If an antibody serves as a B-cell receptor, it will bind to the host cell membrane via region number
a. 1.
b. 2.
c. 3.
d. 4.
e. 6.
E
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Why aren't ferns commonly found in deserts?
A. Fern fronds are sensitive to UV light. B. Fern spores are unable to resist prolonged dry conditions. C. Ferns are non-vascular and cannot absorb water from deep within the soil. D. Fern pollen is spread by insects that do not occur in deserts.
Which pairing accurately describes a one specific type of muscle tissue?
a. smooth muscle tissue – voluntary contraction b. cardiac muscle tissue – involuntary contraction c. smooth muscle tissue – attached to skeleton d. skeletal muscle tissue – one nuclei per cell e. skeletal muscle tissue – slowest speed of contraction
Which microscope forms an image from two sets of light rays, one from the light source and the other diffracted from a structure in the specimen?
a) Fluorescence microscope b) Phase-contrast microscope c) Darkfield microscope d) Confocal microscope
Given the large number of tandem rDNA genes, how is the sequence of each copy prevented from accumulating mutations and becoming nonfunctional?
What will be an ideal response?