Normal white blood cells (called B cells) and cancerous B cells that cause leukemia both carry a unique surface protein
called CD-19.
a. True
b. False
ANSWER: True
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Methanogens that use methyl-CoM for biosynthesis use ________ as a substrate
A) acetate B) carbon monoxide C) methane D) methanol
In the ___ cycle, the lambda bacteriophage's DNA ____. Select all correct choices
A. lytic; hijacks the cell to create more viruses B. lytic; recombines with bacterial DNA and is passed on to subsequent bacterial cells C. lysogenic; hijacks the cell to create more viruses D. lysogenic; recombines with bacterial DNA and is passed on to subsequent bacterial cells
When a blood vessel gets damaged, contractions of smooth muscle referred to as ________ help constrict the vessel to reduce blood flow
A) vascular spasms B) hemostasis C) homeostasis D) formed elements E) endocytosis
In order to assess the species diversity of a community, you would need to know the number of different species present as well as ________
A) the number of trophic levels in the community B) the intensity of interspecific competition in the community C) the fraction of these species that are plants D) the relative abundance of the different species