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11 Feb 2018

Introns:

A: are frequently present in prokaryotic genes but are rare in eukaryotic genes.

B: are spliced out before transcription.

C: are translated but not transcribed.

D: can occur many times within a single gene.

E:encode unusual amino acids in proteins.

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Collen Von
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12 Feb 2018

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Related questions

The colinearity of prokaryotic genes means that:

A) within a prokaryotic gene, both DNA strands encode the same polypeptide.

B) a prokaryotic polypeptide has exactly 3x as many amino acids as the number of nucleotides in the gene encoding it.

C) prokaryotic proteins are identical in length to their genes.

D) prokaryotic genes contain a continuous unbroken sequence encoding a polypeptide.

E) a physical map of a gene will not match the amino acid map of its polypeptide product.

1. What are the three processes in post-transcriptional processes that must be completed before transcripts can be translated in eukaryotes?
A. Binding of snRNPs, addition of a poly A tail, splicing of introns
B. Binding of snRNPs, transporting, synthesizing of ribose
C. Capping, transporting, synthesizing of ribose
D. Binding of snRNPs, capping, splicing
E. Capping, splicing, addition of a poly A tail
2. Which of the following key differences between prokaryotic and eukaryotic transcription are TRUE? Check all that apply.
A. prokaryotic transcription occurs in the cytoplasm, while eukaryotic transcription occurs in the nucleus
B. eukaryotic transcription is carried out by 1 RNA polymerase, while prokaryotic transcription is carried out by 3 different RNA polymerases
C. eukaryotic transcripts are processed, while prokaryotic transcripts are translated while transcription is still occurring
D. prokaryotes have sigma factors for specificity of binding whereas eukaryotes have multiple general transcription factors

E. prokaryotes have to worry about unpackaging the DNA for transcription, while eukaryotes have almost naked DNA not bound up by nucleosome

1 DNA sequences found in introns provide [A] amino acid sequence information.

[B] regulatory information.
[C] no known useful information.

[D] structure for the gene.
[E] alternative DNA splicing possibilities.

3. The TATA box is a(n)
[A] sequence close to the promoter region of many genes.
[B] square-shaped sequence.
[C] enhancer consensus sequence.
[D] activator sequence necessary for proper translation.
[E] None of the above

5. Regarding genes and gene expression, which of the following is not a difference between prokaryotes and eukaryotes
[A] Eukaryotic DNA does not contain a TATA box close to the initiation site as does prokaryotic DNA.

[B] In eukaryotes, RNA polymerase requires

'transcription factors'or initiation.

[C] Prokaryotic genes are often grouped together in

operons.

[D] In eukaryotes, the regulation of several genes at once requires common control elements in each of the genes.
[E] There is a diversity of eukaryotic polymerases that is reflected in the diversity of eukaryotic promoters.

10) In eukaryotic cells, a repressor

[A] is made of DNA.
[B] binds to the enhancer region to block transcription. [

C] is located both upstream and downstream from the promoter.
[D] binds to the operator to block RNA polymerase.

[E] binds to a silencer to reduce transcription rates.

Coordinated regulation of genes in eukaryotic cells [A] is the result of positioning the same regulatory sequence in front of each gene.
[B] results from all of those genes being under the control of one promoter.

[C] occurs because related genes all have the same

operons.
[D] occurs because enhancers cause DNA to bend.

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