Which of the following is not a function of the Fc portion of the immunoglobulin molecule?
A. Binding to the antigen
B. Binding to a component of the complement system
C. Binding to host cells including some cells of the immune system and some phagocytic cells
D. All of the choices are functions of the Fc end of an immunoglobulin molecule.
Answer: A
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a. Anal opening b. Fingertips c. Mouth d. Nose e. Eyes
Penicillin works most effectively against gram-positive bacteria because:a
penicillin affects cell membranes. b. they have a thick peptidoglycan cell wall, and penicillin affects the synthesis of peptidoglycans. c. they have special protein channels that allow penicillin to enter the cell and halt the cell cycle. d. they are smaller than gram-negative bacteria and, thus, easily take up penicillin by diffusion. e. they contain prophages that negatively interact with penicillin.
Plasmid vectors often contain ________ genes that can be used to screen for recombinants.
A. metabolic activation B. promoter/operator C. antibiotic resistance D. insertion sequence
A chain of ganglia that extends the length of a body called the ______.
A. ganglion B. sensory neurons C. notochord D. nerve net E. nerve cord