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
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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
Choose the evidence supporting that snakes evolved from legged lizards. Check all that apply.
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Chemicals that are poisonous to specific cell types are said to be
(a) hazardous. (b) cytotoxic. (c) allelochemicals. (d) bioactive.