Stress can have a significant effect on the body. Chronic stress
a. may lead to excessive stimulation of neurons.
b. is associated with elevated levels of epinephrine from the adrenal cortex.
c. is associated with elevated levels of cortisol from the adrenal cortex.
d. may lead to increased blood flow to the brain, especially the hippocampus.
e. may suppress stimulation of neurons.
C
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The enzyme nitrogenase is irreversibly inhibited by excess
a. O2. b. NO3 ?. c. N2. d. CO2. e. NH4 +.
The two types of bonding found in a DNA molecule are _____
a. ionic and covalent b. covalent and peptide c. ionic and hydrogen d. peptide and hydrogen e. covalent and hydrogen
Upon fertilization, the egg and sperm fuse to form a single cell called a(n) ________
A) zygote B) gamete C) embryo D) gonad
Pseudocoelomate nematodes lack a body cavity.
A. Incorrect; their body cavity is fully enclosed by ectoderm but is a functional body cavity. B. Correct; they are solid from the gut to the cuticle. 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.