Compared with eukaryotic chromosomes, bacterial chromosomes are ________
A) large, mainly organized in single-gene transcription units without introns
B) large, triple-helix, Z-DNA, organized in single gene units with introns
C) small, mainly organized in single-gene transcription units with introns
D) large, mainly organized in polygenic transcription units without introns
E) small, with high gene density
Answer: E
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A transgene is best described as
A. hard to destroy once inserted into a genome. B. hard to study because of its transposons. C. created by several of the DNA motifs. D. an inserted foreign gene. E. a result of endosymbiosis.
Sequencing the entire human genome
a. helps to identify genes that are essential in the defense system of the human body. b. allows for the study human genetic diseases. c. can distinguish absolutely between individuals. d. allows for comparisons with other species. e. does all of these
“D” shows the entry of the __________ into the
__________. a. superior vena cava; left atrium b. inferior vena cava; right atrium c. pulmonary arteries; left atrium d. pulmonary veins; left atrium e. coronary arteries; aorta
During the process of gas exchange, gases move ____
a. by active transport b. down electrical gradients c. through membrane channels d. by facilitated diffusion e. down partial pressure gradients