The wings of a bird and the front legs of a dog are
a) vestigial structures
b) homologous structures
c) acquired characteristics
d) analogous structures
Ans: b) homologous structures
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Some proteins that bind to DNA block transcription, whereas other proteins can activate transcription
Indicate whether the statement is true or false.
The metabolic diversity of photosynthetic bacteria stems from different
A) bacteriochlorophylls and pigments they contain. B) chlorophylls they can have and organic compounds they can produce. C) light-harvesting complexes, electron donors, and organic compounds they produce. D) unrelated taxa capable of photosynthesis.
Which of the following refers to the flow of hydrogen ions across the mitochondrial membrane?
a. Chemiosmosis b. Diffusion c. Citric acid cycle d. Oxidative phosphorylation
All of the following bases are found in RNA molecules EXCEPT
A. adenine. B. thymine. C. uracil. D. cytosine. E. guanine.