The Soviet chemist Oparin suggested that for organic molecules to form on Earth, the atmosphere was probably rich in
A. argon.
B. oxygen and water.
C. hydrogen.
D. oxygen.
E. helium.
C. hydrogen.
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The DNA fragments making up a genomic library are often contained in _____
A) bacterial artificial chromosomes (BACs) B) recombinant viral RNA C) restriction sites D) DNA-RNA hybrids E) radioactive eukaryotic cells
If you had to increase hormonal secretions in a test subject, but you did not want to affect sodium levels, which two hormones could you use?
A. parathyroid hormone and atrial natriuretic peptide B. atrial natriuretic peptide and aldosterone C. aldosterone and cortisol D. atrial natriuretic peptide and cortisol E. antidiuretic hormone and cortisol
When might unrelated individuals engage in apparently altruistic acts?
A. If the altruism is likely to be reciprocated. B. Unrelated individuals never perform apparently altruistic acts. C. If they are unselfish individuals. D. If they are trying to mate with each other. E. If the act benefits their population.
DNA is a double helix, with a structure much like a twisted ladder. What forms the "rungs" of the ladder?
What will be an ideal response?