The and of leaves help to conserve water in a plant.
A. root hairs; stomata
B. Casparian strip; endodermis
C. stomata; cuticle
D. Casparian strip; cuticle
E. None of the answer choices is correct.
C. stomata; cuticle
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Which of the following is not normally considered a pathogenic species of Clostridium?
A. C. perfringens B. C. tetani C. C. acetobutylicum D. C. botulinum
The central dogma describes the flow of information of gene expression as
a. DNA ? RNA ? protein. b. RNA ? DNA. c. RNA ? DNA ? protein. d. protein ? DNA ? RNA. e. DNA ? protein ? RNA.
Bases are compounds that do all the following except
a. they bind hydrogen ions. b. they release hydrogen ions. c. they are pH 7 or above. d. they contain more hydroxide ions than hydrogen ions. e. they raise pH.
Receptors for foreign molecules that are made of protein and shaped like the letter "Y" are called ________
a. antigens b. antibodies c. MHC markers d. cytokines