The column of water extending in tubes from plant roots to leaves is maintained by ____
a. hydrophilic interactions
b. ionic bonds
c. covalent bonds
d. hydrophobic interactions
e. cohesion between water molecules
ANSWER: e
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Sperm are produced in the
a. testes. b. vas deferens. c. epididymis. d. prostate gland. e. penis.
How is the 4-letter language of nucleic acids converted into the 20-word language of amino acids?
a. The 4 nucleic acid bases combine in 2-letter combinations that define different amino acids. b. The 4 nucleic acid bases combine in 3-letter sequences that define different amino acids. c. Triplets of the 2-letter nucleic acid bases are translated into the 20 different amino acids. d. The 4 bases each specify 1 amino acid, which give rise to the remaining 16 amino acids. e. The 4 bases are first converted into tRNA molecules, which can each attach to 5 amino acids.
The approximate age of the Earth is:
a. 100,000 years. b. 1.2 billion years. c. 4.6 billion years. d. 10.5 billion years. e. 13.6 billion years.
Cancer is the number one cause of death in the US.
a. true b. false