Vitamin C ____
a. helps blood to clot
b. is needed to make collagen
c. is used to create coenzymes
d. is fat soluble
e. protects cell membranes
ANSWER: b
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Which of the following is a difference between Class I and Class II major histocompatibility complex (MHC) proteins?
A) Class I MHC proteins can be found on most cell types, while Class I and II MHC proteins are found on the antigen presenting cells of the immune system B) Class I MHC proteins are added to antigens in the cytoplasm, while Class II proteins are added to antigens in the Golgi apparatus. C) Class I MHC proteins signal the immune system to activate the cell displaying the message, while Class II proteins signal the immune system to destroy a particular cell. D) Class I and Class II MHC proteins have the same basic role, but individuals with particularly strong immune systems will have both types, while most individuals have just one or the other.
The uneven distribution of an impermeable solute on either side of a membrane will result in
A. an increase in oxygen deprivation. B. proton pumping. C. root pressure. D. osmosis. E. stomatal closing.
Four of the five answers below are correct statements about seedless vascular plants. Select the exception
a. Sporophytes are independent of gametophytes. b. Water is not needed for gamete transport. c. Sporophytes have vascular tissue. d. Seeds are not produced. e. Living members still exist.
Methyl salicylate triggers the genes that code for the systemic acquired resistance pathway. Indicate whether the statement is true or false