In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis?
A) on the outside of vesicles
B) on the inside surface of the cell membrane
C) on the inside surface of the vesicle
D) on the outer surface of the nucleus
C
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If you closed your eyes, you would still be able to write your name on a piece of paper. Which
receptors are most involved with this activity?
a. mechanoreceptors b. chemoreceptors c. photoreceptors d. all of these
If an individual is born without Pacinian corpuscles:a
they would not manufacture red blood cells. b. they would not sense heat from a burning match. c. they would not feel pain. d. they would not sense surface vibrations easily. e. they would not sense heavy pressure quickly
Which of the following statements regarding Neisseria meningitidis is FALSE?
A. There are vaccines available to prevent infection with all strains. B. Up to 40% of the population are carriers. C. Humans are the only natural carriers. D. Transmission is via respiratory droplets. E. It often causes meningitis.
How pathogenic are alpha toxin–containing clostridia compared to those lacking it, and why?
a. They are less pathogenic, because the alpha toxin is quickly recognized by the immune system, which subsequently rids the body of the pathogen. b. They are less pathogenic, because the beta toxin is more toxic and the clostridia produce only one or the other. c. They are more pathogenic, because the toxin enables the clostridia to lyse healthy human cells and grow/spread further. d. They are more pathogenic, because the toxin is a protective molecule that enablesthem to hide from immune cells.