Question

A) An Operon is:?

1- A gene that affect another gene transcription.
2. A gene coding for a metabolic pathway.
3. A protein that blockgene expression.
4. A set of genes under the control of one promoter.

B )- In bacteria the Lac Operon genes code for proteins that break down.?
1- Arabinose
2- Lactose
3- Galactose
4- Glucose

C )mRNA processing involves removal of .......?
1- Introns
2- The poly-A tail
3- The 5' cap
4- Exons

D ) For cells with the Lac Operon to what does the lactose bind?
1 ) the operator
2 ) the terminator
3 ) the promoter
4) the repressor

E) which of THESE steps is found in eukaryotic gene expression but not in prokaryotic gene expression?
1- translational
2- alternative splicing
3- transcriptional

F) Which of the following binds to the piece of DNA called the enhancer?
1- the silencer
2- the activator
3- the promoter
4- the operator

G) The repressor binds to a piece of DNA called the What.
1- the operator
2- the silencer
3- the activator
4- the enhancer

H) Skin cells differ from nerve cells they...?
1- Express different genes
2- contain different genes
3. have different chromosomes
4. have different ribosomes

I) Whic of the following is paieed incorrectly?
1- beta- galactoside cleaves (cuts) lactose yo produce glucose and galactose
2- lactose repressor shuts down transcription of lac operon
3- Galactoside permease membrane transport protein allows import of lactose to cell

J) Dna is organized un nucleosome which are DNA wrapped tighty around ?
1- ribosomes
2- histones
3- Rna polymerase
4- operators

Answer 1

A) 2. A gene coding for a metabolic pathway.

B) 2. Lactose

C) 1. Introns

D) 4. the repressor

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