You (assume you are male) were told by your mom not to wear tight briefs, as this could make you sterile and infertile. What did she mean by this statement?
A) Testosterone does not act at body temperature.
B) Testosterone cannot be produced at body temperature.
C) Sperm production is reduced by excess pressure.
D) Sperm production is reduced at body temperature.
D
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Immunodiffusion tests
A. allow detection of specific antigens. B. are a simple method that produces visible results in the zone of optimal proportion. C. allow quantitation of antigen concentrations. D. All of the choices are correct.
The energy to form the new bonds between nucleotides in a growing DNA strand is provided primarily by ____
a. unwinding of the DNA double helix b. hydrolysis of pyrophosphate c. breaking hydrogen bonds between base pairs d. DNA helicase e. forming hydrogen bonds between base pairs
In humans, an X-linked disorder called coloboma iridia (a fissure in the iris) is a recessive trait. A
normal couple has an afflicted daughter. The husband sues the wife for divorce on the grounds of infidelity. Would you vote in his favor? What will be an ideal response?
The same gene that causes various coat patterns in wild and domesticated cats also causes the cross -eyed condition in these cats, the cross-eyed condition being slightly maladaptive. In a hypothetical environment, the coat pattern that is associated with crossed eyes is highly adaptive, with the result that both the coat pattern and the cross-eyed condition increase in a feline population over time. Which statement is supported by these observations?
A) Evolution is progressive and tends toward a more perfect population. B) Phenotype is often the result of compromise. C) Natural selection reduces the frequency of maladaptive genes in populations over the course of time. D) Polygenic inheritance is generally maladaptive, and should become less common in future generations. E) In all environments, coat pattern is a more important survival factor than is eye-muscle tone.