What supplies most of the energy for processes and activities in living cells?
a. ATP
b. RNA
c. DNA
d. Mitochondria
a
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“Prebiotic soup” refers to ____
a. the interior contents of protocells b. the cytoplasm of early prokaryotic cells c. the mix of gases in the atmosphere that gave rise to the first organic molecules d. the polymerized slime coating ancient clay particles e. the accumulation of organic molecules that formed in the oceans before there was life on Earth
The electron transfer chain is located
a. on the inner membrane of the mitochondria. b. on the inner membrane of the chloroplasts. c. in the fluid part of the chloroplast. d. throughout the cytoplasm of the cell. e. on the plasma membrane of eukaryotes
How does heat affect a DNA duplex? It causes:
a. the two strands to anneal. b. double-stranded breaks. c. denaturation. d. hybridization. e. mutations.
Horses and tapirs have a common ancestor, but now look very different. Horses now are grassland animals adapted for grazing on grass and shrubs. Tapirs are jungle animals that live in dense forests and eat fruit, leaves, and aquatic vegetation. Which of the following led to the development of such differences in the two species?
A. selective breeding B. convergent evolution C. DNA hybridization D. natural selection