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    • Posted by Sachin Kumar Yadav 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 6 years, 11 months ago

    DNA is present in the nucleus not in the cytoplasm just to protect them from various enzymes in the cytoplasm which make it difficult to reach the cell membrane to pass through it. Also DNA is a hydrophilic molecules cannot easily pass through the cell membranes, unlike hydrophobic molecules. Cell membrane is made up of phospholipids and cholesterols which makes the DNA (hydrophilic molecule) molecule impermeable.

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    • Posted by Nitya Jaiswal 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 5 months ago

    An antibody, also known as an immunoglobulin, is a Y-shaped structure which consists of four polypeptides — two heavy chains and two light chains. ... Fab fragment is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain. Antibodies are immune system-related proteins called immunoglobulins. Each antibody consists of four polypeptides– two heavy chains and two light chains joined to form a "Y" shaped molecule. The amino acid sequence in the tips of the "Y" varies greatly among different antibodies.

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    • Posted by Ritik Khatri 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Chelsea Chawla 6 years, 11 months ago

    Plasmodium

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    • Posted by Saranna Hansda 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Aditi Bhat 6 years, 11 months ago

    Contact inhibition is a process in which the dividing cells when come in contact with the nearby cells , they stop dividing . Contact inhibition is generally absent in cancerous cells due to which excessive growth of cells occurs.

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    • Posted by Purushottam Jee 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sangitaben Patel 6 years, 11 months ago

    The main function of PNS is to collect different stimuli(signals) and send it to the CNS....also transmitting motor responses to different parts of the body from CNS

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    • Posted by Anindya Priyadarshini 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 6 years, 11 months ago

    Mating of superior male of one breed and superior female of another breed is called cross breeding. Desirable qualities of two breeds can be combined by this process. Hisardale is a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Marino rams.

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    • Posted by Adarsh Kumar 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 5 months ago

    A white-eyed female fruit fly is crossed with a red-eyed male. Red eyes are dominant and X-linked. All of the females will have red eyes; half of the males will have red eyes, and half of the males will have white eyes. Since the X-chromosome is bigger and contains more genes than the Y-chromosome, most ***-linked traits are X-linked traits. Wild-type fruit flies have dark red eyes, but there are recessive alleles of this eye colour gene (called the white gene) that cause individuals to have white eyes.

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    • Posted by Hema Bisht 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Deepesh Chaudhary 6 years, 11 months ago

    Reborn to nhi kh skte but han there are some scientists who have discoverd a virus who perform functioning but that human cant talk or walk. There is one movie also on the same topic.

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    • Posted by Nazim Hussain 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Ambuj Mishra?? 6 years, 11 months ago

    *Insulin contains two polypeptide chaims- chainA and chainB linked by disuphide bridge. * In mammals,insulin is synthesised as a pro-hormone(that needs to be processed to become mature and functional hormone). It contains an extra strecg called C peptide. *C peptide is absent in mature insulin and iz removed during maturation into insulin

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    • Posted by Arsh Dhillon 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 0 answers
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    • Posted by Brij Mohan 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sangitaben Patel 6 years, 11 months ago

    In leading strand there occurs no problem with the replication as polymerisation occurs in the direction of replication fork. But in lagging stand, the direction of polymerisation is opposite to the direction of replication fork and DNA cant polymerise continuosly as DNA doesnt show denovo synthesis, RNA primer has to come repeatedly to form 10-15 nucleotides as a starting material to DNA. DNA then forms some nucleotides from this starting material and then after forming some nucleotides it stops. Then again RNA primer comes and form 10-15 nucleotides....this process continues. The small segments of nucleotides formed by DNA are called okazaki segments. They are joined by DNA ligase after the polymerisation is completed.

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    • Posted by Ojas Singla 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Lavanya Balasubramanian 6 years, 11 months ago

    The growth, development and adoption of new varieties of oilseeds

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    • Posted by Priyanshu Gupta 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Danush Sk 6 years, 11 months ago

    It also caused inbreeding depression.

    1Thank You

    Yogita Ingle 6 years, 11 months ago

    Two limitations of traditional breeding technique that led to promotion of micro-propagation are :
    i. It was difficult to maintain purity of offspring produced by traditional breeding techniques.
    ii. The traditional breeding methods took a long time and did not produce many offsprings.

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    • Posted by Sneha Bhosale 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Jayant Tehlan 6 years, 11 months ago

    Yes, because the shedded portion of endometrium absorbed inside the body unlike humans.

    1Thank You

    Priyanshu Gupta 6 years, 11 months ago

    See on Ncert12th page 9...........8 9and 10th line from the ? down of the page

    1Thank You

    Priyanshu Gupta 6 years, 11 months ago

    Not aproper question

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    • Posted by Ambuj Mishra?? 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Ambuj Mishra?? 6 years, 11 months ago

    So the answer will be stanley cohen and herbert boyer?

