What is the hypothesis of the "RNA world?"
What will be an ideal response?
Ans: The "RNA world" hypothesis is that RNA may have originally been the molecule with the primary roles of maintaining and expressing genetic information. Even today, RNA is the genetic material for some viruses, and some RNAs have catalytic functions. Many of the functions that RNA may once have had are now fulfilled by DNA (genetic information storage) and proteins (catalysis).
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A neurologist diagnosis a patient with damage to the hippocampus. This observation is consistent with the difficulties the patient reports with
A. forming memories of recent events. B. effectively coordinating movements once initiated. C. planning movements. D. maintaining a steady and regular heartbeat. E. perceiving tactile stimulation from different regions of their body.
If it is true that potato plants use uncoupling proteins (UCPs) in a similar way as mammals, one would
expect the following in these plants:
a. increased amounts of ATP production. b. decreased sugar metabolism. c. increased internal tissue temperature. d. decreased mitochondrial catabolism. e. increased cytosolic pH.
Which of the following organisms would most likely produce asexually?
A. a worker honeybee B. a lizard in an equatorial desert C. a mammal in a temperate forest D. a bird in an urban environment
From the left ventricle, oxygen-rich blood flows through the
A) superior vena cava. B) aorta. C) pulmonary artery. D) pulmonary vein.