The polar transport of auxin in a seedling
a. occurs in parenchyma cells.
b. uses passive membrane transporters to move
auxin in and out of cells.
c. uses membrane pumps to move hydrogen ions
out of the cytoplasm into the primary cell wall.
d. activates enzymes that loosen cross-links
between cellulose microfibrils.
e. does all of these.
Answer: e
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A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange, and modified segmentation. A knowledgeable zoologist should predict that the adults of this species would also feature ___
A) eight legs B) two pairs of antennae C) a sessile lifestyle D) an open circulatory system E) parapodia
Various techniques have been developed to isolate strains of bacteria carrying a particular mutation. One of them is, bacteria containing wild-type cells and cells of a desired mutant are grown on a medium lacking the nutrient for which the desired mutants are auxotrophic but containing an antibiotic that only kills growing cells. In this environment,
A. both wild-type and mutant cells are killed. B. both wild-type and mutant cells survive. C. wild-type cells survive; mutant cells die. D. wild-type cells die; mutant cells survive. E. only double mutants survive. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the bacteria? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The principal mineralocorticoid is:
a. ADH. b. epinephrine. c. growth hormone. d. aldosterone. e. ACTH.
The placental blood vessels
A) manufacture hormones that slow the growth of the embryo, preventing it from outgrowing the uterus. B) allow for the exchange of wastes and nutrients but keep the maternal and fetal circulations separate. C) draw oxygen from the fetal blood and pass it to the mother. D) mix maternal blood and fetal blood. E) prevent all microbes and toxins from crossing from mother to child.