Question

1.What are the building blocks of nucleic acids?

2.What are the 3 components of these building blocks ?

3.How is RNA different from DNA? Give three specific reasons.

a._______________________________________________

b._______________________________________________

c._______________________________________________

4.What are the three types of RNA found in a cell, what is the function of each and are these translated?

RNA	Function	Translated?
a.
b.
c.

5.What is a codon?

a. Anticodon?

Each of the following questions asks you to work out a sequence of nucleotide bases. When necessary, please use the genetic code chart in the text.

The following is a DNA sequence found in the template strand of a gene.

TACGGTCGCTTTGGCAAGCCCTAAGATATT

6.Determine the mRNA sequence that would be produced as a result of transcription of this gene.

7.Determine the amino acid sequence that is encoded by the transcribed mRNA.

8.What would happen to the above DNA strand if Cytosine was INSERTED at spot 12? What is this called?

Answer 1

1. nucleotide

2. nitrogenous base, a pentose sugar, phosphate

3.

a. RNA has ribose sugar, in DNA deoxyribose sugar is present

b. Uracil base is present in RNA, in DNA thymine is present

c. it is generally single-stranded and non-genetic except some viruses.

4.

RNA	Function	Translated?
mRNA	carries genetic information from DNA	Yes
tRNA	transfer amino acid during protein synthesis	no
rRNA	makes up the bulk of ribosome	no

5. every 3 continuous bases of mRNA.

a. anticodon region of a transfer RNA is a sequence of three bases that are complementary to a codon in the messenger RNA.

6.

DNA sequence T A C G G T C G C T T T G G C A A G C C C T A A G A T A T T

mRNA Sequence A U G C C A G C G A AA C C G U U C G G GA U U C U A U A A

7.

AUG CCA GCG AAA CCG UUC GGG AUU CUA UAA

Met pro ala lys pro phe gly ile leu stop

8. it may be a non-functional protein.

frameshift mutation