A person who inherited the allele combination aa is ____
a. homozygous dominant
b. homozygous recessive
c. heterozygous
d. codominant
e. dominant
ANSWER: b
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Refer to the figure above. Which of the structures in the figure causes the two strands of DNA to separate?
A) A B) B C) C D) D
The “ruling reptiles”
a. dominated the land for 125 million years. b. coexisted with ichthyosaurs. c. coexisted with turtles and tuataras. d. lost many lineages in a mass extinction that ended the Jurassic. e. did all of these.
Which substance is cycled between organic matter and abiotic reservoirs?
A) fat B) carbon C) protein D) nucleic acid
Calcium ions are normally in higher concentrations outside most living cells than within cells. Which of the following processes is most likely responsible for this condition?
A) active transport B) facilitated diffusion C) osmosis D) simple diffusion