A human male diploid cell has which sex chromosome combination?
a. XX
b. XY
c. YY
d. X
e. Y
ANSWER: b
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Which of the following is likely NOT to be a mechanism for controlling hormone levels in the blood?
A. Alter the rate of synthesis and subsequent release of hormone into the blood. B. Change the rate at which an enzyme produces the hormone. C. Modify the structure of the hormone at its point of production so it no longer binds its receptor. D. Alter the rate at which the hormone is removed from the blood. E. Change the rate at which the hormone is excreted into the urine.
What role do bees play in the interaction between cowbirds and oropendola birds?
a. keep away large predators b. keep away insect pests c. pollinate species that only cowbirds prefer d. pollinate species that only oropendola birds prefer e. have no effect on the relationship between cowbirds and oropendolas
An individual with a genetic makeup of aa BB
is called a. true-breeding. b. recessive. c. hybrid. d. dihybrid. e. heterozygous.
Which of the following best describes the culture of science and how scientists work?
A. Scientists commonly repeat other scientists' experiments to verify their work. B. Scientists attempt to prove their hypotheses. C. Scientists commonly make subjective conclusions in their work. D. Scientists develop hypotheses based solely on their own observations.