Which of the following is an example of a defensive protein?
A) cell surface receptor
B) antibody
C) hormone
D) myosin
E) keratin
B) antibody
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Penicillin selection is a positive selection for the isolation of mutants with growth factor requirements
Indicate whether the statement is true or false.
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because ____.
A. the signal is amplified by activation of transcription factors that each catalyze multiple reactions B. each hormone can bind to multiple receptors simultaneously causing amplification of the signal C. the signal is amplified by activation of enzymes that each catalyze multiple reactions D. each hormone can bind to transcription factors simultaneously causing amplification of the signal E. the hormone triggers the cell to release more hormones, amplifying the signal
Which of the following is not a characteristic of salps?
a. Free-swimming lifestyle b. Incurrent and excurrent siphons c. Radial symmetry d. Bioluminescence e. Filter-feeding
The scapula and clavicle are part of the axial skeleton.
a. true b. false