Chytridiomycetes produce enzymes that digest cellulose, chitin, and similar molecules. These fungi are contributing to the decline of amphibians worldwide through what mechanism?
A. by digesting cellulose in the cell wall of the frog's cells
B. by digesting chitin in the cell wall of the frog's cells
C. by infecting their lungs
D. by killing their eggs in the water
E. by digesting keratin in the frog's skin
E. by digesting keratin in the frog's skin
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Benedict's reagent is a chemical that is used as a test for the presence of a free aldehyde functional group on glucose. The aldehyde is used when glucose and fructose bind together to form sucrose, and the Benedict's test is negative. Starch contains a great deal of glucose but gives a negative Benedict's test because:
A. all of the aldehyde groups on the starch are oxidized and cannot react with the Benedict's reagent. B. glucose in starch has lost a carbon atom and cannot react with Benedict's reagent. C. only the glucose at the end of a chain of starch will have an exposed aldehyde functional group to react with Benedict's reagent. D. starch is not soluble in water and cannot react with Benedict's reagent.
A hypothetical population has two alleles for a gene: A and a. In a random sample of 100 individuals, 20 are homozygous for a, 20 are homozygous for A, and 60 are heterozygous. What is the frequency of A?
A) 20% B) 25% C) 50% D) 60% E) 80%
According to the animation, which of the following makes mRNA from the information stored in a DNA template?
a. DNA polymerase b. tRNA c. Ribosomes d. RNA polymerase
Which of the following is the Domain to which you belong?
a) Domain Bacteria b) Domain Archaea c) Domain Eukarya d) Domain Animalia e) Domain Chordata