The association of four subunit peptides in a fully functional molecule of hemoglobin is a good example of ____ protein structure
a. primary
b. secondary
c. tertiary
d. quaternary
e. aggregate
d
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Which of the following is not a component of some sponge skeletons?
A. cartilage B. protein C. glass-like silica (SiO2) D. calcium carbonate (CaCO3)
Which of the following is incorrect about plan
B contraception?
a. it is used after intercourse has taken place b. it is only available with a prescription for women over 17 c. it delivers a large dose of progesterone d. it prevents ovulation e. all of these are correct about plan B
Which statement is true?
a. The movement of solvent occurs from a hypotonic solution to an isotonic solution. b. The net movement from an isotonic to a hypotonic solution involves the movement of solute molecules only. c. The concentration of the solute is greater in an isotonic solution than in a hypertonic solution. d. The concentration of the solvent is greater in a hypertonic solution than in an isotonic solution. e. Osmosis involves only hypertonic solutions.
Which of the following statements about Figure 4-1 is true?
a. Figure B has a greater surface area than Figure A.
b. Figure B has a greater volume than Figure A.
c. Figure B has a smaller volume than Figure A.
d. Figure B has a greater surface area to volume ratio than Figure A.
e. Figure B has a smaller surface area to volume ratio than Figure A.