A trinucleotide repeat refers to:
A) a nucleotide that is made of three subunits: a sugar, a phosphate, and a nitrogenous base.
B) the same nucleotide repeating three times in a row.
C) a nucleotide that contains three bases.
D) a sequence of three nucleotides that repeats and can be involved in genetic diseases.
Answer: D
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The topoisomerase DNA gyrase will introduce negative supercoils into DNA. What effect will this enzyme have on relaxed, covalently closed DNA?
A. The linking number will increase. B. The DNA will become overwound. C. The treated DNA will migrate farther in an agarose gel than the relaxed DNA. D. The linking number will become undefined. E. The relaxed DNA will migrate farther in an agarose gel than the treated DNA.
In the F2 generation, how many genotypic classes could be generated from a dihybrid cross of two heterozygotes in which the genes involved show complete dominance?
A) 3 B) 4 C) 8 D) 9 E) 12
Sea cucumbers will __________ when environmental conditions deteriorate
a. eject their digestive tract, respiratory structures, and gonads. b. crawl to an area with more favorable conditions. c. form a resistant spore. d. float to the surface and then later drop to a more favorable location. e. crawl deep into the ocean mud on the bottom.
The second shell in an atom contains ________ orbitals and holds up to ________ electrons.
A. 4; 8 B. 4; 4 C. 8; 24 D. 3; 2 E. 3; 8