Which of the following is a correct comparison between RNA polymerase holoenzyme that functions in transcription and the primase enzyme that functions in DNA replication?
A. Both enzymes are bound by sigma factor.
B. Both enzymes are composed of RNA.
C. Both enzymes synthesize RNA.
D. Both enzymes synthesize DNA.
Answer: C
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"Seeds" of ancient lycophytes (existing over 300 million years ago) had which of the following characteristics? Select all correct choices
A. a haploid (1n) female gametophyte B. a diploid (2n) embryo C. a storage area for haploid (1n) male gametes D. a seed coat
The site-specific recombinases are similar to topoisomerases in what way?
A. They introduce supercoils. B. They require ATP hydrolysis for their activity. C. They promote phosphoryl group transfers in which the net change in free energy is close to zero. D. They also assist in compaction of the DNA. E. They mediate strand invasion reactions.
Which of the following represents acclimation?
A) Deeper beaks evolve in a population. B) Marine lionfish are able to tolerate freshwater in estuaries. C) Tropical trees grow taller than temperate ones to compete for light. D) Poisonous animals are brightly colored to ward off predators.
Which organisms contain prokaryotic histonlike proteins?
a. Archaea b. Mercaria c. Eukarya d. Bacteria