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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Telomerase activity in stem cells is very low
A. true B. false
In Mendel's crosses the starting plants are referred to as the P generation
1.True 2.False
Inflammation begins when mast cells in tissue release __________, which increases blood flow and
also makes capillaries leaky to phagocytes and plasma proteins. Fill in the blank(s) with the appropriate word(s).
What type of bonding holds together the complementary nitrogenous bases in DNA?
a. Hydrogen bonding b. Phosphate-deoxyribose bonding c. Ionic bonding d. Covalent bonding