Which of the following occurs during metaphase?
A. Chromosomes are about 30 nm wide.
B. Heterochromatin is converted to euchromatin.
C. The "beads on a string" structure is visible.
D. Chromosomes undergo gene transcription.
E. Chromosomes are much shorter than they were in interphase.
Answer: E
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Intestinal parasites can be identified by observing stool samples for the presence of
A) cysts. B) antibodies. C) LPS. D) blood.
Choose the evidence supporting that snakes evolved from legged lizards. Check all that apply.
_____ Snakes have pelvic bones. _____ The oldest snake-like fossils have leg bones. _____ Transitional fossils show sections of the snake backbone evolving into legs. _____ Snake embryos temporarily develop limb buds which are reabsorbed before birth. 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 evidence for evolution? 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?
Chemicals that are poisonous to specific cell types are said to be
(a) hazardous. (b) cytotoxic. (c) allelochemicals. (d) bioactive.
Which lineage of Echinoderms is made up of about 950 species of sea urchins and sand dollars, which have their ossicles fused into solid tests that restrict flexibility but provide excellent protection?
a. Holothuroidea b. Crinoidea c. Asteroidea d. Echinoidea