Exam 8: Gene Expression and Control

How many codons specify the amino acid leucine?

Which enzyme unwinds the DNA during transcription?​

Matching ​Match each term with the most appropriate description. -​sites for polypeptide assembly A)​anticodon B)​rRNA C)​codon D)​ribosome E)​genetic code F)​translation termination G)​messenger RNA H)​promoters I)​transcription J)​translation

Identify the type of mutation associated with the following questions and statements. Some answers may be used more than once. -Which type of mutation replaces glutamic acid with valine in beta globin proteins in individuals with sickle-cell anemia? A)deletion only B)insertion only C)base-pair substitution D)frameshift mutation

Once the amino acid on the second tRNA bonds with the amino acid of the first tRNA, what happens to that first tRNA?

Transcription starts at a region of DNA called a(n) _____.​

Which nucleotide is added to the end of a completed messenger RNA transcript?​

If the codon consisted of only 2 nucleotides, _____ codons would be possible.​

In eukaryotes, DNA is transcribed in the _____.​

How many nucleotides comprise one codon?​

The tightly condensed nonfunctional X chromosome is called a(n) _____.

The toxicity of ricin has been known since ____.

A Barr body exists for the purpose of _____.​

Ricin inactivates _____.​

Which RNA acts as an enzyme?​

Epigenetic modifications _____.​

Transcription factors bind to _____.

The master gene for male sex determination is located on _____.​

​The difference between normal and sickle-cell hemoglobin is _____.

Matching ​Match each term with the most appropriate description. -​binds to ribosomes to begin translation A)​anticodon B)​rRNA C)​codon D)​ribosome E)​genetic code F)​translation termination G)​messenger RNA H)​promoters I)​transcription J)​translation