Stem cells ____
a. have the property of self-renewal by division
b. are the least likely to give rise to cancer
c. do not have the ability to divide
d. are immature cells that become nerve tissue susceptible to cancer
e. are found only in cancerous tumors
a
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The intercellular spaces between plant cells
(a) contain air. (b) are responsible for cytoplasmic streaming. (c) produce energy for the cell. (d) contain chloroplasts.
What is the function of a protein kinase?
A. To remove phosphate groups from proteins B. To cleave membrane phospholipids C. To phosphorylate GDP to generate GTP D. To add phosphate groups onto proteins
Protease inhibitors:a
inhibit the action of reverse transcriptase. b. are glycoproteins found in saliva. c. result in viral copies that cannot infect new cells. d. can cure AIDS patients. e. destroy helper T cells.
Which of the following statements regarding the process of speciation is correct?
(A) Speciation occurs so slowly that scientists have never observed the emergence of a new species (B) Speciation only occurs slowly as small genetic changes accumulate from generation to generation (C) Speciation can occur as a result of changes in a single gene (D) Speciation requires the geographic isolation of a small population from a larger parent population