If there are 20 chromatids in a cell, how many centromeres are there?
A) 10
B) 20
C) 30
D) 40
E) 80
Answer: B
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Some research has indicated that increased exercise is linked to increased telomere length in renewable tissues, like
blood. Assuming that telomerase levels are not increased by exercise, what might explain the increase in telomere length?
a. DNA replication occurred more frequently in individuals who exercised. b. Cell division occurred more rapidly in individuals who exercised. c. Telomerase activity was higher in individuals who exercised. d. Telomerase activity was lower in individuals who exercised. e. Fewer DNA replication errors occurred in individuals who exercised.
An Olympic marathon runner probably has
more __ than does an Olympic weight lifter.
a. white muscle fibers b. red muscle fibers c. creatine phosphate d. stored ATP e. oxygen
Research on the aging process shows that wounds of the elderly heal more slowly and that they are more susceptible to disease. These are problems associated with an aging ________ system
A) respiratory B) immune C) integumentary D) digestive E) endocrine
What is the name of the general mechanism of fungal reproduction?
a. conidia b. spores c. asci d. fruiting bodies