The antibody found in breastmilk and coating mucous membranes is
A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.
Answer: A
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Entropy is a measure of
A. order. B. kinetic energy. C. potential energy. D. disorder. E. complexity.
Which of the following statements is true?
A) Sex determination in fruit flies depends on the X : autosome ratio. B) Mammalian sex determination can be influenced by temperature. C) Mammals experience random Y inactivation. D) The testis-determining factor gene is X-linked. E) Dosage compensation occurs in the same way in most animals.
The water balance problem of plants living in salty soil is the result of:
a. water moving out of plant roots by osmosis. b. extensive leaching. c. a low soil pH. d. low concentrations of micronutrients. e. excessive run off.
Plant meristematic cells _____
A) are distributed evenly in all tissues throughout the plant B) are undifferentiated cells that produce new cells C) increase the surface area of dermal tissue by developing root hairs D) subdivide into three distinct cell types named parenchyma, ground meristem, and procambium