Gas exchange occurs where?

a. trachea
b. pharynx
c. alveoli
d. bronchi


c. alveoli

Biology & Microbiology

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Compare and contrast facilitated and active transport

What will be an ideal response?

Biology & Microbiology

What type of allele is often detected as a distortion in segregation ratios, where one class of expected progeny is missing?

A) dominant negative allele B) temperature-sensitive allele C) lethal allele D) partial dominance E) incomplete penetrance

Biology & Microbiology

The avian erythroblastosis virus contains an oncogene called erbB that encodes ___________.

a) an underexpressed nuclear protein b) an elongated auxillary protein of the cytoskeleton c) an altered insulin receptor that binds insulin with lower affinity d) an altered transcription factor that turns on hemoglobin synthesis e) an altered EGF receptor that is missing part of the extracellular domain that binds to the growth factor

Biology & Microbiology

_________ is the primary enzyme in genomic replication for Proteus vulgaris.

a) DNA polymerase III b) RNA polymerase holoenzyme c) DNA ligase d) RNA polymerase II

Biology & Microbiology