Which of the following statements is NOT true of Gram-positive bacteria?
A. They have a thicker peptidoglycan layer than do Gram-negative bacteria.
B. They turn purple when subjected to the Gram-staining process whereas Gram-negative bacteria stain pink.
C. They lack the lipopolysaccharides that Gram-negative bacteria have.
D. They are less resistant to antibiotics than Gram-negative bacteria.
E. They have a gram molecular weight of more than 1.0 whereas Gram-negative bacteria have a gram molecular weight of less than 1.0.
E. They have a gram molecular weight of more than 1.0 whereas Gram-negative bacteria have a gram molecular weight of less than 1.0.
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In a woman's monthly cycle, the hormone _____ is released when estrogen reaches a peak
a. luteinizing hormone b. oxytocin c. progesterone d. testosterone e. human chorionic gonadotrophin
The valve between “C” and “E” is the
a. right AV valve. b. right semilunar valve. c. left AV valve. d. left semilunar valve. e. aortic valve.
Phylogeny is deciphered to build phylogenetic trees using
A. the fossil record B. homology C. molecular data D. all of the choices
A cline is:
a. a temporal gradient in the frequency of genotypes and phenotypes. b. a spatial gradient in the frequency of genotypes and phenotypes. c. an area of resource competition. d. an area of assortative mating.