HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

What is the role of Taq-polymerase in PCR technology?

Bt-cotton shows adverse effect on the population of which butterfly?

Define vector? write any two examples,

Define biotechnology? Which are the basic principles and process of biotechnology?

What is gene cloning? Explain different tools used for it.

Explain types of enzymes used in biotechnology?

What is Recognition sequence? Explain in brief.

What is PCR? Explain different steps involved in it.

A medicinal plant Rauwolfia vomitoria shows variations in concentration of reserpine from location to location. What type of level of biodiversity is this?

Give any four factors that favour high speciation at lower altitudes.

The movement of diaphragm, intercostal muscles and rib cage helps in ______.

Fill in the blanks with the help of chart.

With the help of chart identify and write the function of any four leucocytes.

Type	Leucocytes	Name of cell	Function
Granulocytes
Agranulocytes

Explain the different properties of water.

DNA polymerase enzyme used in PCR is isolated from ____________ bacteria.

Which one of the following is not a fungal disease?

Annealing step of PCR operates at ______ °C.

Name the plant disease caused by Agrobacterium tumefaciens.

Which of the following is the correct recognition sequence of restriction enzyme Eco RI?

Observe the given sequence of nitrogenous bases on a DNA fragments and answer the following questions:

5' - CAGAATTCTTA - 3'
3' - GTCTTAAGAAT - 5'

1. Name a restriction enzyme which can recognise this DNA sequence.
2. Write the sequence after digestion.
3. Why are the ends generated after digestion called sticky ends?