Teosinte, a wild relative of corn, was crossed with domestic corn in an attempt to produce a ____ variety
a. herbicide resistant
b. pest resistant
c. high lysine
d. perennial
e. higher yielding
ANSWER: d
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What component of amino acid structure varies among different amino acids?
A) the long carbon-hydrogen tails of the molecule B) the presence of a central C atom C) the components of the R-group D) the glycerol molecule that forms the backbone of the amino acid
Which of the following hormones is INCORRECTLY paired with its target tissue?
a. prolactin ? mammary glands b. growth hormone ? bone c. calcitonin ? bone d. aldosterone ? uterus e. pancreas ? liver
Which line, A, B, C, or D, points to tracheids and vessels in xylem?
1.A
2.B
3.C
4.D
The integumentary system functions in
a. protection. b. support. c. covering. d. contraction. e. resistance.