Question

A cell lacking in the nucleus, also lacks.
(a) Plasma membrane
(b) Mitochondria
(c) Chromosome
(d) Vacuole

Answer 1

Hint: Nucleus contains all the genetic information in our body stored in a coded form in a specialized structure that was first discovered by Hofmeister. The name of this genetic information storing unit inside the nucleus was given by Waldeyer. Forty-six pairs of this structure are present in human somatic cells.

Complete answer:
The Chromosome is the physical basis of inheritance and it is present inside the nucleus of every eukaryotic cell. So if a cell lacks a nucleus it will also lack a chromosome. The chromosomes are present in an uncoiled form inside the nucleus which is known as chromatin and can not be distinguished separately in normal conditions. During cell division, these chromatins condense and form chromosomes and therefore as clearly visible at certain stages of the cell cycle (metaphase).

Additional Information:
Types of chromosome based on the position of the centromere are:
Metacentric chromosome: The centromere is present at the center of the chromosome.
Sub-Metacentric: Centromere is located between the center and one end of the chromosome.
Acrocentric: The centromere is located in the subterminal.
Telocentric: Centromere is located at the terminal ends of the chromosome.
The following parts are seen in a eukaryotic chromosome:
-Pellicle
-Matrix
-Chromonema
-Centromere or Primary constriction
-Secondary Constriction or NOR (capable of nucleolus formation)
-Satellite
-Telomeres

So, the correct answer is ‘chromosome’.

Note:
DNA and histone proteins constitute a major portion of the chromosomes. The composition can be given as follows:
DNA-40%
Histone Proteins-50%
Non-Histone Proteins-8.5-9%
RNA-1.5%
Trace amounts of calcium, iron, and magnesium ions are also found.
It should be remembered that in humans all types of chromosomes including metacentric, submetacentric, and acrocentric chromosomes are found but telocentric chromosomes are absent in humans. Therefore during the anaphasic movement, the I shaped chromosome is not seen.