Which feature of a plasmid cloning vector is necessary for the plasmid to be replicated inside a host cell?
a. lacZ+ gene
b. ampicillin resistance gene
c. origin of replication
d. ribosomal binding site
e. restriction site
ANSWER: c
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The array of potential antibodies to the variety of possible antigens is amazing. Which statement explains this development?
A. Recombination of genes coding for the variable regions of immunoglobulins occurs during the developmental stage of lymphocyte production. B. The existing antibody molecules change their shapes, allowing them to fit with a large number of antigens. C. There is a shuffling of genes that code for self markers as well as nonself markers, mixing them together and producing reactive lymphocytes to those markers. D. Mutations in the antibody gene occur within the activated B cells, since they meet the antigen.
The risk for kidney stones increases in individuals who have a diet high in ________. a. proteins b. All of these choices
c. cellulose d. fats e. carbohydrates
In both sexes, which of the following glands monitors and causes the release of hormones that control reproductive organ development and functioning?
a. pituitary gland b. Sertoli gland c. hypothalamus d. pancreas
The structure that separates epithelial tissue from the underlying supporting tissue is the ____
a. duct system b. cytoskeleton c. free epithelial surface d. basement membrane e. plasma membrane