During metaphase,
A. chromosomes condense.
B. the nuclear membrane reforms.
C. chromatids separate.
D. the nucleolus reappears.
E. chromosomes line up on the equatorial plane.
Answer: E
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The scientist credited with the discovery of DNA, which he called "nuclein," from salmon sperm in 1869 is
A) Johann Friedrich Meischer. B) Eduard Zacharias. C) Fredrick Griffiths. D) Martha Chase. E) Oswald Avery.
A plant that has the mutant form of the WEREWOLF gene (wer) would be identifiable by
A. the excessive number of vascular bundles in stem. B. the lack of fibers in the outer portions of the stem. C. the abundance of microscopic hairs on the root. D. the extra thick layer of mesophyll cells in the leaf. E. the lack of microscopic hairs along the epidermis of the root.
Which statement concerning root hairs is not correct?
A. Root hairs are tubular extensions of individual epidermal cells. B. A root hair is isolated from its epidermal cell with a cross wall. C. Root hairs generally live only a few days before being sloughed off. D. Root hairs increase the absorption of water and minerals. E. Root hairs are located in the zone of maturation of a root.
Two patients developed endophthalmitis within 24 hours after corneal transplant surgery. Streptococcus pneumoniae was isolated from conjunctival swabs of the affected eyes of both patients and from the supply of packing that was used to cover the eyes after surgery. This is an example of __________.
A) vehicle transmission B) contact transmission C) a nosocomial infection D) airborne transmission