Which of the regions of the ribosome accepts charged tRNA molecules during the elongation phase of
translation?
a. the A site (aminoacyl site)
b. first the A site (aminoacyl site) and then the E site (exit site)
c. the P site (peptidyl site)
d. first the A site (aminoacyl site) and then the P site (peptidyl site)
e. the E site (exit site)
A
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Light entering a human eye travels through structures in this order:
A. cornea, aqueous humor, pupil, lens, vitreous humor, retina. B. sclera, cornea, lens, aqueous humor, iris, vitreous humor, retina. C. aqueous humor, iris, pupil, lens, vitreous humor, retina. D. lens, cornea, vitreous humor, pupil, iris, aqueous humor, retina.
Which of the following choices represents the
correct sequence? a. microspores >>> meiosis >>> gametophyte >>> sperm b. meiosis >>> microspores >>> gametophyte >>> sperm c. gametophyte >>> meiosis >>> megaspores >>> eggs d. meiosis >>> gametophyte >>> megaspores >>> eggs e. gametophyte >>> mitosis >>> megaspores >>> eggs
Use of double mutants has been invaluable in studying developmental pathways. In C. elegans, sex is determined by the ratio of sets of autosomes to X chromosomes. A diploid male has one X, and diploid hermaphrodites have two X's
The loss-of-function gene her-1 produces XO worms that are hermaphrodites, but XX worms are unaffected. Mutation of a second gene, tra, causes the XX to develop as male. Given this information, what would be the phenotype of a tra, her-1 double mutant? A) a male nematode B) a female nematode C) a hermaphrodite D) an intersex variant E) lethality
The organs that produce the gametes (egg or sperm) are called ________
Fill in the blank(s) with correct word