If the hypothesis that protocells were based on an "RNA world" is correct, what would be necessary to shift to a "DNA world"?
A. an enzyme or reaction capable of removing one oxygen from ribose in nucleotides
B. new enzymes for transcribing DNA back to RNA
C. enzymes for reverse transcription of RNA into DNA
D. new enzymes to replicate the DNA
E. All would be necessary to switch to a "DNA world."
Answer: E
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You can be outside on an day where the air temperature is 85oF for hours without getting cold. However, you will get cold in 85oF water before too long unless you are very active. This difference is due to higher heat _____ in water relative to air.
A. radiation B. conduction C. convection D. evaporation E. transpiration
In cardiac and skeletal muscle vasculature, the distribution of alpha and beta receptors is such that epinephrine will
A) induce a dilation that increases blood flow to these tissues. B) increase skeletal muscle contractility. C) induce a constriction that decreases blood flow to these tissues. D) have no effect on peripheral resistance. E) increase myocardial contractility
A given organism has 46 chromosomes in its karyotype. Therefore, we can conclude that it must _____
A) be human B) be an animal C) reproduce sexually D) have gametes with 23 chromosomes
At which stage of mitosis are chromosomes photographed in the preparation of a karyotype?
A) prophase B) metaphase C) anaphase D) telophase E) interphase