What happens to contrast and resolving power when the aperture of the condenser (i.e., the size of the hole through which light passes before it reaches the specimen) of a compound light microscope is decreased?
What will be an ideal response?
Contrast increases, resolving power (quality of the image) decreases.
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Analysis of the primary transcript for an insulin receptor protein reveals that exon 11 has been removed from the mRNA in skeletal muscle, but not in liver. How does this affect the proteins synthesized in these two types of cells?
A. Translation of the insulin receptor mRNA is inhibited in skeletal muscle. B. Translation of the insulin receptor mRNA is inhibited in the liver. C. The mRNA transcript for the insulin receptor protein will be identical in both the liver and skeletal muscle and so translation occurs in both cell types. D. The insulin receptor in skeletal muscle has a higher affinity for insulin than the receptor in the liver. E. The insulin receptor in the liver has a higher affinity for insulin than the receptor in skeletal muscle.
The zipper-like connection between paired homologs in early prophase is known as a
A) spindle fiber. B) synaptic junction. C) synaptonemal complex. D) chiasma. E) None of the choices is correct.
When a protein denatures, what type of
bonding is affected?
a. covalent b. peptide c. ionic d. hydrogen e. metallic
Of all the plant hormones, which one is a gas?
a. auxin b. cytokinin c. gibberellin d. ethylene e. abscisic acid