Problem Set # 10

Which of the following statements about the DNA in one of your brain cells is true? Each gene lies immediately adjacent to an enhancer. Most of the DNA codes for protein. The majority of genes are likely to be transcribed. It is the same as the DNA in one of your liver cells.

It is the same as the DNA in one of your liver cells.

Proto-oncogenes can change into oncogenes that cause cancer. Which of the following best explains the presence of these potential time bombs in eukaryotic cells? Proto-oncogenes are mutant versions of normal genes. Proto-oncogenes are genetic "junk." Proto-oncogenes normally help regulate cell division. Proto-oncogenes first arose from viral infections.

Proto-oncogenes normally help regulate cell division.

Muscle cells differ from nerve cells mainly because they have unique ribosomes. express different genes. contain different genes. use different genetic codes.

express different genes

Within a cell, the amount of protein made using a given mRNA molecule depends partly on the types of ribosomes present in the cytoplasm. the number of introns present in the mRNA. the rate at which the mRNA is degraded. the degree of DNA methylation.

the rate at which the mRNA is degraded.

Which of the following is an example of post-transcriptional control of gene expression? the binding of transcription factors to a promoter gene amplification contributing to cancer the removal of introns and alternative splicing of exons the addition of methyl groups to cytosine bases of DNA

the removal of introns and alternative splicing of exons

The functioning of enhancers is an example of a eukaryotic equivalent of prokaryotic promoter functioning. transcriptional control of gene expression. the stimulation of translation by initiation factors. post-translational control that activates certain proteins.

transcriptional control of gene expression.