Which of the following toxins produced by Bordetella pertussis results in the accumulation of excess mucus in the trachea?

A. pertussis toxin
B. adenylate cyclase toxin
C. tracheal cytotoxin
D. both adenylate cyclase toxin and tracheal cytotoxin
E. both pertussis toxin and adenylate cyclase toxin


Answer: E

Biology & Microbiology

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The pentose sugars found in DNA and RNA differ in which of the following ways?

A. The ribose in RNA lacks a hydroxyl group on the 2' carbon. B. The deoxyribose in DNA has a hydroxyl group in the 2' position but not the 3'. C. Both sugars have 5 carbons and form 5-membered rings, but ribose has an oxygen in the ring and deoxyribose does not. D. Both sugars have "puckered" rings but differ in which carbon lies outside of the plane of the rest of the ring atoms. E. The ribose in RNA attaches to the nitrogenous base through the 2' carbon, whereas the deoxyribose attaches to the base through the 1' carbon.

Biology & Microbiology

If an organism has five pairs of chromosomes, how many chromosomal combinations are possible at metaphase I of meiosis?

A. 52 B. 105 C. 510 D. 25 E. None of the answers are correct

Biology & Microbiology

Another name for a chromosome is a _______, since it contains genes that are often inherited together

A. linkage group B. crossing over group C. genetic recombinant D. bivalent

Biology & Microbiology

Approximately what percent of the total number of plant species have had their genomes partially or

fully sequenced?

a. 0.01% d. 10% b. 0.10% e. 50% c. 1%

Biology & Microbiology