What would be most likely to occur if one of a man's testicles failed to descend (drop into the scrotum)?
A. The pH of his semen would be higher than normal.
B. Gonadotropins within the undescended testicle would be inactivated.
C. He would have a lower than normal sperm count.
D. He would be unable to undergo spermatogenesis.
E. He would have exaggerated secondary sex characteristics.
C. He would have a lower than normal sperm count.
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The term that Darwin used to describe the concept that those with superior physical, behavior or other attributes are more likely to survive than those that are not so well endowed, and thus are more likely to pass their traits to the next generation, is called:
A. geometric progression B. natural selection C. superior beings D. survival of modifications E. biological diversity
Molting in arthropods involves primarily a change in:
a. sex b. body size c. eating habits d. sensory structures e. larval to adult stages
Which one of the following is TRUE regarding fossils?
A) Fossils are more likely discovered under the sea than on land. B) Even though fossils from more than 200,000 different species have been found, the fossil record remains incomplete. C) Because organisms are primarily composed of soft tissue, it is more likely that soft tissue is fossilized than hard tissue. D) Once fossilization is complete, no further degradation of the fossil can occur. E) Because fossils are so old, it is not possible to determine their age.
The antidiuretic hormone (ADH) is regulated by negative feedback. Which of the following statements is correct about ADH regulation?
A) A high blood concentration of ADH will make you feel thirsty. B) A high blood concentration of ADH will cause you to excrete dilute urine. C) Drinking a lot of water will increase the rate of ADH production. D) A high blood concentration of ADH will increase the rate of ADH production. E) Loss of water from your bloodstream will limit further production of ADH.