Today, the western Asia population of Siberian tigers is
a. doing fine.
b. threatened.
c. endangered.
d. extinct.
D
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Which of the following atoms cannot participate in biological hydrogen bonds?
A. nitrogen B. oxygen C. carbon D. both nitrogen and oxygen E. both oxygen and carbon
Which of the following carries amino acids to
ribosomes, where amino acids are linked into the primary structure of a polypeptide? a. mRNA b. tRNA c. hnRNA d. rRNA e. all of these
Plasma cells
A. secrete cytokines. B. kill infected cells. C. mature in the thymus. D. produce antibodies. E. remain present in the body at low levels after an infection.
Cancer is a disease of enhanced proliferation and cell survival. DNA repair mechanisms are normally important for cell survival. When a cell senses DNA damage, the cell cycle is inhibited until the damage is fixed
Given the importance of DNA repair mechanisms, how can their failure lead to the production of cancer cells with a competitive advantage over normal cells?