Which term most accurately describes the nutritional mode of healthy P. bursaria?
A) photoautotroph
B) photoheterotroph
C) chemoautotroph
D) mixotroph
D
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Which one of the following is the external structure of the ear that enhances reception of sound waves?
A. tympanic membrane B. oval window C. cochlea D. pinna
Antigen receptors are capable of producing large diversity due to the fact that there are __________
cassettes (versions) of each __________. Fill in the blank(s) with the appropriate word(s).
In Drosophila melanogaster, polytene chromosomes are produced when
A) a chromosome breaks and rejoins with another section of the same chromosome. B) a cell divides several times before the chromosomes are duplicated. C) chromosomes are duplicated repeatedly without a corresponding nuclear division. D) a segment of a chromosome is duplicated during an unequal crossing-over event. E) characteristic banding patterns form on the chromosomes.
During replication, which enzyme unwinds the DNA double helix?
A. DNA helicase B. DNA ligase C. DNA gyrase D. DNA primase E. DNA polymerase I