In selection, individuals with two or more extreme fit phenotypes and selects against the intermediate phenotype.
A. convergent
B. disruptive
C. stabilizing
D. directive
E. artificial
B. disruptive
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In a cell-mediated immune response, how does a helper T cell activate cytotoxic T cells?
a. antibodies b. cytokine signaling c. receptor signaling d. via cross-talk with macrophages e. neural signaling
Which of the following four statements is NOT
true? a. The location of the centromere is unique for each chromosome. b. Some spindle fibers become attached to kinetochores. c. The spindle apparatus is composed of protein molecules of tubulin. d. Some microtubules overlap at the spindle equator. e. All of these are NOT true
Which one of the following events associated with the transmission of an impulse across a synapse occurs last?
A) Action potential arrives at an axon bulb. B) Neurotransmitter is released into the synaptic cleft. C) Chemically gated channels for sodium open. D) Calcium diffuses into an axon bulb. E) Neurotransmitter binds to receptors on the postsynaptic membrane.
Suppose that extra fingers and toes are caused by a recessive trait, but it appears in only 80% of homozygous recessive individuals. Two heterozygotes conceive a child. What is the probability that this child will have extra fingers and toes?
A. 15% B. 5% C. 20% D. 10% E. 25%