How long does it take for the primary immune response to kick in after the first exposure to an antigen?
a. 2 weeks
b. 3 - 4 days
c. 2 months
d. 6 weeks
e. 12 hours
a
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Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate. The activity of hexokinase is suppressed by glucose 6-phosphate, which binds to hexokinase at a location that is distinct from the active site. This is an example of.
A. feedback inhibition. B. competitive inhibition. C. cofactor binding. D. allosteric activation.
The process of cytoplasmic division is known as
(a) meiosis. (b) cytokinesis. (c) mitosis. (d) fission.
The acrosome of a sperm cell contains ____
a. a haploid number of chromosomes b. a diploid number of chromosomes c. enzymes and other proteins
d. mitochondria e. ATP
Water can maintain a constant temperature better than some other liquids because _____
1.hydrogen bonding keeps the water molecules from moving around too much 2.cohesion forms a seal that keeps heat out 3.heat is generated by ions and there are few ions in water 4.covalent bonds remove energy from the system and keep water cool