T cells or B cells that are capable of responding to a specific antigen by binding to it with antigen-specific receptors that appear on the lymphocyte’s surface are considered ________.

Consider a blue, a yellow and a red main sequence star. Select one of the following:

Using the Figure below, match the following: Structures that increase the absorptive area of the small intestine  

The main source of Sun’s energy is

An immediate and intense type I reaction that can be treated with antihistamines is characteristic of __________. 

A star which is 50 times as massive as our Sun is more likely to undergo

The particles arriving on earth from nuclear reaction in the center of our sun include

The principal enzyme for breaking down carbohydrates is ________.

Necessary for Vitamin B12 absorption, ________ is/are secreted by ________ cells.

The corona of our Sun becomes visible during