Very small and very large human newborns are less likely to survive than those born at an intermediate weight due to
____.
a. sexual selection
b. artificial selection
c. disruptive selection
d. directional selection
e. stabilizing selection
ANSWER: e
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Based on the evolutionary tree, which letter represents the common ancestor of all
eukaryotes?
a. A b. B c. C d. D
The Krebs cycle occurs where?
a. chloroplasts b. cytoplasm c. mitochondria d. Golgi apparatus
Which of the following molecules are able to cut DNA molecules at specific sequences?
a. assembly enzymes b. hydrolytic enzymes c. restriction enzymes d. ligase enzymes e. repair enzymes
Eukaryotic and prokaryotic organisms differ in how they process genetic information. Which statements best explain one of these differences?
A. In prokaryotes, translation occurs before genes are transcribed into mRNA. In eukaryotes, genes are transcribed into mRNA that is then translated into polypeptides. B. In prokaryotes, introns are removed before genes are transcribed into mRNA. In eukaryotes, introns are removed after genes are transcribed into mRNA. C. In prokaryotes, translation of the mRNA begins before transcription is complete. In eukaryotes, transcription and modification of the mRNA is completed before translation begins. D. In prokaryotes, genes are transcribed directly into polypeptides. In eukaryotes, genes are transcribed into RNA that is used to assemble polypeptides.