The disinfectant action of phenol and phenolic derivatives mainly is due to
A. extraction of lipids from membranes.
B. oxidation of disulfide bonds in proteins.
C. membrane damage and protein denaturation.
D. damage to nucleic acids and proteins caused by free radicals.
E. its inherent detergent action.
Answer: C
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Which of the following statements about osmoregulators is false?
A. They are restricted to environments with stable solute concentrations. B. Some organisms can switch between acting as an osmoconformer and an osmoregulator depending on environmental conditions. C. An osmoregulator uses more energy to control body fluid solute levels than an osmoconformer. D. The osmotic pressure between the inside and outside of internal cells is usually similar. E. Animals that maintain body fluid solute concentrations that are higher than that of the external environment and animals that maintain body fluid solute concentrations that are lower than that of the external environment are both considered to be osmoregulators.
If you were studying a soil sample from another planet and you discovered some interesting specimens that seemed to be alive, what procedure could you use to verify that they were indeed alive?
What will be an ideal response?
This animal has two atria and one ventricle and two vascular circuits. This animal is a(n) ____
a. salmon b. woodpecker c. alligator d. rat e. frog
Ionizing radiation
a. breaks apart chromosomes. b. alters genes. c. extends the length of the DNA molecules. d. links DNA molecules together. e. both breaks apart chromosomes and alters genes.