Which of the following parts of an amino acid vary among different amino acids?
A. the carboxyl group
B. the side chain, or R group
C. the amino group
D. the hydrogen on the central carbon
Ans: B. the side chain, or R group
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During glycolysis, glucose molecules are broken down by breaking the carbon-hydrogen bonds that are present and
forming carbon-oxygen bonds. In this process, glucose is ____.
a. partially oxidized b. partially reduced c. completely oxidized d. completely reduced e. hydrolyzed
__________ species of many plants (and a few
animals) originated by chromosome doublings and hybridizations. Fill in the blank(s) with the appropriate word(s).
Adult tunicates resemble __________ and are __________
a. eels; carnivorous. b. corals; photosynthetic c. starfish; carnivorous d. sponges; filter feeders e. earthworms; detritivores
What is the primary purpose of a fruit?
A. to feed the growing embryo of the plant B. to reward animals for pollination C. to distract predators from the main plant D. to disseminate seeds