On which continent are introduced mosquito species absent?
a. Asia
b. North America
c. South America
d. Antarctica
e. Australia
ANSWER: d
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Which of the following contributes to the apparent contradiction that the size of an organism's genome is not directly related to the complexity of the organism? (Choose all that apply)
A. having more than two copies of each chromosome B. a change in the amount of highly repetitive DNA sequences C. a change in the amount of moderately repetitive DNA sequences D. varying susceptibility to viral infection
During the process of ____, blastomeres undergo extensive cellular rearrangements to produce an embryo with three
distinct primary cell layers.
a. induction b. cleavage c. organogenesis d. metamorphosis e. gastrulation
The nitrogenous base found in RNA but not in DNA is
a. adenine. b. cytosine. c. guanine. d. uracil. e. thymine.
Which of the following can cross a biological membrane by simple diffusion?
a. Glucose b. Fatty acid c. Amino acid d. Protein