The period following an action potential during which a neuron cannot be stimulated to generate another action potential is referred to as
A. the resting period.
B. the refractory period.
C. the critical period.
D. the threshold period.
E. the inactivation period.
Answer: B
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How does the cell overcome inhibition from irreversible inhibitors?
a. by binding a second inhibitor, which forces the enzyme's conformation to dislodge the first inhibitor b. by phosphorylating the enzyme, altering the enzyme's conformation to dislodge the inhibitor c. by altering the cellular pH, which will decrease the bonding between the enzyme and the inhibitor d. by degrading the enzyme-inhibitor complex and generating new enzyme e. by upregulating the expression of other enzymes with similar catalytic functions
As the human body grows to trillions of cells, DNA replication occurs about how many times?
A) one billion. B) three trillion. C) 100 trillion. D) 100 quadrillion.
Pseudocoelomate nematodes lack a body cavity.
A. Correct, they are solid from the gut to the cuticle. B. Incorrect, their body cavity is fully enclosed by ectoderm but is a functional body cavity. C. Incorrect, although not fully enclosed by mesoderm, the pseudocoel is a body cavity. D. Correct, their pseudocoel does not allow for the development and expansion of organs.
What is the process of eating up a cell by another cell called?
A. Phagocytosis B. Complement Fixation C. Apoptosis D. Mitosis E. Meiosis