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Many ribosomes may associate with a sing...

Many ribosomes may associate with a single mRNA to form mutiple copies of a poolypeptide simultaneously. Such strings of ribosomes are termed as

A

Polysomes

B

Plastidomes

C

Polyhedral bodies

D

Nucleosomes

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[A]: DNA code is copied in the synthesis of tRNA. [R]: tRNA moves out of the nucleus and after attaching on ribosomes form the template

Assertion (A) : DNA code is copied in the synthesis of m-RNA. Reason ( R ) : t-RNA moves out of nucleus and after attaching on ribosomes form the template.

Knowledge Check

  • Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

    A
    Polysome
    B
    Polyhedral bodies
    C
    Plastidome
    D
    Nucleosome

  • Several ribosomes may attach to a single mRNA and form a chain called

    A
    Polysome
    B
    Polyribosome
    C
    Phagosome
    D
    Both A and B

  • A complex of ribosomes attached to a single strand of mRNA is known as

    A
    Okazaki fragment
    B
    Polymer
    C
    Polyribosome
    D
    Polypeptide

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    The following features occur during protein synthesis: (a) Movement of mRNA from the nucleus into the cytoplasm, where it binds to the ribosomes (b) Formation of tRNA-amino acid complex (c) Transcription of specific segments of DNA into mRNA molecules in the nucleus (d) Binding of N-terminal amino acid, methionine tRNA to the 'P' site of the ribosome. The tRNA anticodon 'pairs with AUG on mRNA' (e) Formation of peptide bond between first and second amino acids at the A site (f) Release of the complete polypeptide chain from mRNA and the ribosomes (g) Migration of dipeptide to form a tripeptide and then a polypeptide The correct order of events is:

    Geometry of organic compound is often described in terms of the valence shell electron pair repulsion theory. The VSEPR model rests on the premise that an electron pair, either bonded pair or an unshared pair, associated with a particular atom will be as far away from the atom's other electron pairs as possible. The tricoordinate carbon atoms of an alkene or carbonyl group also form bonds with angles near 120^(@) . In these compounds, unsaturated double bonds have two electron pairs-those of the sigma and pi bonds. Repulsion by these two pairs are some what greater than those between single bonds, so that deviation from exact 120^(@) trigonal geometry is observed. Another factor which has important influence on shapes is non bonded repulsion between the atoms within the molecule. Such repulsion is also referred to as steric effects. Select the correct sequence of indicated bond angles.

    Geometry of organic compound is often described in terms of the valence shell electron pair repulsion theory. The VSEPR model rests on the premise that an electron pair, either bonded pair or an unshared pair, associated with a particular atom will be as far away from the atom's other electron pairs as possible. The tricoordinate carbon atoms of an alkene or carbonyl group also form bonds with angles near 120^(@) . In these compounds, unsaturated double bonds have two electron pairs-those of the sigma and pi bonds. Repulsion by these two pairs are some what greater than those between single bonds, so that deviation from exact 120^(@) trigonal geometry is observed. Another factor which has important influence on shapes is non bonded repulsion between the atoms within the molecule. Such repulsion is also referred to as steric effects. Which compound has bond angles nearest to 120^(@) ?

    Geometry of organic compound is often described in terms of the valence shell electron pair repulsion theory. The VSEPR model rests on the premise that an electron pair, either bonded pair or an unshared pair, associated with a particular atom will be as far away from the atom's other electron pairs as possible. The tricoordinate carbon atoms of an alkene or carbonyl group also form bonds with angles near 120^(@) . In these compounds, unsaturated double bonds have two electron pairs-those of the sigma and pi bonds. Repulsion by these two pairs are some what greater than those between single bonds, so that deviation from exact 120^(@) trigonal geometry is observed. Another factor which has important influence on shapes is non bonded repulsion between the atoms within the molecule. Such repulsion is also referred to as steric effects. Which among the following is correct about the indicated bond angles?

    Geometry of organic compound is often described in terms of the valence shell electron pair repulsion theory. The VSEPR model rests on the premise that an electron pair, either bonded pair or an unshared pair, associated with a particular atom will be as far away from the atom's other electron pairs as possible. The tricoordinate carbon atoms of an alkene or carbonyl group also form bonds with angles near 120^(@) . In these compounds, unsaturated double bonds have two electron pairs-those of the sigma and pi bonds. Repulsion by these two pairs are some what greater than those between single bonds, so that deviation from exact 120^(@) trigonal geometry is observed. Another factor which has important influence on shapes is non bonded repulsion between the atoms within the molecule. Such repulsion is also referred to as steric effects. Select the correct sequence of indicated bond angles.

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