Which RNA molecule carries the sequence of nucleotides that determines the order of amino acids in a protein?
A) transfer RNA
B) ribosomal RNA
C) messenger RNA
D) translator RNA
C
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AMP-activated protein kinase (AMPK) is an enzyme that is activated by high levels of AMP in cells. If levels of AMP are high in cells, that means that levels of ATP are low. Once active, AMPK activates catabolic pathways and inhibits anabolic pathways in the cell. Why do you think that is the case? Choose the answer that best explains the role of AMPK
A. High levels of AMP indicate that there is a high amount of energy stored in the cell, thus activating catabolic pathways and inhibiting anabolic pathways are mechanisms to use stored energy. B. By inhibiting anabolic pathways, AMPK provides a mechanism to generate heat for the cell, which is important if AMP levels are high in the cell. C. By activating catabolic pathways, AMPK provides a mechanism to activate exergonic pathways, which is important if AMP levels are high in the cell. D. Activating catabolic pathways and inhibiting anabolic pathways will ultimately lead to higher consumption of ATP, which is important if AMP levels are high in the cell.
How could the decline of the population of anchovies off Peru preclude a future rebound in this population in and of itself even if, in the future, there was enough food in the water to support the growth of large populations of anchovies?
What will be an ideal response?
Mutations in genes that affect __________ may cause morphological shifts in a lineage. Fill in the blank(s) with the appropriate word(s)
Damage to its flagellum would prevent a choanocyte from
A. circulating water through the sponge. B. secreting spongin to form the sponge body. C. producing the supportive spicules. D. stinging and capturing prey.