Each enzyme has a particular substrate because enzymes
A. have active sites complementary in shape to their substrates.
B. are named for their substrate.
C. decrease the productivity of the cell.
D. always require coenzymes.
E. increase the energy of activation.
Answer: A
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Which of the following statements about telomeres is INCORRECT?
A. Telomeres are produced by telomerase. B. Telomeres are found at the ends of DNA. C. Telomeres are short repeat sequences. D. Telomeres would predominate more in cells of older than younger individuals. E. Telomeres are crucial to the viability of a cell that replicates often.
A polysome is ____
a. the combination of a large and a small ribosomal subunit b. the complex where mRNA splicing occurs c. the promoter assembly at the site of transcription initiation d. an mRNA transcript to which multiple ribosomes are attached e. the complex that adds a poly(A) tail onto an mRNA
Why are modern light microscopes better than the ones Leeuwenhoek used?
A) Modern microscopes have a fivefold better resolution. B) Modern microscopes are compound instead of simple. C) Modern microscopes have lenses with smaller numerical apertures. D) Modern lenses are made of prisms. E) Modern microscopes are compound and have fivefold better resolution.
How many NADH molecules are created during one turn of the Krebs cycle? (Assume the Krebs cycle begins with one acetyl CoA molecule.)
A) six B) four C) eight D) one E) three