bio quiz practice

Control of gene expression in eukaryotic cells occurs at which level(s)?

• 1. only the transcriptional level

• 1. epigenetic and transcriptional levels

• 1. epigenetic, transcriptional, and translational levels

• 1. epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels

Post-translational control refers to:

• 1. regulation of gene expression after transcription

• 1. regulation of gene expression after translation

• 1. control of epigenetic activation

• 1. period between transcription and translation

How does the regulation of gene expression support continued evolution of more complex organisms?

• 1. Cells can become specialized within a multicellular organism.

• 1. Organisms can conserve energy and resources.

• 1. Cells grow larger to accommodate protein production.

• 1. Both A and B.

If glucose is absent, but so is lactose, the lac operon will be ________.

• 1. activated

• 1. repressed

• 1. activated, but only partially

• 1. mutated

Prokaryotic cells lack a nucleus. Therefore, the genes in prokaryotic cells are:

• 1. all expressed, all of the time

• 1. transcribed and translated almost simultaneously

• 1. transcriptionally controlled because translation begins before transcription ends

• 1. b and c are both true

What are epigenetic modifications?

• 1. the addition of reversible changes to histone proteins and DNA

• 1. the removal of nucleosomes from the DNA

• 1. the addition of more nucleosomes to the DNA

• 1. mutation of the DNA sequence

The binding of ________ is required for transcription to start.

• 1. a protein

• 1. DNA polymerase

• 1. RNA polymerase

• 1. a transcription factor

Which of the following is not a possible size (in bp) of the mature mRNA?

• 1. 205bp

• 1. 180bp

• 1. 150bp

• 1. 100bp

You are working in a molecular biology lab and, unbeknownst to you, your lab partner left the foreign genomic DNA that you are planning to clone on the lab bench overnight instead of storing it in the freezer. As a result, it was degraded by nucleases, but still used in the experiment. The plasmid, on the other hand, is fine. What results would you expect from your molecular cloning experiment?

• 1. There will be no colonies on the bacterial plate.

• 1. There will be blue colonies only.

• 1. There will be blue and white colonies.

• 1. The will be white colonies only.

GMOs are created by ________.

• 1. generating genomic DNA fragments with restriction endonucleases

• 1. introducing recombinant DNA into an organism by any means

• 1. overexpressing proteins in E. coli

• 1. all of the above