What type of protein is being activated by the G1/S cyclin-CDK complex to promote the expression of histone proteins?
A. a synthase
B. a polymerase
C. a helicase
D. a transcription factor
D
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A complex consisting of a single mRNA molecule with several ribosomes is called a
A. multisome. B. proteosome. C. maxisome. D. polysome.
The reasoning behind the use of fecal transplants from healthy individuals is:
A. the competition from the introduction of other bacteria into the gastrointestinal tract keeps C. difficile numbers down. B. the fecal matter from healthy patients does not have C. difficile. C. C. difficile feeds on other bacteria that are introduced with the fecal transplant. D. antibiotics are administered with the fecal transplant, thus controlling populations of C. difficile.
The specific region of antigen to which an antibody can bind (via its hypervariable regions) is called a(n) ____
Fill in the blank with the appropriate word.
The northern elephant seal was hunted almost to extinction during the 18th and 19th centuries. Less than 100 seals were left to contribute to the gene pool of their future generations. Since the early 20th century, the elephant seals have been protected by law in both the U.S. and Mexico. Over 100,000 seals now inhabit the western shores of North America, all related to the small population that survived the slaughter of hunters.Scientists fear the elephant seals may be more susceptible to disease and pollution due to
A. founder effect. B. disruptive selection. C. heterozygous advantage. D. bottleneck effect.