Which structure generates the ATP that is required for movement of the sperm's tail?
A) a mitochondrion in the neck and middle piece
B) mitochondria in the sperm tail
C) the sperm plasma membrane
D) the acrosome
Answer: A
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Which of the following is an example of herd immunity?
A) Brucellosis is no longer found in farm animals in the United States. B) If 70% of the population is immunized against polio, the disease will be essentially absent from the population. C) Federal law requires that all cattle not immune to anthrax be destroyed. D) All farm animals used for food must be immunized against all the common agents of disease that infect humans.
According to the above table, what foraging characteristic would benefit an animal most in a stable ecology?
a. A baby garter snake, when it captures and eats a slug b. A sitter, because it would have more trouble adapting to a changing environment c. A rover, because it has the ability to adapt quickly d. Both the sitter and the rover are equally adept in a stable ecosystem. e. Both the snake and the rover are equally adept in a stable ecosystem.
The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade of effects. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are realeased in different concentrations.
A scientist wants to perform a monohybrid cross for stem length in pea plants that will show all possible genotypes in the progeny. Which pea plants will they cross?
What will be an ideal response?