The 50S subunit has peptidyl transferase activity. What does this activity catalyze?
What will be an ideal response?
Ans: It catalyzes formation of the peptide bond whereby the amino group of the amino acid on the tRNA at the A site attacks the carbonyl group of the last amino acid of the polypeptide attached to the tRNA at the P site, transferring the polypeptide to the tRNA at the at the A site.
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Flattened sacs of internal membranes associated with photosynthesis are called
A. chloroplasts. B. photosystems. C. the stroma. D. thylakoids. E. cristae.
Gene A occurs on chromosome 5, gene B is on chromosome 21. Therefore, these two parts of the
chromosomes CANNOT be a. genes. b. dominant. c. loci. d. alleles. e. recessive.
In generalized transduction, a phage introduces a segment of donor DNA into the recipient cell. This is followed by recombination of the donor fragment with the recipient chromosome. Which of the following must occur?
A) circularization of the donor fragment before recombination B) a pair (or even number) of crossovers between the donor segment and the recipient C) degradation of one of the two strands of phage genome D) replication of the donor segment before recombination E) a single crossover between the donor segment and the recipient chromosome
Which structure of the reproductive system is treated as needing special protection during hemorrhage, much like the brain or heart?
A. Testes B. Placenta C. Vas deferens D. Prostate E. Ovaries F. Uterus