Which biochemical reaction is catalyzed by a ribozyme?
A. RNA polymerization during transcription in prokaryotes
B. DNA polymerization during DNA replication
C. peptide bond formation in protein synthesis
D. RNA polymerization during transcription in eukaryotes
E. peptide bond hydrolysis by proteases
Ans: C. peptide bond formation in protein synthesis
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Through studies of insect Malpighian tubules, researchers found that K+ accumulated on the inner face of the tubule, against its concentration gradient. What can you infer about the mechanism of transport?
A) Potassium transport is a passive process. B) Movement of potassium into the lumen of the Malpighian tubules is an energy-requiring process. C) Potassium moves out of the tubules at a faster rate than it moves into the lumen of the tubules. D) Sodium ions will follow potassium ions.
A nucleic acid contains uracil, allowing you to conclude that:
A. this nucleic acid is DNA. B. this nucleic acid is RNA. C. this nucleic acid could be either DNA or RNA.
What is true of the corpus luteum?
A. Secretions of the corpus luteum stimulate LH and FSH secretion. B. Secretions of the corpus luteum prepare the uterus for implantation of the embryo. C. Secretions of the corpus luteum induce maturation of primary oocytes. D. The major hormone secreted from the corpus luteum is estradiol. E. The major hormone secreted from the corpus luteum is LH.
What occurs during exhalation?
a. Oxygen is taken in through the nasal cavity. b. Oxygen is released back into the air. c. Carbon dioxide is released back into the air. d. Carbon dioxide is taken in through the nasal cavity.