Which of the following is true regarding the amniotic egg of snakes, turtles, etc.?
A. Fertilization must take place after the egg
has formed.
B. The egg is impermeable to gases such as
oxygen or carbon dioxide.
C. The egg is vulnerable to desiccation (water
loss).
D. The embryo's nutritional needs are met by
a large yolk or placenta.
D
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Many retroviruses have sequences complementary to the 3' end of the tRNA molecules present in the host cell infected by the virus. What is the purpose of the complementarity?
A. The tRNA acts as a primer for DNA synthesis by reverse transcriptase. B. The tRNA activates the reverse transcriptase. C. The tRNA prevents binding of integrase until after the double-stranded DNA is delivered to the nucleus. D. The tRNA is needed for proper compacting of the RNA genome. E. None of the choices given is correct.
Which of the following gymnosperms have male and female organs that are found on separate plants?
a. conifers b. cycads c. ginkophytes d. gnetophytes
Two animals are considered members of different species if they __________.
Fill in the blank(s) with the appropriate word(s).
The respiratory membrane is a combination of
A) bronchi and air sacs. B) bronchioles and capillary walls. C) alveolar and capillary walls. D) bronchi and bronchioles. E) bronchioles and air sacs.