Refer to the accompanying figure. What major function is associated with this type of tissue?
a. protecting underlying cells from abrasion
b. moving of materials along a tissue surface
c. producing secretions such as mucus and sweat
d. secreting and absorbing
e. strengthening
b
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Which of the following is nottrue of the regulation of the trp operon?
A. Transcription attenuation relies on the fact that bacteria lack a nucleus. B. The level of tryptophan in the cell regulates the rate of transcription after transcription begins. C. The level of tryptophan in the cell regulates the rate of transcription before transcription begins. D. RNA polymerase is recruited to the promoter when tryptophan levels are high.
Density-dependent factors that affect the growth of a population would including which of the following?
a. volcanoes b. hurricanes c. disease d. floods
Penicillins and cephalosporins
A. damage cell membranes. B. block peptidases that cross-link glycan molecules. C. attach to the 30S ribosomal subunit and disrupt protein synthesis. D. are metabolic analogs of PABA and block folic acid synthesis. E. destroy peptidoglycan.
The following steps are used to produce monoclonal antibodies. What is the fourth step?
A) A B cell is activated to produce antibodies. B) Culture the hybridoma in a selective medium. C) Fuse a B cell to a myeloma cell. D) Isolate antibody-producing B cells. E) Vaccinate a mouse.