HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Biology

cDNA means ______.

The nervous system of mammals uses both electrical and chemical means to send signals via neurons. Which part of the neuron receives impulse?

___________ is a neurotransmitter.

The supporting cells that produce myelin sheath in the PNS are _________.

Receptors for protein hormones are located ________.

Match the organism with the type of nervous system found in them.

Short answer question

List the properties of the nerve fibres.

Answer the following.

Complete the table.

Long answer question

Draw the neat labelled diagram of Multipolar Neuron.

Recombinant protein .................. is used to dissolve blood clots present in the body.

Give the role of Ca⁺⁺ ions in the transfer of the recombinant vector into the bacterial host cells.

In the process of rDNA technology, if two separate restriction enzymes are used to cut vector and donor DNA then which problem will arise in the formation of rDNA or chimeric DNA? Explain.

Explain the steps in process of rDNA technology with suitable diagrams.

Short Answer Question:

Differentiate between Arithmetic and Geometric growth.

Choose the correct alternative.

_______ muscles contract when the external intercostal muscles contract.

Very short answer question.

Why is a gas exchange very rapid at the alveolar level?

Short answer question.

Why is it advantageous to breathe through the nose than through the mouth?

Distinguish between open circulation and closed circulation.

Long answer question:

Smita was working in a garage with the doors closed and automobile's engine running. After some time she felt breathless and fainted. What would be the reason? How can she be treated?

The resting potential of a neuron is ______.