Which of the following statements is TRUE with regard to oral herpes?
A) Lesions become more severe with each recurrence.
B) Ninety percent of all cases are caused by human herpesvirus 2 (HHV-2).
C) Lesions can be triggered by emotional stress or physiologic changes.
D) Primary infections are usually characterized by severe lesions.
E) There is an effective cure for oral herpes.
C
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The _______ refers to the genetic composition of an individual
A. character B. genotype C. phenotype D. dominant trait E. recessive trait
What is the distance between these two genes?
You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ b+ b+) and (l+ l b+ b) flies are normal, but (l l b b) flies don't move around very much and cannot detect the location of a light source. You perform a testcross with a doubly heterozygous fruit fly and get the following results: listless, sighted: 100 listless, blind: 400 normal activity:, sighted 400 normal activity:, blind 100 A. They are on different chromosomes. B. They are 10 map units apart. C. They are 20 map units apart. D. They are 40 map units apart. E. They are 80 map units apart.
The olfactory receptors discovered by Richard Axel and Linda Buck are members of a large family of similar receptor molecules termed
A. G-protein coupled receptors. B. ligand-gated ion channels. C. voltage-gated ion channels. D. intracellular receptors. E. serine/threonine proteases.
In Drosophila, germ cells develop from pole nuclei isolated from the rest of the embryo at the posterior end. How are they "protected" from the effects of posterior concentrations of zygote-produced mRNAs and proteins?
A) Their genes have unresponsive promoters. B) The cytoplasm at the pole is separated by a compartmentalizing membrane. C) The pair-rule, gap, and segmentation genes are not expressed in these cells. D) Homeotic genes in these cells are inhibited by zygotic genes from the mother. E) Paternal effects operate on the embryo only in the pole cells.