What is a vector in biotechnology? How does a plasmid vector work?

WHAT IS A VECTOR IN BIOTECHNOLOGY? Biotechnology is divided into two words- biology and technology which means we use different techniques to improve our health and environment. How can we use these techniques??? Answer to this in biotechnology is genetically manipulating microorganisms and for genetically manipulation of microorganisms we need a vector. Thus, vector is […]

BOTANY

Define pollination. How does it differ from fertilisation? Pollination is defined as the transfer of pollen grains from the anthers to the stigma. Fertilisation is the fusion of the nuclei of two dissimilar male and female gametes. Pollination results in germination of pollen grains, formation of pollen tubes and entry of pollen tube inside the […]

ZOOLOGY

Which animal has the largest sperm ? Compared to the organism body size ( in terms of absolute size), the sperm of several species of Drosophila (the fruit fly) appear to be the largest near about 1 cm in length. Most of the length in these cells is made up of the tail, which normally […]

TYPE OF MULTIPLE CHOICE QUESTIONS

Select the statement(s) that apply to both DNA replication and RNA transcription. Separation of the DNA strands (“unzipping”) A requirement for a primer Directionality of synthesis Base-pairing of complementary nucleotides Energy to drive the process is provided by triphosphate nucleotides   Answer : All statements are common to both DNA replication and transcription except : […]

ROLE OF HORMONES

OVERVIEW: Hormones are special chemical messengers in the body that are produced in the endocrine glands. These messengers control major body functions, from simple basic needs like hunger to complex systems like reproduction, and even the emotions and mood. LIST OF HORMONES ROLE IN HUMAN BODY : 1) Melatonin – Think of melatonin as your […]

GREENHOUSE EFFECT : THREE KEY GREENHOUSE GASES AND HOW DO THEY DIFFER IN ATMOSPHERIC LIFETIMES

Except water vapour, the 3 key greenhouse gases are carbon dioxide (CO2), methane (CH4) and the halocarbons or CFCs (gases containing fluorine, chlorine and bromine). HOW DO THEY DIFFER IN ATMOSPHERIC LIFETIMES : The lifetime of CO2 is most difficult to determine, because there are many processes that remove CO2 from the atmosphere. Between 65% […]