Reference no: EM133834072
Questions
1. Positional information in a fertilized egg leads to:
A) complete inhibition of gene expression in the egg.
B) constitutive expression of genes in all cells of the organism.
C) differential expression of genes in all cells of the organism.
D) constitutive expression of genes in cells of developing regions of the organism.
E) differential expression of genes in cells of developing regions of the organism.
2. A gene family is defined as a group of genes that encode identical polypeptides, with only minor variations in DNA sequence.
A) True
B) False
3. Most genes are uninterrupted (lack introns) in insects.
A) True
B) False
4. In multicellular eukaryotes, an average exon encodes:
A) about 50 amino acids.
B) about 75 amino acids.
C) about 100 amino acids.
D) about 150 amino acids.
E) about 220 amino acids.
5. When comparing exons and introns, mutations occur:
A) at a greater rate in exons, but with most of them being removed.
B) at a greater rate in introns, with most of them being unrepaired.
C) at the same rate in both exons and introns, but are removed more efficiently from introns.
D) at the same rate in both exons and introns, but are removed more efficiently from exons.
E) exclusively in the introns.
6. Most mutations that affect RNA splicing are:
A) deletions in the central portion of introns.
B) single-base deletions at intron-exon junctions.
C) single-base insertions at intron-exon junctions.
D) single-base substitutions at intron-exon junctions.
E) single-base substitutions within an adjacent exon.
7. Mutations that affect splicing:
A) are usually inconsequential.
B) are usually deleterious.
C) are always deleterious.
D) increase gene expression.
E) can be either deleterious or advantageous at about equal probability.
8. In general, as genome size increases in different organisms:
A) exons also increase in size.
B) introns increase in size.
C) both exons and introns increase in size.
D) 5' and 3' untranslated regions increase in size.
E) the length of genes stays about the same.
9. Only mutations in exons and the 5' UTR can affect production of protein from a gene.
A) True
B) False
10. Variations in the lengths of genes are primarily determined by the lengths of the introns.
A) True
B) False