Which of the following illustrates viviparity?
a. A mare gives birth to a live colt
b. A snake lays an egg right before it hatches
c. A chicken lays an undeveloped egg
d. A frog’s eggs are fertilized outside the body
a. A mare gives birth to a live colt
A mare gives birth to a live colt illustrates viviparity.
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Which characteristic possessed by Archaeopteryx was least likely present in their dinosaurian ancestors?
a. teeth b. feathers c. a long tail with many vertebrae d. three clawed fingers on each hand e. a forked breastbone
Escherichia coli biochemical studies have added immeasurably to:
a. the definition of genes. b. the definition of gene activities. c. the identification of biochemical pathways. d. all of these e. none of these
Antigen receptors are capable of producing large diversity due to the fact that there are __________
cassettes (versions) of each __________. Fill in the blank(s) with the appropriate word(s).
The major function of the protonephridia in the flatworm is to:
a. conserve water. b. conserve salts. c. eliminate waste materials such as ammonia and urea. d. eliminate excess water. e. regulate the pH of the gastrovascular cavity.