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Elenna [48]
3 years ago
15

A zebra cell is just about to replicate its DNA. Which of the following will happen first?

Biology
1 answer:
Rom4ik [11]3 years ago
4 0
C.) T<span>he DNA unravels to make two strands </span>
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Why are cells so important for organisms?
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Cells are the basic structur of all living organisms

Explanation:

i was told

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What is photosynthesis​
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Photosynthesis is a process when the plants is absorbing sunlight to use the sunlight to make energy for them.

Photosynthesis equation :

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3 years ago
Some amino acids are both glucogenic and ketogenic. Explain the difference between the two types and why some amino acids can be
vesna_86 [32]

Answer:

From the point of view of the type of molecule that is obtained after the degradation of the hydrocarbon skeleton, amino acids can be classified as: glucogenic and ketogenic. The main difference between glucogenic amino acids and ketogenic amino acids is that glucogenic amino acids can be converted to pyruvate or other glucose precursors, while ketogenic amino acids can be converted to acetyl CoA and acetoacetylCoA.

Explanation:

Glucogenic amino acids are amino acids that break down to pyruvate, alpha-ketoglutarate, succinyl Co-A, fumarate, and oxaloacetate and are so named because the synthesis of glucose from these molecules is feasible. Both pyruvate and the Krebs cycle intermediates noted above can be converted to phosphoenolpyruvate and subsequently glucose through gluconeogenesis.Ketogenic amino acids are the amino acids that generate acetyl-CoA or acetacetyl-CoA and are called by this name because they can cause ketone bodies. Since mammals lack the proper enzyme system, these compounds can never be used as precursors for glucose biosynthesis. Of the twenty universal amino acids, fourteen are purely glucogenic and two are purely ketogenic (leucine and lysine). The remaining four (isoleucine, phenylalanine, tryptophan and tyrosine) are glucogenic and ketogenic simultaneously since a part of the hydrocarbon skeleton originates precursors for the biosynthesis of glucose (pyruvate or Krebs cycle intermediates) and the other part acetyl-CoA or acetacetyl -CoA.

5 0
3 years ago
Phineas has a tomato plant. The plant adds water to the atmosphere through
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The definition of transpiration is "<em>the process by which moisture(water) is given off through plant leaves as water vapor.</em>"

The plant's leaves give off water in the form of water vapor, so the answer is transpiration.
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