Red blood cells
a. have a large nucleus when they enter
circulation.
b. do not have a nucleus when they enter
circulation.
c. are the only cells to lack hemoglobin.
d. develop in the yellow marrow.
e. fit more than one of these descriptions
B
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The key gene in mammalian sex determination is
A) the testis-determining factor gene. B) the Y-factor gene. C) the holandric factor gene. D) the X-inactivation center. E) the lyonization gene.
Which of the following statements about monocots is true?
a. They lack sclerenchyma tissue. b. They have a well-developed vascular cambium. c. They do not produce bark. d. Their lateral meristems give rise to wood. e. Secondary growth occurs rather slowly.
Which of the following principles is NOT part of Darwin's theory of evolution by natural selection?
A. Evolution is a gradual process that occurs over long periods of time B. Variation occurs among individuals in a population C. Mutations are the ultimate source of genetic variation D. More individuals are born than will survive E. Individuals that possess the most favorable variations have the best chance of reproducing
What product(s) do plants produce during photosynthesis that is/are used by humans and other animals?
A) oxygen B) glucose and oxygen C) carbon dioxide D) glucose