The sliding filament model of muscle contraction explains that:
A. Tropomyosin must be removed from the
actin molecule before it can bind to myosin.
B. Muscle contraction requires energy in the
form of GTP.
C. The sarcomere stretches to create
contraction.
D. Actin filaments slide past myosin, causing
the shortening of the muscle fiber.
D
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The hexameric model of DNA unwinding proposes that:
A. DNA strands are separated prior to helicase binding. B. one dimer is responsible for ATP hydrolysis. C. two dimers rotate the responsibility of ATP hydrolysis. D. three dimers rotate the responsibility of ATP hydrolysis. E. dimer conformational changes drive ATP hydrolysis.
Plant cell walls are composed of which of the following?
A. Cellulose B. Sucrose C. Protein D. Wax
Your classmate is trying to keep all the facts about biological molecules straight. He asks you to explain how amino acids and proteins are related. What do you tell him?
A) Amino acids are formed by joining together many proteins. B) Proteins are chains of carbohydrates, and amino acids are a type of lipid. C) Proteins are made up of chains of amino acids. D) Proteins are a portion of an amino acid.
Discuss the major trends in hominid evolution
What will be an ideal response?