Which of the following does NOT produce an exotoxin?
a. Bordetella pertussis
b. Corynebacterium diphtheriae
c. Mycobacterium tuberculosis
d. Streptococcus pygogenes
e. All of these produce an exotoxin.
Ans: c. Mycobacterium tuberculosis
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The distribution in Figure 55-1 could be inverted:a
if the producers had a high rate of productivity and reproduction, coupled with intense predation. b. if the rate of biomass production of the primary consumers is greater than that of the producers. c. if the rate of productivity of the primary consumers is greater than the primary productivity. d. if the standing biomass of the producers is greater than the biomass of all of the consumers. e. only under artificial or laboratory conditions.
Excessive collagen formation often results in a hard, raised scar. This is called:
a. keloid b. adhesion c. dehiscence d. secondary union
To detect whether or not a cell has a specific region of a gene, researchers add radioactively labeled DNA molecules that can bind to their complementary DNA sequences. To detect a mutant version of the BLM gene, researchers added the radioactive DNA
molecule 5' - GCTAGCTAAGCCCA - 3' to cells. What DNA sequence were the researchers trying to detect? A) 5? - GCTAGCTAAGCCCA - 3' B) 3? - GCTAGCTAAGCCCA - 5' C) 5? - CGATCGATTCGGGT - 3' D) 3? - CGATCGATTCGGGT - 5'
Organs repair themselves through a process of?
A. Meiosis B. Mitosis C. Cellular differentiation D. Transformation