Tag: chromosome

Questions Related to chromosome

In a chromosome the protein content is?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Nil

  2. Trace

  3. Half of DNA

  4. Same as DNA

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Correct Option: D

Kinetochore is?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Surface of centromere

  2. Trilaminar plate over centromere

  3. End of chromosome

  4. Constriction near chromosome end

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Correct Option: A
Explanation:
The centromere is the lighter staining region on the chromosome of a cell which appears as a constriction.
They are also known as a primary constriction or kinetochore.
The kinetochore is a proteinaceous structure that assembles at the surface of the centromere which forms the site for binding of spindle fibres during cell division.
So, the correct answer is 'Surface of centromere'.

Is chromosome are the chromosomes with _____________.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Identical sizes

  2. Identical arms

  3. Identical gene content

  4. Identical shapes

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Correct Option: A

Somatic chromosome number is 40.What shall be chromosome number in the cells seminiferous tubule ?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. 40

  2. 20

  3. 10

  4. 40 and 20

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Correct Option: B
Explanation:
Somatic cell is diploid (2n) in nature. It is given that the number of somatic chromosomes is 40. Seminiferous tubules contain haploid (n) spermatozoa. These spermatozoa are haploid in nature.
Hence, the number of chromosomes in the cells of seminiferous tubules will be 20.
Thus, the correct answer is '20.'

Separate identical copies of chromosomes are formed at the _______________.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. End of metaphase

  2. End of anaphase

  3. End of prophase

  4. End of zygotene

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Correct Option: A

A pericentric inversion in chromosome involves _______________.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. One arm of a chromosome

  2. Both the arms of a chromosome

  3. Two different chromosomes

  4. More than two chromosomes

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Correct Option: A

Is chromosomes are formed by.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Pairing of identical chromosomes

  2. Longitudinal splitting of Centromere

  3. Transverse division of Centromere

  4. Disjunction of bivalents

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Correct Option: A

Lamp brush chromosomes found in certain organisms are directly related to metamorphosis. Which one of the following statements in this regard is incorrect?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. These are very large chromosomes

  2. These are actively engaged in RNA and protein synthesis and accumulation

  3. Lamp brush loops recede and these become normal looking chromosomal parts looking chromosomal parts

  4. They are compactly packed and have very high DNA content

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Correct Option: A

$6$p $23$ in chromosome nomenclature indicates band number.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. $6$ in short arm of chromosome $23$

  2. $3$ in region $2$ of short arm of chromosome $6$

  3. $3$ in region $2$ of long arm of chromosome $6$

  4. $6$ in long arm of chromosome $23$

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Correct Option: A

Diagrammatic representations of a chromosome is known as ____________.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Homotype

  2. Idiotype

  3. Merotype

  4. Karyotype

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Correct Option: B
Explanation:
An ideogram is a diagrammatic representation of the karyotype that shows all of the pairs of homologous chromosomes in the nucleus. The pairs of chromosomes are lined up in order of size, so that the centromeres are aligned and the short arm is uppermost. An ideogram is a useful point of reference for analyzing mutations.
So the correct option is 'Idiotype'.