Heredity B/Designer Genes C Question Marathon

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Heredity B/Designer Genes C Question Marathon

Post by Jim_R » August 28th, 2013, 8:16 pm

Question Marathon for Heredity B/Designer Genes C.
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Re: Heredity B/Designer Genes C Question Marathon

Post by ScienceOlympian » September 14th, 2013, 12:26 pm

Let's start out with an easy one. Fill in the blanks below.

1. Adenine bonds with thymine (in DNA), and guanine bonds with _______.
2, In RNA, Adenine bonds with _________.
3. What is the difference between a purine and a pyrimidine?
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Re: Heredity B/Designer Genes C Question Marathon

Post by strawberrygirl » September 14th, 2013, 12:43 pm

ScienceOlympian wrote:Let's start out with an easy one. Fill in the blanks below.

1. Adenine bonds with thymine (in DNA), and guanine bonds with _______.
2, In RNA, Adenine bonds with _________.
3. What is the difference between a purine and a pyrimidine?
1. Cytosine
2. Uracil
3. Purines have two rings, while pyrimidines have one ring, so purines are twice as wide as pyrimidines

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Re: Heredity B/Designer Genes C Question Marathon

Post by ScienceOlympian » October 26th, 2013, 10:31 pm

Lol, this is REALLY late, but correct! Your turn!
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Re: Heredity B/Designer Genes C Question Marathon

Post by Sciolapedia » November 13th, 2013, 4:50 pm

Its not my turn but since its been a couple weeks im just gonna ask the next question.

In what direction does Dna polymerase add the nucleotides in dna replication ?( 5 to 3 or 3 to 5)

Why does this cause a problem in the lagging strand? Because of this, what results in the lagging strand? :mrgreen: :mrgreen: :mrgreen: :mrgreen:

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Re: Heredity B/Designer Genes C Question Marathon

Post by jjetpack » November 13th, 2013, 8:08 pm

I always want to answer based on the parental strand instead of the newly synthesized one and say that it goes 3'->5', instead of 5'->3'(I think this is the answer you're looking for). 

The lagging daughter strand is running 3'->5', and the DNA polymerase can only go 5'->3', so the polymerase is forced to code short segments at a time, called Okazaki fragments

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Re: Heredity B/Designer Genes C Question Marathon

Post by Sciolapedia » November 14th, 2013, 3:11 pm

Yup your turn

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Re: Heredity B/Designer Genes C Question Marathon

Post by jjetpack » November 14th, 2013, 10:42 pm

Define an operon
Name the structural genes of the lac operon
What does the lacI (<-- uppercase i) gene do?

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Re: Heredity B/Designer Genes C Question Marathon

Post by brettt » November 29th, 2013, 9:04 am

jjetpack wrote:Define an operon
Name the structural genes of the lac operon
What does the lacI (<-- uppercase i) gene do?
An operon is a group of genes or a segment of DNA that functions in a coordinated matter consisting of an operator, promotor, and structural genes.

The structural genes of the lac operon are Lac Z (beta-galactosidase enzyme), Lac Y (permease enzyme), and Lac A (acetylase enzyme).

The lacI is the regulatory gene. It produces mRNA which in turn produces a repressor protein, which can then bind the the operator of the lac.
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Re: Heredity B/Designer Genes C Question Marathon

Post by Bramblestar » November 30th, 2013, 10:33 am

I have a question! What unwinds the DNA strand? What is a Replication Fork? And, what is an Okazaki Fragment?
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