What fraction of Earth's surface has been altered by human use?
A) 25%
B) 50%
C) 75%
D) 95%
C
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Both endergonic and exergonic reactions require an input of ____ to begin
a. organic molecules b. initiation energy c. activation energy d. water e. oxygen
Which hormone increases muscle mass?
a. progesterone b. estrogen c. luteinizing hormone d. testosterone e. myostatin
Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain. An endonuclease removes nucleotides ________ while an exonuclease removes nucleotides ________.
A. from the ends of the chain; internally B. internally; from the ends of the chain C. from the 3' end of the chain; from the 5' end of the chain D. from the 5' end of the chain; from the 3' end of the chain
The mesophyll layer of leaves is important to plants because
A. it keeps the plant from drying out. B. it anchors the plant to the soil. C. most of the photosynthesis occurs here. D. most of the water needed for photosynthesis is absorbed here.