    2Thank You

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    • Posted by Amit Mittan 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Kalas Sahu 6 years, 11 months ago

    Cow, sheep

    1Thank You

    Tannya Pande 6 years, 11 months ago

    Cow,sheep , rats , deers ,dogs,such animals exibit oestrous cycle .

    0Thank You

    Christin Mathew 6 years, 11 months ago

    All animals except primates

    1Thank You

    Christin Mathew 6 years, 11 months ago

    Cat

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    • Posted by Sona Rathee 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Anuradha Sharma 6 years, 11 months ago

    And in pregnancy the egg get fertilised due to which menstruation not occur.................. I hope you understand ???

    4Thank You

    Anuradha Sharma 6 years, 11 months ago

    Because menstruation is indicator of unfertilised egg

    1Thank You

    Akshita Tank 6 years, 11 months ago

    Menstrual cycle is absent in pregnant women because the egg released from the ovary is fertilised by the sperm and zygote us formed. furthur zygote converts into multicellular embryo. The thick lining of uterus is used up in providing protection to embryo so blood vessels and thick lining of endometrium is not shed off. Hence menstrual cycles is absent in pregnant women

    2Thank You

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    • Posted by Aditya Kumar 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Biswashruti Mayee Pradhan 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 5 months ago

    Antibiotics are used to reduce harmful bacteria in the body. Antibiotics can also reduce friendly bacteria in the body. Lactobacillus is a type of friendly bacteria. Taking antibiotics along with Lactobacillus can reduce the effectiveness of Lactobacillus. Antibiotics are taken during illness act as a double-edged sword killing not only the disease-causing microorganisms but also disrupting the normal microbial balance of the gut. Lactobacilli show varied response towards different antibiotics.

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    • Posted by Sanoj Kumar 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Biswashruti Mayee Pradhan 6 years, 11 months ago

    Lactobacillus

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    • Posted by Mike Singh 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Vishali Raina 6 years, 11 months ago

    Enzyme that digest lipids.

    2Thank You

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    • Posted by Ambuj Mishra?? 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Aditi Bhat 6 years, 11 months ago

    Theory of Panspermia suggests that life on earth originated with the help of small spores that came from some part of the universe.

    2Thank You

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    • Posted by Ambuj Mishra?? 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Anubha Sinha 6 years, 11 months ago

    2nd attack by the same bacteria ensures anamnestic response if the immune system is good

    1Thank You

    Gaurav Seth 6 years, 11 months ago

    Answer: During vaccination, inactivated or weakened pathogen introduced in the body. The antibodies produced against these antigens would neutralise the pathogen agents. This is a method to ensure an anamnestic response in humans

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    • Posted by Rumaisa Zubairi 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Anuradha Sharma 6 years, 11 months ago

    Bio= living

    0Thank You

    Anubha Sinha 6 years, 11 months ago

    Study of livig organisms is known as biology

    0Thank You

    Nitin Yadav 6 years, 11 months ago

    The living habitats around us is biology

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    • Posted by Ansh Pal 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Tannya Pande 6 years, 11 months ago

    Malnutrition

    0Thank You

    Anubha Sinha 6 years, 11 months ago

    Ecology

    0Thank You

    Dev Joshi 6 years, 11 months ago

    Population interaction

    0Thank You

    Nitin Yadav 6 years, 11 months ago

    Bioyechnology

    0Thank You

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    • Posted by Pooja Choudhary 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Dev Joshi 6 years, 11 months ago

    Gel electrophoresis

    1Thank You

    Shama Shama Sheikh 6 years, 11 months ago

    Electrophoresis

    2Thank You

    ANSWER

    • Posted by Mathew Ev 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Anubha Sinha 6 years, 11 months ago

    Type Epochs Eohippes Eocene Mesohippes oligocene Merychippes miocene Pilohippes pliocene Equus pleistcene

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    • Posted by Prisha Sharma 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Harisha Goothy 6 years, 11 months ago

    Sample paper 2019 has many pedigree questions

    3Thank You

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    • Posted by Surinder Singh 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Anubha Sinha 6 years, 11 months ago

    Backcross is a type of cross in which f1 individuals are crossed with any of their parents ,it is of two types outcross- when is crossed with dominant parent and another one is test cross -when is crossed with recessive parent

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    • Posted by Ruhi S 6 years, 11 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Aanchal Verma 6 years, 11 months ago

    Sickle-cell anaemia is caused by the substitution of glutamic acid(glu) by valine(val) at the 6th position of beta globin chain of haemoglobin molecule which is due to single base substitution of beta globin gene from GAG to GUG.

    1Thank You

    Pragya Gupta 6 years, 11 months ago

    Sickle cell animea is problem in whih person blood cells red get bend abnormal

    1Thank You

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