Which is an example of negative feedback?
A. TRH stimulates the anterior pituitary to release thyroid-stimulating hormone.
B. FSH and LH stimulate the gonads to produce sperm or eggs.
C. When the blood becomes dilute, ADH is no longer released from the hypothalamus.
D. Uterine stretching sends nerve impulses to the hypothalamus that releases oxytocin that stimulates uterine contraction.
E. Nursing action stimulates the hypothalamus to release oxytocin that triggers mammary gland milk production.
Answer: C
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Match the following items to the correct phrase.
_______1. Viruses that infect bacteria and cause the lytic cycle to occur. _______2. Term meaning complete viral particles. _______3. Are known to cause some plant diseases, but no animal diseases. _______4. Infectious protein molecules. _______5. Infectious molecules of RNA. _______6. Cause diseases such as Creutzfeldt-Jacob disease, “mad cow disease,” and “scrapie.” a. viroids b. virions c. prions d. temperate phages e. virulent phages
Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,
a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called
a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.
Bat-pollinated, night-blooming flowers would most likely display which two characteristics?
a. blue petals and sticky pollen grains b. yellow petals and the scent of rotting flesh c. orange petals and no scent d. white petals and a strongly sweet scent e. red petals and sticky pollen grains
A substance that diffuses across a cell membrane tends to move _______.
a) toward the area where it is more concentrated b) away from the area where it is less concentrated c) none of the choices is correct d) away from the area where it is more concentrated