DNA/RNA related definitions Flashcards
1
Q
Telomere
A
Repetitive DNA at each end of a chromatid. Prevents chromosomal deterioration during replication.
2
Q
How telomeres function
A
Prevent chromosomal deterioration. During replication, extreme ends of telomere are not copied. Telomere gets shorter. Cells stop dividing when telomeres are too short.
3
Q
Intron
A
Non-coding sequence of DNA within gene (intervening sequence) that is cut out by enzymes when RNA is made into mature mRNA.
4
Q
Exon
A
Coding sections of RNA transcript or DNA encoding it (are translated into proteins)
5
Q
Nucleosome
A
DNA molecule wound around 8 histone proteins
6
Q
Which bases are purines?
A
A, G
7
Q
Difference between purine and pyrimidine
A
Purine has 2 rings (in pentose sugar), pyrimidine has 1
