Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Lecture #8
DNA Structures
| Question | Answer |
|---|---|
| What is DNA? | A double helix made of antiparallel nucleotides polymers. |
| what are the four criteria genetic must meet? | Information, Replication, Transmission, and Variation. |
| What are Rough Strains? | Appears rough and do no secrete capsules and infections are not fatal. |
| What are Smooth Strains? | Appears smooth and secrete capsules and infections are fatal. |
| Where are DNA found? | Inside the capsid. |
| What are DNA build of? | Nucleotides |
| What is the genome? | It is a complete complement of an organism genetic materials. |
| What are the 3 components of nucleotides? | 1. Phosphate 2. Nitrogenous Base 3. Pentose Sugar |
| What is the sugar in DNA and RNA? | DNA- deoxyribose RNA- ribose |
| What are two base that makes up purines? and for purimidines? | DNA base - 1. Purines - Adenine and Guanine 2. Purimidines - Cytosine and Thymine |
| What is the base in RNA for pyrimidines? | Unlike DNA, RNA has base Uracil instead of Thymine. |
| Differences in DNA and RNA? | RNA has ribose sugar instead of deoxyribose; has Uracil base instead of Thymine and RNA is usually single stranded. |
| What carbon is base and phosphate attach to? | Base - 1 carbon Phosphate - 5 carbon |
| What are the components that form the backbone of strand structure? | phosphate and sugars form the backbone of DNA strand and has directional from 5 to 3. |
| What the ratios of the nucleotides occur in? | T+C = A+G A=T G=C purines always base pair with pyrimidines |
| How many H bonds does A and T has? and G and C? | A and T has 2 Hydrogen bonds G and C has 3 Hydrogen bonds |
| How many base pairs are there per turn? | 10 base pairs occur per turn |
| Example of two DNA complementary strands | 5-GCGGATTT-3 3-CGCCTAAA-5 these two strands are ANTIPARALLEL |
| What is the major groove in the DNA strand? | It is where protein binds and effect gene expression. |
| DNA Structure | It is a redundancy with a profound purpose strand DNA is susceptible to both chemical and physical damage. The complementary will used to fix the damage. It doesn't matter which strand is damage. |
| What is the purpose of Helix? | It prevents the DNA from becoming tied into knots. |
| Denaturation of DNA | breaking down DNA structure and the melting temperature is directly proportional to base composition. |
| Renaturation of DNA | kinetics of renaturation is related to concentration single vs multi-copy genes *the higher in concentration of the DNA, the faster single stranded molecules reanneal. |
| What are the three levels of DNA composition? | 1. DNA wrapping - DNA wrapped around histones to form nucleosome 2. 30-nm fiber - shorten length another 7 fold 3. Radial Loop Domains - interaction between 30nm fibers and nuclear matrix |
| What happens when cell gets ready to divide? | Chromosomes are more compacted, euchromatin is lightly packed, and heterochromatin is much more compacted. |
Created by:
mung44
Popular Biology sets