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.
Answer: D
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Which letter in the accompanying figure represents the ovary in which haploid germ cells form by meiosis and gametes
form when these cells divide by mitosis? a. A only b. B only c. C only d. D only e. both A and D
The E test is ________.
A. a rapid serological test used to detect the presence of eastern equine encephalitis virus in cerebrospinal fluid B. used to quantify levels of IgE antibody in serum samples C. a quantitative antibiotic sensitivity test that utilizes plastic strips impregnated with an antibiotic of interest D. used to measure esculine levels in pasteurized milk
The differentiation of the sex of an embryo
A. occurs about month 4 of fetal development. B. is determined by the presence or absence of the Y-chromosome and its genes. C. occurs at conception. D. is highly variable from one embryo to another.
The DNA in linear eukaryotic chromosomes is wrapped around proteins called _____________, which keep the DNA from getting tangled and enable an orderly, tight, and efficient packing of the DNA inside the cell.
a. histones b. histamines c. telomeres d. ribosomes e. centromeres