Monthly archives: February, 2015

Enzymes in Recombinant DNA Technology

Different kinds of specific enzymes are used in genetic engineering (recombinant DNA technology). These include lysing enzymes, cleaving enzymes, synthesizing enzymes, joining enzymes and alkaline phosphatase. • The palindromes in DNA are base pair sequences that are the same, when read forward (left to right) or backward (right to left), from a central axis of …

AIPMT PMT – Biotechnology – Principles and Processes

Biotechnology • The term biotechnology is derived from a fusion of biology and technology. Biotechnology means any technological application that uses biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use. • Berg is often considered “Father of genetic engineering”. He was awarded Nobel Prize in 1980. • …

AIPMT PMT Endocrine System MCQs for Medical Entrance Exams

New MCQs 1. Ca2+ level is controlled by (a) thyroid <b) parathyroid (c) both (a) and (b) (d) adrenal. 2. Mammalian thymus is mainly concerned with (a) regulation of calcium level (b) regulation of body growth (c) immunological functions (d) secretion of serotonin. 3. Which one of the following is proteinaceous in chemical nature? (a) …

Hormones of heart, kidney and gastrointestinal tract

(i) Heart The cells, called cardiocytes, of the atria secrete a peptide, atrial natriuretic factor (ANF) which decreases blood pressure. When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels. This reduces the blood pressure. (ii) Kidneys The kidneys secrete three hormones: renin, erythropoietin and calcitriol. Renin acts upon a …

Major Endocrine Glands and their Hormones

Human endocrine system includes the following glands. Hypothalamus (Supreme commander) Hypothalamus produces several neurogenic hormones and its target organ is pituitary. Hypothalamus is the basal part of diencephalon, forebrain and it regulates a wide spectrum of body functions. It contains several groups of neurosecretory cells called nuclei which produce hormones. These hormones regulate the synthesis …

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 …

Human Endocrine System

Cell function is broadly controlled by two mechanisms : nervous and endocrinal. 1. Neural control is due to the spread of depolarization through the nerve. It has rapid action (much shorter latent period) and it affects certain groups of cells for a short period. 2. Endocrinal control is by release of physiologically active substances called …

Protozoan Diseases

PROTOZOAN DISEASES • Protozoans are diverse group of eukaryotic, unicellular organisms. • Human diseases caused by protozoa are relatively few, but are individually of devastating consequences. Amoebiasis or Amoebic dysentery • Amoebiasis is a protozoan infestation of upper part of large intestine which is caused by monogenetic protozoan (having one host i.e., man) known as …