A strictly fermentative bacterium produces energy
A) by glycolysis only.
B) by aerobic respiration only.
C) by fermentation or aerobic respiration.
D) only in the absence of oxygen.
E) only in the presence of oxygen.
A
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Single-celled Paramecium live in pond water (a hypotonic environment). They have a structural feature, a contractile vacuole, which enables them to osmoregulate
If you observed them in the following solutions, at which sucrose concentration (in millimolars, mM) would you expect the contractile vacuole to be most active? A) 0.0 mM sucrose B) 0.05 mM saline C) 0.08 mM sucrose D) 1.0 mM saline
Which one of the following statements about RNA is correct?
A. RNA is a more stable molecule than DNA. B. RNA has the same 5-carbon sugars as DNA. C. RNA uses the same pyrimidine bases as DNA. D. RNA uses the same purine bases as DNA. E. All of these choices are correct.
A change in the sequence of a gene is referred to as a(n) ____
Answer for this statement please? Thank you.
Which of the following types of selection favors the survival of individuals with the intermediate phenotype?
A. Disruptive selection B. Stabilizing selection C. Directional selection