Q1(NEET 2021): A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is:
(a) degenerate primer sequence
(b) Okazaki sequences
(c) palindromic nucleotide sequence
(d) poly(A) tailsequence
Q1: The linking of antibiotic resistance gene with the plasmid vector became possible with
(a) DNA polymerase
(b) exonucleases
(c) DNA ligase
(d) endonucleases
Q1. What are Transgenic crops?
Answer: Genetically modified crops that contain or express one or more useful foreign genes are called transgenic crops.
Q2. What are transgenic animals? Give an example.
Answer: Animals manipulated with the foreign gene and have the ability to express it are transgenic animals. e.g. Rosie, a transgenic cow produced milk containing human alpha-lactalbumin.
Q3. What is BT toxin?
Answer: Bt toxin is an intracellular crystalline protein. It exists as an inactive protoxin that once ingested by an insect, gets activated, binds to the surface of midgut epithelial cells. This causes cell swelling and lysis, leading to the death of an insect.
1. Swedish botanist Carolus Linnaeus established binomial nomenclature.
2. Caper Bauhin expressed proposed binomial nomenclature for the first time
3. In binomial nomenclature, the first word is a generic name having first letter capital and second word is a specific epithet having first letter. e.g. Homo sapiens, Mangifera indica
4. After end of biological name, the name of author is written in abbreviated form who gave the name to that organism.
5. Both the words of a biological name when handwritten are separately underlined and when printed are typed in italics to indicate their Latin origin and also give respect to the name.
CBSE Class 11 Biology - The Living World
Q1: Do five kingdom classification include viruses, viroids and lichens?
Answer: Five kingdom system of classification do not includes Virus, Viroids and Lichens.
Q2: What is a virus? What is its structure?
Answer: Viruses are non-cellular organisms having inert crystalline structure outside the living. A virus is a small particle consisting of a nucleic acid core surrounded by a protein coat; in order to reproduce, a virus must infect a living cell.
