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liraira [26]
3 years ago
10

What was happening in history when this mutation took off in parts of Europe and Africa?

Biology
1 answer:
Sergio039 [100]3 years ago
8 0

Answer:seventy-seven thousand years ago, a craftsman sat in a cave in a limestone cliff overlooking the rocky coast of what is now the Indian Ocean. It was a beautiful spot, a workshop with a glorious natural picture window, cooled by a sea breeze in summer, warmed by a small fire in winter. The sandy cliff top above was covered with a white-flowering shrub that one distant day would be known as blombos and give this place the name Blombos Cave.

Explanation:

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Select ALL of the following that are directly used to control fatty acid oxidation in cells.
Serjik [45]

Answer:

The correct statements are A negative feed back regulation if free fatty acid accumulate C targeting the acetyl CoA transport shuttle in the mitochondrial membrane

Explanation:

The beta oxidation of fatty acid can be regulated by several following ways.

A The accumulation of free fatty acids exerts negative feedback during beta oxidation of fatty acids.As oxidation of fatty acids result in the breakdown of complex fatty acids in free fatty acids and acetyl CoA,the accumulation of free fatty acids lowers the rate of beta oxidation of fatty acid.

C The targeting of end  product of beta oxidation that is acetyl CoA to the mitochondrial membrane also regulates the beta oxidation pathway.Because more the transport of acetyl CoA to the mitochondrial membrane more will be the rate of fatty acid break down by beta oxidation.

6 0
3 years ago
Pls help!!!
quester [9]

Answer:

The answer to this question is dogs.

8 0
3 years ago
Read 2 more answers
The ____ ring is built onto ribose-5-phosphate of PRPP for its de-novo nucleotide biosynthesis, while the ring structure of the
maxonik [38]

Answer:

The purine ring is built onto ribose-5-phosphate of PRPP for its de-novo nucleotide biosynthesis, while the ring structure of the pyrimidine bases are synthesized separately and then coupled to ribose-5-phosphate via the C-N glycosidic bond.

Explanation:

In the de novo synthesis of nucleotides, their metabolic precursors such as aminoacids, ribose-5-phosphate, CO₂ and NH₃ are used as starting materials.

In purine  nucleotide synthesis, the ring structure is built up on ribose-5-phosphate of PRPP by addition of one or a few atoms one at a time starting with the amino group donated by glutamine until the first intermediate inosinate is synthesized.

In pyrimidine ring synthesis, orotate is first synthesized from carbamoyl phosphate and aspartate, and then is attached to ribose-5-phosphate of PRPP, before it is then converted to the common pyrimidine nucleotides starting from uridylate.

6 0
4 years ago
Muscle cell activity increases and ATP decreases below the set-point, a sensor molecule detects low ATP and activates protein ki
sergeinik [125]

Answer: Feedback mechanism

Explanation:

Feedback mechanism is the body's way of maintaining physiologic processes in the body. These physiologic processes include maintaining homeostasis, production of energy, hormones as well as enzymes required for chemical reactions.

There are 2 types of feedback mechanism:

  1. Positive feedback: The stimulus (message) sent to the brain, produces prolonged increased production or increased activity in the body.
  2. Negative feedback: In negative feedback, the stimulus causes production, secretion or activity till a set point where the body knows it has taken enough. This causes a self termination of the process.

In the increased muscle activity, the increase in activity in turn causes a decrease in energy (ATP) and serves as the stimulus leading to the release of enzymes which in turn lead to increased absorption of glucose which will be used by the body to produce more ATP needed for the muscular activity. At the end of the muscular activity, the body recognizes that it doesn't need an increased absorption of glucose to support increased activity anymore and glucose absorption normalizes.

7 0
3 years ago
A cell with 12 chromosomes undergoes mitosis and cytokinesis. How many daughter cells are produced and how many chromosomes are
KIM [24]
2 daughter cells, 12 chromosomes each
mitosis maintains diploid number, only meiosis becomes haploid (half number of chromosomes)
6 0
3 years ago
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