RNA molecules can both carry genetic information and be catalytic. This supports the proposal that
a) free nucleotides would not have been necessary ingredients in the synthesis of new RNA molecules.
b) protobionts had an RNA membrane.
c) RNA is a polymer of amino acids.
d) RNA was the first hereditary information.
e) RNA could make energy.
Answer: d) RNA was the first hereditary information.
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In the flower diagram shown above, the item labeled "5" is the
a. receptacle. b. ovule. c. style. d. stigma. e. anther.
Which of the following is not a symptom of Down syndrome?
A. flat face B. short stature C. eyelid fold D. indeterminate genitalia E. stubby fingers
The distribution of social animals is likely to be
a. clumped. b. random. c. uniform. d. constant. e. homogeneous.
A butterfly-shaped rash on the face is usually a symptom of
a. anaphylactic shock. b. rheumatoid arthritis. c. type 1 diabetes. d. type 2 diabetes. e. systemic lupus erythematosis.