The basic unit in ecology is the
A) ecosystem.
B) gene.
C) individual.
D) species.
C
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Germ layers are:
A. layers infected with bacteria B. embryonic layers with different developmental potentials C. layers of cells surrounding the egg prior to fertilization D. colonial protists arranged in layers E. none of the choices provided
If the thymus fails to develop,
A. functional T cells are absent. B. functional B cells are absent. C. Di George's syndrome exists. D. complement deficiencies exist. E. functional T cells are absent AND Di George's syndrome exists.
When a 5-kb circular plasmid is digested with a restriction enzyme that has three recognition sites on the plasmid, how many bands can be visualized on an agarose gel?
A) 1 B) 2 C) 3 D) 4
Which of the following occurs during initiation of translation?
A. The ribosome moves down one codon so that the A site is available to receive an incoming tRNA. B. One of the three stop codons is reached. C. The ribosome dissociates into its two subunits and falls off the mRNA. D. The mRNA binds to the smaller of the two ribosomal subunits. E. The polypeptide lengthens one amino acid at a time.