Category «Biochemistry»

P – BLOCK ELEMENTS – 13

1) Which of the following is a good conductor of electricity ? a) Antracite b) Diamond c) Charcoal d) Graphite 2) Which of the following is a semiconductor ? a) C b) Pb c) Ge d) Sn 3) The inert form of carbon is a) Diamond b) Graphite c) Coal d) Charcoal 4) Synthesis gas …

JEE Physics Multiple choice questions

This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d) out of which ONLY ONE is correct. 1. The input resistance of a silicon transistor is 100 W. Base current is changed by 40 µA which results in a change in collector current by 2 mA. This transistor is used …

Role of hormones as messengers and regulators

Hormones as messengers [Hypothalamo-hypophysial (pituitary) Axis] Hypothalamus is a part of the fore brain. Its hypothalamic nuclei — masses of grey matter containing neurons, are located in the white matter in the floor of the third ventricle of the brain. The neurons (neurosecretory cells) of hypothalamic nuclei secrete some hormones called neurohormones (releasing factors) into …

Mendelian Genetics and Heredity

Genetics and Heredity It is the branch of biological sciences which  deals with the transmission of characteristics from  one generation to the next and also the action of  hereditary units called genes as they bring about the  . characteristics which they control. Modern genetics is concerned with the study of  genes. The term genetics was …