Why does DNA use Thymine not Uracil? Please answer this question in regards to possible threats of DNA mutation or damage. That is, how does the quality of DNA having Thymine provide it with an adequate defense against DNA damage and mutation.

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Patrina SchowalterLv2

29 Sep 2019

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I just wanted to understand the basic steps behind thereplication of the lagging strand of DNA:

Have helicase unwind it first
DNA Primase lays down RNA primers in fragments, called Okazakifragments
DNA polymerase III goes through and corrects all the mistakes(essentially replace the Uracil with Thymine)
DNA polymerase I goes through and removes RNA primer
DNA ligase hooks up each of the 5' to 3' end fragments

Is this the correct order of steps? If so, does the leadingstrand need any RNA primer or does the DNA polymerase just startand go to the end without any help? Thanks

1. Translate the following mRNA strand: AUG ACG GGU AGA UGG UGA.

2. Transcribe the following strand of DNA: AGT CCA GTA

_____3. Which of the following is the building block that will be used to make a nucleic acid?

(a) amino acid (b) glucose (c) triglyceride (d) glycerol (e) nucleotide

_____4. Which of the following nitrogenous bases is NOT found in DNA?

(a) adenine (b) thymine (c) uracil (d) cytosine (e) guanine

_____5. Adenine will base pair with:

(a) thymine (b) adenine (c) cytosine (d) guanine

_____6. What is the name of the process that will copy DNA into RNA?

(a) transcription (b) translation (c) replication (d) mitosis

_____7. Using the genetic code in this lab, what does the codon CCU code for?

(a) met (b) stop (c) leu (d) pro (e) arg

rubyspider503

1=Did the suntan lotion(s) appear to have any protective effect on UV-induced mutation? What was the effect of SPF on the results? Is it consistent with the SPF on the container? Explain account the differences observed upon longer exposure

2= What is the relationship between DNA damage, mutation and cell death? Why does exposure to sun damage your skin? Explain.

3= Do you see colonies on the control plate? If so, why? If not, why do you think I asked this question?