In the early 1900s, determining the chemical basis of heredity was difficult because chromosomes are composed of:
A. DNA.
B. RNA.
C. protein.
D. DNA and protein.
E. DNA, RNA, and protein.
D
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Which of the following is not a function of the Drosophila Sxl protein?
A. prevention of the splicing machinery from recognizing the splice junctions of the E1 or L3 exons of the Sxl mRNA B. mediation of alternative splicing that produces transcripts for functional Tra protein C. binding specifically to the regulated 3' splice site of the tra transcript D. mediation of the splice variant of the dsx transcript leading to repression of female-specific genes
Nucleic acids are polymers made up of which of the following monomers?
A) nucleotides B) sugars C) amino acids D) nitrogenous bases
A major ecological role for fungi is as
A. producers. B. decomposers. C. nitrogen-fixing organisms. D. vectors of disease.
Assume that a base addition occurs early in the coding region of a gene. Is the protein product of this gene expected to have MORE or FEWER altered amino acids compared with the original gene with a base deletion late in the coding region? Explain
What will be an ideal response?