All arteries, with the exception of the __________, contain oxygen-rich blood
a. aorta
b. carotid arteries
c. coronary arteries
d. pulmonary arteries
e. mesenteric arteries
D
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How many genetically different children could your parents have produced with their combinations of gametes?
A) 46 B) 285 C) 8 million D) 64 trillion
Small Aristelliger lizards have difficulty defending territories, but large lizards are more likely to be preyed upon by owls. Which kind of selection acts on the adult body size of these lizards?
A. Stabilizing selection B. Directional selection C. Disruptive selection
Which of the following statements concerning transcription in bacteria is FALSE?
A) It occurs in the nucleoid region. B) Sigma factors are parts of RNA polymerase that recognize promoter regions. C) Different RNA polymerases are required for synthesis of mRNA, rRNA, and tRNA. D) Termination is either self-induced or due to the presence of Rho protein. E) There are a variety of sigma factors that affect transcription.
The naturally occurring helium atom is chemically inert because:
A) its outermost shell is filled with electrons. B) it has all of the shared electrons it could ever have. C) it has the most protons that it could ever carry. D) its nucleus is filled with two neutrons.