Liver cells, mammary cells, and skin cells all contain the same genome; however, their respective proteomes vary drastically. This observation is best explained by what phenomenon?
A. cell division
B. crossing over
C. evolution
D. gene splicing
E. cell differentiation
Answer: E
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Match the essential nutrient category with the probable effects a deficiency might cause.
1. Muscle loss, weakened immune system. 2. Hair loss, dry skin. 3. Muscle weakness, weight loss. a. Fats b. Carbohydrates c. Proteins
An activated TH cell produces ________, which is a growth factor for T helper cells and cytotoxic T cells.
A. complement B. antiserum C. interleukin-12 D. interleukin-2 E. interleukin-1
In the absence of tryptophan, __________
A) the inactive repressor cannot bind trpO, so operon gene transcription occurs B) the active repressor binds trpP, so operon gene transcription is repressed C) the inducer cannot bind trpO, so operon gene transcription occurs D) the active repressor cannot bind trpO, so operon gene transcription is attenuated E) the repressor binds the corepressor, and operon gene transcription occurs
A population of lizards lives in a rocky area next to a desert. Some lizards are light colored and blend into the sand. Others are dark and blend into the rocks. What is likely to happen to this population of lizards over time?
A. They may remain one species as a result of stabilizing selection. B. They may remain one species as a result of directional selection. C. They may remain one species as a result of disruptive selection. D. They may evolve into two separate species as a result of disruptive selection. E. They may evolve into two separate species as a result of directional selection.