In regions of the human body that must precisely control what enters or exits tissues, which one of the following is(are) present to ensure adjacent cells are packed close together?
A) basement membrane
B) adhesion junctions
C) collagen
D) tight junctions
E) gap junctions
D
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Histone proteins are the principal agents in chromatin packaging. The nucleosome core particle is a heterooctameric protein complex that contains two molecules each of the four histones H2A, H2B, H3, and H4
Describe the process of managing existing nucleosome core particles during replication and the process of adding these and new nucleosome core particles to DNA after the replication fork passes.
Refer to the accompanying figure. Which label indicates the location of the promoter region?
a. A
b. B
c. C
d. D
e. E
Alveoli
A) are blind sacs that extend from tracheae. B) are found in gills. C) are thick-walled. D) are not permeable to dissolved oxygen. E) have a moist surface.
The fungal cell membrane component that is targeted by many anti-fungal drugs is:
A. Cholesterol B. Teichoic acid C. Ergosterol D. Peptidoglycan