Sites of transcription and therefore most of the genes along the length of the chromosome appear to be found in
A) heterochromatin.
B) euchromatin.
C) constitutive heterochromatin.
D) centromeric regions.
B) euchromatin.
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Which of the following is a likely mechanism for gene dosage compensation?
A. One X chromosome of the female (XX) is inactivated. B. Two X chromosomes of a hermaphradite (XX) are transcribed at one-half the level of the single X chromosome of the male (XO). C. The single X chromosome of the male (XY) is transcribed at twice the level of the X chromosomes of the female (XX). D. All of the choices are correct.
Which gene would most likely be found in the genomes of all present-day organisms?
a. an amino-acyl tRNA synthetase gene b. a photosynthetic gene c. a nitrogen fixation gene d. a gene for anaerobic respiration e. a gene for cellulose breakdown
Tuna are captured commercially using:
a. traps. b. purse seines. c. fishing poles. d. beach seines. e. bottom trawlers.
The luteinizing hormone (LH) ____
a. affects sex steroid hormone secretion b. has no function in males c. is produced by the corpus luteum d. stimulates milk production e. encourages growth of bone and soft tissues