The cytoplasmic membranes of ________ contain unbranched phospholipids and proteins.
A. archaeal cells
B. bacterial cells
C. eukaryotic cells
D. both bacterial and eukaryotic cells
E. archaeal, bacterial, and eukaryotic cells
Answer: D
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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce_____.
A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) all spineless progeny E) It is impossible to determine the phenotypes of the progeny.
What benefits would cause an athlete to risk taking erythropoietin or a similar drug?
What will be an ideal response?
Food in a pressure cooker is cooked faster because of the
What will be an ideal response?
A major function of natural killer cells is to ________
A) attack and kill pathogenic microorganisms B) attack virus-infected cells C) tag pathogenic microorganisms with antibodies D) phagocytize microorganisms that have been tagged with antibodies