Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement:

1.	The enzyme recognizes a specific palindromic nucleotide sequence in the DNA
2.	The enzyme cuts DNA molecules at an identified position within the DNA
3.	The enzyme binds DNA at specific sites and cuts only one of the two strands
4.	The enzyme cuts the sugar-phosphate backbone at specific sites on each strand

DNA precipitation, out of a mixture of biomolecules, can be achieved by treatment with:
1. Chilled chloroform
2. Isopropanol 
3. Chilled ethanol
4. Methanol at room temperature

Which of the following equipment is essentially required for growing microbes on a large scale for the industrial production of enzymes?

The first type II restriction endonuclease whose functioning depended on a specific DNA nucleotide sequence was:
1. EcoRI

2. HindII

3. SmaI

4. BamHI

The following palindrome is recognized by the restriction enzyme:

1. BamHI

2. EcoRI

3. HindII

4. PstI

Which of the following does not have the ability to replicate within bacterial cells independent of the control of chromosomal DNA?
1. Plastid

2. Bacteriophages

3. BAC

4. Plasmid

Restriction endonuclease:

1. cuts the DNA molecule randomly

2. cuts the DNA molecule at specific sites

3. restricts the synthesis of DNA inside the nucleus

4. synthesis DNA

In the screening process, clones that metabolize X-gal turn

1. yellow

2. orange

3. blue

4. colorless

In attempts to confer special characteristics upon plants, genetic engineers find Agrobacterium tumefaciens to be an effective vector for use with

1. corn

2. rice

3. wheat

4. soy beans

Restriction endonucleases are enzymes which: