Which of the following statements is true of reptiles?
A. Eggs undergo external fertilization.
B. Sperm are released in the vicinity of the female.
C. Eggs have an amnion and a chorion.
D. Larvae become adults by metamorphosis.
E. Embryonic and fetal development in all species is only by oviparity.
C. Eggs have an amnion and a chorion.
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An individual who avoids light is exhibiting
(a) negative phototaxis. (b) positive geotaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
The procedure developed by the Chinese to protect against smallpox was called
A. Oriental poxination. B. humoral immunity. C. variolation. D. naturally acquired immunity.
Which of the following relationships about nucleotide composition in DNA is TRUE?
A. C G=A T. B. C A=G T. C. C=A. D. G=T. E. C=T.
What is the main idea behind the model of a molecular clock?
a. that neutral mutations accumulate at a steady rate b. that certain traits are under the pressure of natural selection c. that segments of DNA can be compared with segments of RNA d. that phenotypes, not genotypes, are affected by natural selection