Consider the thermodynamic properties of chemical reactions. Even though enzymes do not affect the overall energy of the reactants or the products ( the thermodynamics), they alter the speed of the reaction. Enzymes accomplish this by doing which of the following?
A.) increasing the activation energy of a reaction
B.) not altering the activation energy of a reaction
C.) reducing the activation energy of a reaction
D.) eliminating the activation energy of a reaction
E.) supplying the activation energy for a reaction
Ans: C.) reducing the activation energy of a reaction
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In the Northern Hemisphere, the shortwave radiation is highest during the
A) March equinox. B) September equinox. C) June solstice. D) December solstice.
Muscle contraction occurs because
A. actin filaments contract the sarcoplasmic reticulum. B. actin filaments contract and pull on myosin filaments. C. myosin filaments are stimulated by acetylcholine. D. myosin filaments pull on actin filaments.
Which of these hormones stimulates the production of milk?
A) Oxytocin B) Prolactin C) Estrogen D) Progesterone E) Colostrum
Assume that a man who carries an X-linked gene has children. Assuming normal meiosis and random combination of gametes, the man would pass this gene to ________
A) all of his sons B) half of his sons C) all of his children D) half of his daughters E) all of his daughters