If all conditions of Hardy–Weinberg equilibrium are met,
(a) allele frequencies move closer to each generation.
(b) allele frequencies change in the direction predicted by natural selection.
(c) allele frequencies stay the same.
(d) all allele frequencies increase.
(c) allele frequencies stay the same.
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When experimentally applying alpha-bungarotoxin to a muscle, you find that it does not contract when the motor neuron leading to it is electrically stimulated. Knowing that this toxin blocks acetylcholine receptors, what can you conclude about the failure to contract?
A. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction. B. A contraction fails to occur because this toxin prevents cross-bridge formation and thereby directly prevents contraction. C. A contraction fails to occur because an action potential is not generated in the muscle cell. D. A contraction fails to occur because this toxin directly prevents calcium ion release from intracellular stores. E. A contraction fails to occur because acetylcholine is not released from the motor neuron.
Pinocytosis and phagocytosis are accomplished in the cell by the ____
a. nucleus b. lysosome c. endoplasmic reticulum d. plasma membrane e. mitochondria
As the population of a predator increases, the
A) population of the prey species decreases. B) birthrate of the prey species increases. C) mortality rate of the prey species decreases. D) proportion of the prey population that is captured and consumed decreases.
The disorder ________ is a complication of systemic infections with Streptococcus in which antigen-antibody complexes form in the blood and get trapped in the kidneys
A) cystitis B) glomerulonephritis C) pyelonephritis D) leptospirosis E) urethritis