Chapter 10 Biology

Question 1

What does DNA do?

Answer 1

replicates, mutates and controls the cell through directing the synthesis of RNA and protein.

Question 2

DNA and RNA are both __?

Answer 2

nucleic acids.

Question 3

What is the sugar-phosphate backbone?

Answer 3

composed of nucleotides sugar and phosphate covalently bonded

Question 4

Section:The Genetic Code

Question 5

What are the 3 stop codons?

Answer 5

UAG, UAA, UGA

Question 6

the start transcribing signal is a nucleotide sequence called a ___?

Answer 6

promoter

Question 7

The first phase of transcripition, which is the attachment of RNA polymerase to the promoter and the start of RNA synthesis is called___

Answer 7

Initiation

Question 8

The second phase of transcription is___?

Answer 8

Elongation

Question 9

The third phase of transcription is ___? and RNA molecule detaches from DNA

Answer 9

Termination

Question 10

What is the terminator DNA

Answer 10

opposite of the promoter, tells when RNA polymerase needs to stop.

Question 11

What modifications happen to RNA in Eukaryotic cells?

Answer 11

addition of cap and tail; introns are removed; exons joined in;

Question 12

tRNA molecules must perform 2 tasks:

Answer 12

pick up appropriate amino acids and recognize the codons on mRNA

Question 13

Translation is also divided into what phases?

Answer 13

initiation, elongation, and termination