Heredity B/Designer Genes C Question Marathon

[Jim_R]

Question Marathon for Heredity B/Designer Genes C.

[ScienceOlympian]

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?

[strawberrygirl]

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

[ScienceOlympian]

Lol, this is REALLY late, but correct! Your turn!

[Sciolapedia]

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?

[jjetpack]

I always hate this question... (Click to Show Hidden Text)

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

[Sciolapedia]

Yup your turn

[jjetpack]

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

[brettt]

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.

[Bramblestar]

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