Which of the following bacterial products is NOT an exotoxin?
A) Clostridium perfringens ?-toxin.
B) Streptolysin O.
C) Diphtheria toxin.
D) Escherichia coli lipopolysaccharide.
E) Escherichia coli enterotoxin.
Ans: D) Escherichia coli lipopolysaccharide.
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The formation of polyploids in plants is an example of which model of cladogenesis?
A. Parapatric speciation B. Allopatric speciation C. Sympatric speciation
Which of the following statements best describes the role of NAD+/NADH in glycolysis?
A) NADH is used to directly create the phosphoanhydride bonds in ATP. B) NAD+ accepts electrons. C) NADH accepts electrons during fermentation. D) NADH is used primarily in substrate-level phosphorylation. E) All of the above are correct.
Which of the following blood cell functions primarily as phagocytes
a. Eosinophils b. basophils c. lymphocytes d. neutrophils
The movement of water up through a plant is a passive process that requires no energy expenditure by the plant.
Answer the following statement true (T) or false (F)