Genetic-02

In the semiconservative replication of DNA, the enzyme catalyzes the covalent extension of DNA chains at the 3’-OH termini of primer strands is............

In a particular eukaryotic chromosome (choose the best answer):

• heterochromatin and euchromatin are regions where genes make functional gene products (that is, where genes are active).

• heterochromatin is active, but euchromatin is inactive.

• heterochromatin is inactive, but euchromatin is active.

• both heterochromatin and euchromatin are inactive.

During E. coli DNA replication, enzyme that has 5’-to-3’ exonuclease function is:

• Polymerase I

• Polymerase III

• Helicase

• Ligase

During E. coli DNA replication, enzymes that bonds the 3’-OH end of a polynucleotide to a free nucleotide triphosphate are:

• Polymerase I

• Polymerase III

• SSB protein

• Primase

What is gene? Choose the correct answer:

• One-gene encodes for one-polypeptide

• A gene is a sequence of DNA or RNA which encodes for a molecule that has a function.

• One-gene encodes for one-enzyme

• Gene is heredity factor that determine a trait

Which one is incorrect about prokaryote gene structure?

• Contains regulatory regions and coding region

• The coding region contains introns and exons

• Coding region is polycistronic

• The coding region usually has more than one Open Reading Frame (ORF)

In prokaryotes, the mRNA contains the coding sequences for many polypeptides.

• Yes

• No

A ............. is a DNA sequence that can change its position in the genome, sometimes inducing or reversing mutations, and possibly altering genome size.

Genetic changes caused by Transposon are:

• insertional mutagenesis

• increase or decrease gene expression

• chromosomal mutations

• No genetic change occurs

What are the functions of DNA polymerase?

• catalyze the formation of a phosphodiester bonds

• finds the correct precursor dNTP

• Initiate new strand

• The direction of synthesis of the new DNA chain is only from 3’ to 5’.