Question

The plasma membrane does of all these expect
A. Contain the hereditary material
B. Act as a boundary or border for the cytoplasm
C. Regulates passage of material in and out of the cell
D. None of the above

Answer 1

Hint: Hereditary material is contained only by the nucleus of the cell in the human body. Plasma membranes contain proteins as an important component. It also contains highly specialized lipids.

Complete step-by-step answer:
1. The plasma membrane is the outermost layer of the cell and therefore it does not have any hereditary material present within it.
2. This layer is prone to external stress where any material would have been impaired.
Therefore hereditary material is present in the nucleus of the cell.
3. Plasma membrane which protects the cell from external stress also has other functions such as selective permeability, endocytosis, and exocytosis.
4. The major elements of the plasma membrane are lipids, proteins, and carbohydrates that are attached to the lipids and proteins.
5. A phospholipid is a lipid made of glycerol, two fatty acid tails, and phosphate.
6. The hereditary material which is present in the nucleus is actually the DNA.
7. DNA is a shortened word for Deoxyribonucleic acid consists of two polynucleotide chains that wrap around each other to form a double helix
8. DNA carries genetic instructions for the development, functioning, growth, and reproduction of all living creatures. The nucleotides are covalently bound to each other.
9. A, T, C, and G are connected through hydrogen bonds to each other such as A to T and G to C and thus form a double-stranded DNA.
So, the correct answer is “Option A Contain the hereditary material ”.

Note: The plasma membrane does not contain hereditary material because it is the outermost layer in the animal cell which is prone to external stress where any hereditary material would have been damaged. So, the hereditary material is present in the nucleus.