A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)
A) 50°C
B) 5°C
C) 100°C
D) 10°C
Ans: D) 10°C
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Which of the following describes a feature of amino acid structure?
A. The central or ?-carbon of the amino acid is bonded to three other groups. B. Each amino acid will have either an ?-amino group or an ?-carboxyl group. C. The R groups of amino acids will vary in structure, size, electrical charge, and hydrophobicity. D. The ?-amino and ?-carboxyl groups are frequently modified by phosphorylation. E. In most cases, the central or ?-carbon of the amino acid is bonded directly to a hydroxyl group.
Of the following mammals, you would expect the _____ to have hemoglobin with the lowest affinity for oxygen.
A. mouse B. wolf C. human D. horse E. elephant
Which is/are true regarding organic acids?
A. They are weak acids. B. They are often involved in metabolic reactions. C. They often exist in the ionized form at the near-neutral pH found in a cell. D. Pyruvate and pyruvic acid refer to different forms of the same substance. E. All of the choices are true.
Among which of the following will sexual dimorphism lead to females being larger than
males?
a. among species where males physically fight for access to females b. among species where a male must guard a female to prevent other males from mating with her c. among species where males have to walk long distances to find females but fighting is rare d. Females being larger than males is always beneficial because it leads to higher fecundity.