All viruses have
a. DNA and protein.
b. RNA and protein.
c. DNA and either RNA or protein.
d. protein and either RNA or DNA.
e. RNA and either DNA or protein.
D; Viruses are genes in a protein coat. The genes can be either RNA or DNA, but viruses use one or the other to convey information.
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Long term responses rather than immediate
behavioral responses are induced by a. alarm signals. b. signaling pheromones. c. sex attractants. d. priming pheromones. e. all of these.
Pauling used gel electrophoresis to confirm that homozygous individuals produce a single form of ?-globin protein that differs depending on the homozygous genotype as well as that heterozygotes produce proteins of both types in approximately equal
concentration. What characteristic(s) of the bands proved this? A) the positions of the protein bands B) the densitometry peaks of each band C) the shape of each band D) both the positions and the densitometry peaks of each band (both A and B) E) both the shape and the position of each band (both A and C)
Which microscope uses an opaque disk to block light that would enter the objective lens directly?
a) Fluorescence microscope b) Phase-contrast microscope c) Darkfield microscope d) Confocal microscope
Which of the following limits the use of PCR to detect and isolate genes?
(a) The sequence at the beginning and end of the DNA to be amplified must be known. (b) It also produces large numbers of copies of sequences beyond the 5? or 3? end of the desired sequence. (c) It cannot be used to amplify cDNAs or mRNAs. (d) It will amplify only sequences present in multiple copies in the DNA sample.