The genetic variation that exists among humans is mainly due to the differences that exist within their ________
a. alleles
b. ribosomes
c. parents
d. cell membranes
e. cells
a
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Which of the following characteristics is unique to chytrids compared to other groups of fungi?
A) flagellated spores B) zoospores C) autotrophic mode of nutrition D) cell walls of cellulose E) nucleotide sequences of several genes
Which of the following is not an example of the relationship between structure and function in proteins and nucleic acids?
A. Glycosylation of RNA can be important for cell-surface differentiation between "self" and "nonself." B. Methylation of DNA is important for accurate DNA replication. C. Modification of RNA bases can be important for biological activity. D. Modification of amino acids can be important for binding of proteins to other molecules. E. Phosphorylation of amino acids can be important for biological activity of proteins.
Which of the following is not a flatworm?
a. tape worm b. ringworm c. blood fluke d. planaria e. Bipalium
How many codons can act as termination codons?
A) four B) three C) one D) two