In some genetically engineered tomatoes, fruit ripening was delayed by crippling the gene that produces which hormone?
A. auxin
B. ethylene
C. abscisic acid
D. gibberellin
E. cytokinin
B. ethylene
An antisense copy of the gene for ethylene biosynthesis prevents the formation of ethylene and subsequent ripening of transgenic fruit. The antisense strand is complementary to the sequence for the ethylene biosynthesis gene. After transcription, the antisense mRNA pairs with the sense mRNA, and the double-stranded mRNA cannot be translated into a functional protein. Ethylene is not produced, and the fruit does not ripen.
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What will be an ideal response?
Mitosis begins with which phase?
a. prophase b. metaphase c. anaphase d. telophase e. cytokinesis
Which of the following has the lowest pressure?
A) Capillaries B) Veins C) Arterioles D) Venules E) Arteries
Inhaling aerosols of dried bodily fluids from infected animals may result in
A. tularemia. B. salmonellosis. C. Q fever. D. hemolytic uremic syndrome. E. both tularemia and Q fever.