Questions

Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.

The antigen-antibody immunological reaction is used to be regarded as typical of immunological responses. Antibodies are proteins synthesized by specialized cells called plasma cells, which are formed by lymphocytes (cells from the lymph system) when an antigen, a substance foreign to an organism's body, comes in contact with lymphocytes. Two important manifestations of antigen-antibody immunity are lysis, the rapid physical rupture of antigenic cells and the liberation of their contents into the surrounding medium, and phagocytosis, a process in which antigenic particles are engulfed by and very often digested by macrophages and polymorphs. The process of lysis is executed by a complex and unstable blood constituent known as complement, which will not work unless it is activated by a specific antibody; the process of phagocytosis is greatly facilitated when the particles to be engulfed are coated by a specific antibody directed against them.

What happens when an antigen comes in contact with lymphocytes?

In the following question, out of the four alternatives, select the word opposite in meaning to the word given.

Melody

If cash reserve ratio decreases, credit creation will _______.

Calculate a country's GDP if for the year, consumer spending is $400 million, government spending is $150 million, investment by businesses is $80 million, exports are $35 million and imports are $40 million.

In which month does the Earth's Perihelion position occur?

The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options

P: Very seldom do we actually go out and do something, which is beneficial to the society without thinking of our own side benefit of it.
Q: This is something that we have been falling short of.
R: Every society must develop in its people a social responsibility.
S: We are very individualistic and don’t relate ourselves to our society as such.

Name the Russian chemist who stated that the properties of elements are a periodic function of their atomic masses?

Which of the following represents the pair of sex chromosomes in women?