Which of the following statements is not true of root hairs?
A. They are extensions of the root epidermis.
B. They function to increase the surface area
of roots.
C. They are not in direct contact with vascular
tissue.
D. They are large cells on the surface of
roots.
D
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Which of the following cell types migrates to the lymphoid tissue after encountering pathogens in the skin or the mucous membranes?
A. Macrophages B. Dendritic cells C. Mast cells D. None of the choices are correct.
You are studying the development of a poorly-understood species at the 8-cell stage. You use a laser to zap away a certain one of the eight cells, and discover that part of the gut is missing once the embryos finish development. Your colleague, who is working on a different species, uses the laser to blast away one of the cells in her embryos, zapping each of the possible cells in a set of eight experiments. However, when the embryos finish development, every one is perfectly normal! What can you conclude about the two species?
A. The first species has regulative development, the second has non-regulative development. B. The first species has non-regulative development, the second has regulative development. C. Both species have regulative development. D. Both species have non-regulative development. 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 cleavage and developmental pathways? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Cerebrospinal fluid is found in the space between ____
a. arachnoid and pia maters b. skull and dura mater c. pia mater and brain d. dura and arachnoid maters e. scalp and skull
Which type of anatomical feature is a plant stem considered to be?
a. an organ b. a meristem c. a shoot system d. a tissue