Which of the following solutions would require the addition of the greatest amount of base to bring the solution to neutral pH?
A) gastric juice at pH 2
B) vinegar at pH 3
C) black coffee at pH 5
D) household bleach at pH 12
A
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Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. Which of the following are part of the cytoskeleton?
a) microfilaments b) the nuclear envelope c) nucleoli d) mitochondria e) lysosomes
Which order below reflects the correct procedure for Gram staining?
A. alcohol/acetone-crystal violet-safranin-iodine B. crystal violet-alcohol/acetone-iodine-safranin C. crystal violet-iodine-alcohol/acetone-safranin D. iodine-safranin-crystal violet-alcohol/acetone E. alcohol/acetone-safranin-crystal violet-iodine
Double fertilization is
A. fertilization of two eggs in the same flower.B. fertilization of an egg by two sperm. C. fertilization of an egg by one sperm and an endosperm-forming cell by another sperm. D. fertilization of two eggs by the same sperm. E. fertilization of an egg and an endosperm-forming cell by the same sperm.
Animals that see only black and white have predominantly what type of photoreceptors?
a. rod cells b. cone cells c. dendrites d. photo discs