Homologous structures, such as a bat wing and dolphin flipper,
A) are structures that did not develop in response to natural selection.
B) are formed from genes on the same pair of chromosomes.
C) are the result of pairs of chromosomes that are identical in bats and whales.
D) have the same underlying structure due to inheritance from a common ancestor.
E) are similar externally but have different basic structures and were probably not
derived from a common ancestor.
Ans: D) have the same underlying structure due to inheritance from a common ancestor.
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The ATP synthase complex in the thylakoid membrane
A) contains an embedded CF1 component and a protruding CFo component. B) is identical to the FoF1 complex of mitochondria. C) performs photophosphorylation in oxygenic phototrophs. D) contains an assembly of hydrophobic polypeptides that function in ATP synthesis. E) all of the above
In which choice are the entries listed from smallest to largest?
A) DNA building block - gene - chromosome - genome B) DNA building block - RNA building block - protein C) Gene - cell - DNA - genome D) Chromosome - genome - cell - DNA building block
Hansen's disease is caused by which of the following?
A. Mycobacterium tuberculosis B. Mycobacterium bovis C. Mycobacterium avium D. Mycobacterium leprae
Four of the following statement about protocells are true. Which statement is false?
a. They are simple membrane-bound sacs. b. They contain DNA. c. They are able to engage in metabolism. d. They are able to reproduce. e. They are able to capture energy.