The answer is a because i took it on k12
Answer:
Cyclins
Explanation:
Cycling regulates the cell cycle only when they are tightly bound to the Cdks.
In certain areas of Africa, the sickle cell mutation has a high frequency because it confers an adaptive advantage against malaria which is endemic to this region.
<h3>What is natural selection?</h3>
Natural selection is a mechanism that drives evolution in natural populations, which in case we are observing stabilizing selection because it acts to stabilize the frequency of different alleles.
In certain regions in the African continent, the sickle cell mutation exhibits a high frequency since it is able to confer resistance against malaria which is an endemic disease located in this region.
Therefore, with this data, we can see that stabilizing selection acts to increase the frequency of the sickle cell mutation, which is harmful in regions where malaria is not endemic but increased in certain parts of Africa due to the incidence of malaria, thereby being an adaptive trait for these geographic areas.
Learn more about stabilizing selection here:
brainly.com/question/8563440
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<span>The correct answer is: picks up and delivers hydrogens (H+) to acceptors.</span>
<span>NAD is a coenzyme which is involved in redox reactions. It is found in two forms in cells: NAD+ which is an oxidizing form and NADH which is reduced form. NAD+ is an important carrier of hydrogen and electrons and its essential role is in the production of energy (ATP) by the mitochondria through the electron transport chain.</span>
