Tag: cell: size and differentiation

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Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

Chromosomes having equal or almost equal arms are called

  1. Metacentric

  2. Acrocentric

  3. Polycentric

  4. Acentric
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DNA is the way genetic information is stored within cells and allows the transmission of information from one generation to the next. There are four main types of chromosomes: metacentric, submetacentric, acrocentric, telocentric. Metacentric chromosomes are X-shaped, with the centromere in the middle so that the two arms of the chromosomes are almost equal. A chromosome is a metacentric if its two arms are equal or almost equal in length.
So, the correct answer is 'Metacentric'.
Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

Metachromosome with medial centromere and equal arms is

  1. Telocentric

  2. Acrocentric

  3. Metacentric

  4. Submetacentric
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. A telocentric chromosome is a chromosome in which the centromere is located at the terminal end of the chromosome and their shape is similar to the letter i.
B. An acrocentric chromosome is a  chromosome in which the centromere is located near to one end of the chromosome. 
C. Metacentric chromosomes are X-shaped chromosomes and the centromere are present in the centre (medial) so that the two arms are equal.
D. A submetacentric chromosome is a chromosome in which the centromere is located near the slightly away from the centre and the two arms are slightly unequal in length and form L-shape. 
So, the correct answer is 'Metacentric'.
Multiple choice botany cell structure and organization membrane bound organelles cell: size and differentiation microscopy

Colour of rose petals is due to water soluble pigment present in

  1. Cytoplasm

  2. Intercellular spaces

  3. Nucleus

  4. Vacuoles
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Colour of rose petals is due to water-soluble pigment present in the vacuoles.
  • The plant vacuoles consist of various water-soluble pigments such as carotenoids, anthocyanins and xanthophylls etc.
  • Anthocyanins are also water-soluble pigments which are red, purple, or blue in colour depending on the pH (blueberry, raspberry etc).
  • The colour of flower petals (red, pink, blue and purple) is mainly from the pigments called anthocyanins.
  • So, the correct answer is 'Vacuoles'.
Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

A chromosome, in which the centromere is situated close to its end so that one arm is very short and other very long is

  1. Acrocentric

  2. Metacentric

  3. Sub-metacentric

  4. Telocentric
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Every chromosome has a primary constriction of the centromere on the sides of which disc-shaped structures called kinetochores are present.
Based on the position of the centromere, the chromosomes can be classified into four types.
The metacentric chromosome has a middle centromere forming two equal arms of the chromosome.
The sub-metacentric chromosome has centromere slightly away from the middle of the chromosome resulting into one shorter arm and one longer arm.
In the case of acrocentric chromosome the centromere is situated close to its end forming one extremely short and one very long arm.
Telocentric chromosome has a terminal centromere.
So, the correct option is 'Acrocentric'.
Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

A chromosome carrying centromere at one end is

  1. Acrocentric

  2. Telocentric

  3. Metacentric

  4. Submetacentric
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
    A. An acrocentric chromosome is a  chromosome in which the centromere is located near to one end of the chromosome. 
    B. A telocentric chromosome is a chromosome in which the centromere is located at the terminal end of the chromosome and their shape is similar to the letter i.
    C. Metacentric chromosomes are X-shaped chromosomes and the centromere are present in the centre so that the two arms are equal.

      D.  A submetacentric chromosome is a chromosome in which the centromere is located near the slightly away from the centre and the two arms are slightly unequal in length and form L-shape. 

      So, the correct answer is 'Telocentric'.

      Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

      Shape of chromosomes is determined by position of

      1. Centrosome

      2. Centromere

      3. Telomere

      4. Micromere
      Reveal answer Fill a bubble to check yourself
      B Correct answer
      Explanation
      • The shape of chromosomes is determined by the position of centromeres.
      • 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.
      • It is a specialized DNA sequence that links a pair of sister chromatids where the spindle fibres are attached during cell division.
      • So, the correct answer is 'Centromere'.
      Multiple choice botany cell structure and organization membrane bound organelles cell: size and differentiation microscopy

      Cell sap occurs in organelle

      1. Nucleolus

      2. Vacuole

      3. Endoplasmic reticulum

      4. Golgi bodies
      Reveal answer Fill a bubble to check yourself
      B Correct answer
      Explanation
      • Cell sap (fluid inside the vacuole of a plant cell which serves as storage of materials) occurs in the vacuole.
      • A vacuole is a membrane-bound (tonoplast) organelle present in cells.
      • It forms an enclosed compartment within the cell which are filled with water, dissolved inorganic and organic molecules (enzymes)
      • It stores food and variety of nutrients required by the cell to survive and also store waste products which protect the cell from getting contaminated.
      • So, the correct answer is 'Vacuole'.
      Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

      The chromosome which lacks a centromere is

      1. Acentric

      2. Acrocentric

      3. Metacentric

      4. Telocentric
      Reveal answer Fill a bubble to check yourself
      A Correct answer
      Explanation

      A. Acentric chromosome lacks a centromere as the centromere is the point of attachment for the spindle fibres.

      B. An acrocentric chromosome is a  chromosome in which the centromere is located near to one end of the chromosome. 
      C. Metacentric chromosomes are X-shaped chromosomes and the centromere are present in the centre so that the two arms are equal.
      D. A telocentric chromosome is a chromosome in which the centromere is located at the terminal end of the chromosome and their shape is similar to the letter i or is rod-shaped.
      So, the correct answer is 'Acentric'.

      Multiple choice botany nucleus and chromosome membrane bound organelles cell: size and differentiation microscopy

      Shape of metacentric chromosome in anaphase is

      1. L-shaped

      2. V-shaped

      3. J-shaped

      4. I-shaped.
      Reveal answer Fill a bubble to check yourself
      B Correct answer
      Explanation
      • Metacentric chromosomes are X-shaped chromosomes and the centromere are present in the centre so that the two arms are equal.
      • During anaphase, these chromosomes appear V-shaped as the chromosomes split and the daughter chromatids move to the opposite poles of the cell.
      • So, the correct answer is 'V-shaped'.