Which of the following events must occur to cause a chromosomal translocation, such as that seen in individuals with chronic myelogenous leukemia (CML)?
A. The broken ends must pair correctly.
B. A mutation in the DNA must occur.
C. A transposon must be present in one of the chromosomes.
D. Two different chromosomes must break.
E. One chromosome must break in two distinct locations.
Answer: D
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The third line of defense, or adaptive mechanisms, are different from innate mechanisms in
that ____________________.
a. white blood cells engulf antigens b. physiological barriers play a larger role in the defense c. antigens are involved d. B- and T-cells target specific antigens
Which statement correctly describes horizontal gene transfer?
a. Conjugation, transformation and transduction are all forms of horizontal gene transfer. b. Conjugation and transformation are forms of horizontal gene transfer, but transduction is a form of vertical gene transfer. c. Eukaryote-eukaryote transfers of nuclear genes are most common. d. Prokaryote-eukaryote transfers of nuclear genes are most common. e. Partial diploids always result from horizontal gene transfer.
The mucus cocoon of parrotfish is used as a means of:
a. masking the fish's scent. b. discouraging parasites from attaching. c. capturing plankton prey. d. maintaining osmotic balance. e. maintaining thermal constancy
Ozone in the atmosphere shields us from ________
Fill in the blank(s) with correct word