Question

Animal cell lacking nuclei would also lack in
A. Chromosome
B. Ribosome
C. Lysosome
D. Endoplasmic Reticulum

Answer 1

Hint: The nucleus is a membrane organelle found in eukaryotic cells. It stores the majority of the cell's genetic material.

Complete answer:
Animal cells lacking nuclei would also lack in ‘Chromosome'.
- The nucleus of a non-dividing cell contains chromatin which is uncoiled thread-like material of chromosome.
- Chromatin contains a DNA molecule and an almost equal amount of basic histone proteins. Histone proteins are present in octamer form.
- Chromosomes occur during the cell division in the metaphase period and they are formed due to coiling and folding of chromatin. If any animal cell lacks a nucleus then it will lack chromosomes too.

Additional Information:
- The ribosome is a complex molecule made of ribosomal RNA molecules and proteins that form a factory for protein synthesis in cells. It was discovered by George E. Palade in 1955.
- A lysosome is a membrane-bound cell organelle that contains lysozyme as digestive enzymes. Lysosomes are responsible for the removal of cellular debris as well as dead and infected cells. They may also be used to destroy invading viruses and bacteria.
- Endoplasmic Reticulum is a wide network of membranous tubules within the cytoplasm of a eukaryotic cell. It lies in close proximity to the nuclear membrane. It can be of two types-
a. RER (Rough Endoplasmic Reticulum)- It has ribosomes attached to it and is involved in protein synthesis.
b. SER (Smooth Endoplasmic Reticulum)- It is involved in lipid synthesis.

So, the correct answer is ‘Chromosome’.

Note: Chromosomal DNA is packaged inside microscopic nuclei with the help of histones. These are positively-charged proteins that strongly adhere to negatively-charged DNA and form complexes called nucleosomes. Each nucleosome is composed of DNA wound 1.65 times around eight histone proteins.