The Hayflick limit describes ____
a. the size limit to which a cell can grow
b. the number of divisions a cultured cell can undergo
c. the largest number of chromosomes an organism can possess
d. the most cells an organism can have
e. how rapidly DNA replication can occur
b
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In 1986, a nuclear power accident in Chernobyl, USSR (now Ukraine), led to high radiation levels for miles surrounding the plant. The high levels of radiation caused elevated mutation rates in the surviving organisms, and evolutionary biologists have been
studying rodent populations in the Chernobyl area ever since. Based on your understanding of evolutionary mechanisms, which of the following most likely occurred in the rodent populations following the accident? A) Mutations caused major changes in rodent physiology over time. B) Mutation led to increased genetic variation. C) Mutation caused genetic drift and decreased fitness. D) Mutation caused the fixation of new alleles.
The result of natural selection is
A. extinction. B. catastrophism. C. adaptation. D. synthesis. E. behavioral change.
Vascular tissues distribute water and solutes through ground tissue. In ____, water and ions flow through tubes of dead tracheids and vessel elements
a. sclerenchyma b. parenchyma tissue c. ground tissue d. xylem e. phloem
Which of the following is not an autosomal recessive disorder?
A. sickle-cell disease B. Marfan syndrome C. cystic fibrosis D. Tay-Sachs disease E. All are autosomal recessive disorders.