Food moves along the digestive tract as the result of contractions by _____
A) cardiac muscle
B) smooth muscle
C) voluntary muscle
D) striated muscle
E) skeletal muscle
Answer: B
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In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-phosphoglycerate is
A) phosphoglycerokinase. B) ribulose bisphosphate carboxylase/oxygenase (rubisco). C) triose phosphate isomerase. D) phosphoribulokinase. E) glyceraldehyde-3-phosphate dehydrogenase.
In which of the following groups does seaweed belong?
a. protists b. plants c. fungi d. archaea e. bacteria
Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon. B. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon. C. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon. D. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon.
Catalytic proteins are known as ________ whereas catalytic RNA molecules are known as ________.
A. ribozymes; enzymes B. enzymes; catalozymes C. enzymes; ribozymes D. catalozymes; ribozymes