The enzyme beta-galactosidase acts on lactose to form galactose. In turn, the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose. In this case, lactose is serving as a carbon source and as a(n)
A. repressor.
B. operon.
C. inducer.
D. DNA-binding protein.
Answer: C
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Four of the following features are important evolutionary advancements in the evolution of the tree-dwelling primates
Which one is the exception? a. grasping hands and feet b. depth perception c. well-developed sense of smell d. the ability to see in 3D e. a large brain relative to body size
Muscle fibers are ____ when you are looking at something far away
Fill in the blank(s) with the appropriate word(s).
Which of the following WBCs are NOT lymphocytes?
A) cytotoxic T cells B) helper T cells C) NK cells D) M cells E) B cells
This organism commonly contaminates grains, corn, and peanuts and produces a potent mycotoxin called aflatoxin:
A. Pneumocystis (carinii) jiroveci B. Geotrichum candidum C. Fusarium species D. Aspergillus flavus E. Rhizopus species