When the peptide bond is created between amino acid 1 and amino acid 2:
A. the amino group of amino acid 1 is joined to the carboxyl group of amino acid 2.
B. the carboxyl group of amino acid 1 is joined to the amino group of amino acid 2.
C. the carboxyl group of amino acid 1 is joined to the carboxyl group of amino acid 2.
D. the amino group of amino acid 1 is joined to the amino group of amino acid 2.
Answer: B
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K+ channels in the heart do not have binding sites for ACh, yet parasympathetic release of ACh causes outward flux of K+ from heart cells. How does this occur?
A. ACh triggers release of epinephrine from the adrenal glands, which in turn causes K+ flux out of heart cells. B. ACh binds to a G-protein coupled receptor on heart cells, and the G protein alpha subunit binds to a separate K+ channel and causes it to open. C. Parasympathetic neurons activate sympathetic neurons, which directly cause K+ flux from heart cells. D. ACh binds and activates a K+ pump on heart cells.
The maximum number of tRNAs that can be on one
ribosome at one time is a. 2. b. 3. c. 43 . d. unlimited. e. unknown.
The role of the antenna complex in a photosystem is to
A. capture photons from sunlight. B. transfer excited electrons to the primary electron acceptor. C. generate glucose. D. generate NADPH.
How many molecules of ATP are needed to reduce one molecule of carbon dioxide to carbohydrate by oxygenic phototrophs during the dark reactions of photosynthesis?
A. 3 B. 2 C. 10-12 D. 4