Which of the following is a method of gene amplification that involves complementary primers and uses heat to unzip DNA to make multiple copies of a particular gene?
A) vector
B) polymerase chain reaction
C) sticky ends
D) recombinant
B
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A eusocial animal ______.
A. lives alone B. works alone C. breeds continuously D. lives within a group with a reproductive division of labor E. least likely to exhibit altruistic behavior
Choose the letter of the best match from the following:A. abscisic acidB. trichomesC. aquaporinD. endodermisE. stomaReflects sunlight at leaf surface.
Fill in the blank(s) with the appropriate word(s).
To conserve precious salts, freshwater fish
A) drink large amounts of water and produce small amounts of urine. B) drink almost no water and produce large amounts of dilute urine. C) excrete salt ions and small amounts of urine. D) consume salt ions in food and eliminate water by osmosis.
The ________ is the development of high-yield varieties of crops and the use of modern cultivation methods, including the use of farm machinery, fertilizers, pesticides, and irrigation
Fill in the blank(s) with correct word