A bacterial genus that is found in large numbers in the intestinal tract of breast-fed infants is
A. Escherichia.
B. Bifidobacteria.
C. Bacteroides.
D. Doderlein's bacillus.
Answer: B
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In the depiction of the cell cycle in the figure above, what does step 2 represent?
a. a pair of homologous chromosomes in G1. b. two chromosomes in anaphase. c. a pair of duplicated homologous chromosomes in G2 d. the entire genome of the organism. e. a chromosome in telophase.
What is the importance of the Miller-Urey experiment?
a. It showed that molecules crucial to life could be produced biotically. b. It showed that molecules crucial to life could be produced abiotically. c. It showed that molecules not crucial to life could be produced biotically. d. It showed that molecules not crucial to life could be produced abiotically
Reverse transcriptase is associated with which of the following?
A) dsDNA viruses B) +ssRNA viruses C) -ssRNA viruses D) retroviruses E) dsRNA viruses
Which type of tissue covers body surfaces and lines body cavities?
A. connective tissue B. muscular tissue C. nervous tissue D. vascular tissue E. epithelial tissue