Which of the following regions of the genome is the least likely to be conserved over evolutionary time?
(a) the upstream regulatory region of a gene that encodes the region conferring tissue specificity
(b) the upstream regulatory region of a gene that binds to RNA polymerase
(c) the portion of the genome that codes for proteins
(d) the portion of the genome that codes for RNAs that are not translated into protein
(a)
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Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
A) lytic phages B) proviruses C) viroids D) bacteriophages E) retroviruses
What is the negative water pressure in the xylem of a plant?
A) torsion B) cohesion C) adhesion D) tension
The function of the epididymis is to:
a. secrete an alkaline fluid that neutralizes the acids of the vagina. b. produce a nutritive fluid for the sperm. c. provide a place for maturation and storage of sperm. d. secrete mucus that lubricates the penis. e. maintain sperm at a low body temperature.
In the mechanism of action for auxin, after auxin binds with its receptor, which of the following happens next?
a. Proteins are targeted for destruction. b. Genes are activated. c. Ubiquitin attaches to repressor proteins. d. Transcription occurs. e. The cell wall loosens