An amino acid contains all of the following except
A. a carbon atom.
B. an amino group.
C. a carboxyl group.
D. a variable R group.
E. a nitrogenous base.
Answer: E
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Chromosomes exchange genetic information by
A. fertilization. B. mitosis. C. syngamy. D. DNA replication. E. crossing over.
The algal ancestors of land plants are most likely similar to the
a. Rhodophyta. b. Phaeophyta. c. Chrysophyta. d. Charophyta. e. Radiolaria.
You turn on the shower and check the water temperature with your hand. Your brain is able to monitor increasing temperature because the thermosensitive neurons in your skin
A. integrate temperature information. B. transmit bigger action potentials to the brain as the water warms up. C. transmit action potentials to different brain regions as the water warms up. D. transmit action potentials at a greater rate when the water warms up. E. gradually adapt to the stimulus.
The selective advantage linked to the high frequency of the cystic fibrosis allele in Caucasians is:
a. an increased resistance to falciparum malaria. b. the prevention of excessive water loss associated with certain types of diarrhea. c. production of an enzyme to break down cholera toxin. d. increased mucous secretions for the removal of infectious cells. e. an increased probability of Salmonella infection.