Antibodies are ________
A) composed of four fatty acid chains
B) a type of lymphocyte
C) proteins with short carbohydrates attached
D) proteins consisting of four polypeptide chains
Answer: D) proteins consisting of four polypeptide chains
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Construct a chart to show at least five major differences between the cytoplasmic membrane and cell wall of bacteria and archaea. What are the implications of these differences?
What will be an ideal response?
The "natural" use of restriction enzymes by bacteria is to
a. integrate viral DNA. b. cut apart short sequences of bases in DNA. c. repair "sticky ends." d. copy the bacterial genes. e. clone DNA.
The bark from _______ tree species was the original source of salicylic acid, the pain-relieving substance in aspirin.
A. Willow B. Cinchona C. Kola D. Maple E. Yew
The carotenoid pigments of some phototrophs interact with ________ to reduce its toxicity
A) singlet oxygen (1O2) B) hydroxyl radical (HO-) C) peroxide anion (O22-) D) superoxide radical (O2-) E) molecular oxygen (O2)