Norton Zinder and Joshua Lederberg discovered transduction in experiments with ____
a. Escherichia coli
b. Neurospora
c. Aspergillus
d. Salmonella typhimurium
e. Streptococcus pneumoniae
ANSWER: d
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Regulatory proteins
A) are influenced by small molecules. B) bind to specific DNA sites. C) regulate transcription. D) regulate transcription, bind specific DNA sites, and can be influenced by small molecules.
Recall that the bullhorn acacia forms a symbiosis with P. ferruginea ants. A researcher takes an acacia seed and plants it in an area without P. ferruginea. What will happen to this acacia plant?
A. It will immediately form a symbiotic relationship with ants native to the area. B. It will begin producing alkaloids and terpenes to deter herbivores. C. It will begin to produce hairs on its leaves to deter herbivores. D. Without P. ferruginea, the plant won't form any new defenses and will be eaten by herbivores.
Which enzyme forms peptide bonds between adjacent amino acids during polypeptide synthesis?
A) RNA polymerase B) phosphotransferase C) peptidyl transferase D) ribonuclease
Water absorption depends primarily on
a. abscisic acid. b. cohesion-tension. c. the concentration gradient between soil and root. d. active transport. e. the potassium pump.