The limiting factor of any compound light microscope (i.e., the thing that limits its resolution to 0.2 ?m) is the:
A) number of condenser lenses it has.
B) number of magnifying lenses it has.
C) number of ocular lenses it has.
D) wavelength of visible light.
D) wavelength of visible light.
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Examine the pedigree in the accompanying figure. Individuals affected by the genetic condition in question are
indicated by filled squares or circles. Which inheritance pattern is most likely correct for this condition in this family?
a. autosomal dominant b. X-linked recessive c. X-linked dominant d. cytoplasmic inheritance e. autosomal recessive
In addition to the capsid, some viruses also have which of the following?
a. a virion b. a cell wall c. a viral envelope d. a plasma membrane
You encounter a bear while hiking, which of the following predominates and causes an increase in
your heart rate and breathing to help you run away?
a. the central nervous system. b. the sympathetic nervous system c. the parasympathetic nervous system d. somatic nervous system e. cranial nerves
You know that Gip 1 is only expressed in adult liver cells and not in the liver of embryos. You also know that Jk8 and Pa5 behave similarly on other promoters in the embryo or in the adult, in terms of whether they act as repressors or gene activators. Given the data, use of which of the following mechanisms would make the most sense for regulating the Jk8 and Pa5 proteins?
(a) Jk8 is ubiquitylated and targeted for destruction in adult cells. (b) Jk8, but not Pa5, is transcribed in embryonic liver cells. (c) Jk8 binds to the promoter of the gene that encodes Jk8 in embryonic liver cells. (d) Pa5 binds to the promoter of the gene that encodes Jk8 in embryonic liver cells.