widths. Put simply, the A=T pair has the same width as a G≡C pair because both base pairs are between one pyrimidine and one purine.

4 0

3 years ago

Axons of the nervous system are described as afferent and efferent according to the direction in which they carry information. W

Ahat [919]

Answer:

The correct option is b) motor output of the spinal cord

Explanation:

Motor neurons, also called afferent neurons, drive impulses from the brain and spinal cord to the receptors (eg, muscles). They are the motor output component of the spinal cord.

The spinal cord is a cord of nerve tissue that runs inside the spine. It conducts the nerve impulses that arrive from the receptors to the brain, and the responses with the motor orders from the brain to the effector organs. Thus, the brain receives the information and can develop an order that modifies the reflex response given by the spinal cord. A spinal nerve has two nerve roots: a motor and a sensory root. The motor root has nerve fibers that carry signals from the spinal cord, to the muscles to stimulate contraction and produce muscle movements, the fibers are efferent as they leave the medulla to the periphery through the anterior roots of the spinal nerves.

5 0

4 years ago

Explain the cycling of energy between theprocesses of photosynthesis and cellular respiration

Oksana_A [137]

Answer by Mimiwhatsup: Photosynthesis will make the glucose that is used in cellular respiration to make ATP(Adenosine Triphosphate). Then the glucose will be then turned back into carbon dioxide, which is also used in photosynthesis (as it is also in the air from the atmosphere). Then water will be broken down to form oxygen during the photosynthesis process, in the cellular respiration the oxygen is combined with hydrogen to form water.

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3 years ago