Class 12 Biology - Chapter Biotechnology Principles and Process NCERT Solutions | Can you recall meiosis and indicate at w
Can you recall meiosis and indicate at what stage a recombinant DNA is made?
Meiosis is a process that involves the reduction in the amount of genetic material. It is two types, namely meiosis I and meiosis II. During the pachytene stage of prophase I, crossing over of chromosomes takes place where the exchange of segments between non-sister chromatids of homlogous chromosomes takes place. This results in the formation of recombinant DNA.
More Questions From Class 12 Biology - Chapter Biotechnology Principles and Process
- Q:- Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
- Q:- What would be the molar concentration of human DNA in a human cell? Consult your teacher.
- Q:- Do eukaryotic cells have restriction endonucleases? Justify your answer.
- Q:- Describe briefly the followings:
(a) Origin of replication
(b) Bioreactors
(c) Downstream processing - Q:- Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?
- Q:- Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?
- Q:- Explain briefly
(a) PCR
(b) Restriction enzymes and DNA
(c) Chitinase - Q:- From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?
- Q:- Discuss with your teacher and find out how to distinguish between
(a) Plasmid DNA and chromosomal DNA
(b) RNA and DNA
(c) Exonuclease and Endonuclease - Q:- Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following base-pair rules.
Popular Questions of Class 12 Biology
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- What do you think is the significance of reproductive health in a society?
- Q:- Mention the advantages of selecting pea plant for experiment by Mendel.
- Q:- Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. - Q:- Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- Explain in brief the role of animal husbandry in human welfare.
- Q:- Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?
Recently Viewed Questions of Class 12 Biology
- Q:-
Why is the Human Genome project called a mega project?
- Q:- Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).
(a) Ovary _______________
(b) Anther _______________
(c) Egg _________________
(d) Pollen__________________
(e) Male gamete _______________
(f ) Zygote ___________________ - Q:- Explain what is meant by metastasis.
- Q:- Give three hypotheses for explaining why tropics show greatest levels of species richness.
- Q:- Name the three important components of biodiversity.
- Q:- If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.
- Q:- Write important features of a sedimentary cycle in an ecosystem.
- Q:- When a cross in made between tall plants with yellow seeds (Ttyy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be (a) Tall and green. (b) Dwarf and green.
- Q:- List all the wastes that you generate, at home, school or during your Trips to other places, could you very easily reduce? Which would be Difficult or rather impossible to reduce?
- Q:- Outline salient features of carbon cycling in an ecosystem.
8 Comment(s) on this Question
Thanks it's really helpful.
very nice ..thanks alot
really Amazing for students and an easy way to understand
This is a better way to defined.. And helpful for all of us..that\'s why thanks a lot..
Better way of dealing conceptual answer
yessssss v good helping site thanx a lot
really answers are very short refined ,which is quite helpful to teacher as well as students
gud helping a lot.......... thanku very much
- All Chapters Of Class 12 Biology
- All Subjects Of Class 12