Which of the following statements about exotoxins is generally FALSE?
A) They are more potent than endotoxins.
B) They are composed of proteins.
C) They are resistant to heat.
D) They have specific methods of action.
E) They are produced by gram-positive bacteria.
C
You might also like to view...
Which of the following statements is true regarding subduction?
A. It adds new crust to Earth's surface via volcanic activity. B. It is unrelated to Earth's plate tectonics. C. It permanently removes carbon from Earth's surface. D. It permanently adds carbon to Earth's atmosphere. E. The carbon it removes is eventually returned to the atmosphere by volcanism.
When using ________ as a terminal electron acceptor, Thiobacillus can sequentially reduce nitrate to nitrogen gas in a process called ________. Certain Thiobacillus species can also chemolithotrophically use ________ as an electron donor.
What will be an ideal response?
The seminal vesicles secrete:a
fructose, which nourishes the developing embryo. b. a basic fluid, which neutralizes the acidic environment of the vagina. c. mucus, which lubricates the penis. d. sperm, which fertilize the ovum. e. prostaglandins, which stimulate contraction of the uterus.
Which chordate group has the most species?
a. bony fishes b. reptiles c. amphibians d. mammals e. cartilaginous fishes