Fill in the blanks A, B, C and D with the correct choice of words.
Viruses are (A), protected by a protein coat called (B). The protein coat is made up of the assembly of small units called the (C ). It protects the internal (D)of the viruses.

Options

A. A-glycolipids, B - capsule, C- chains, D - sugars
B. A- lipoproteins, B- covers, C- helices, D-genetic material
C. A-glycoproteins, B - cell wall, C - fatty acids, D - cytoplasm
D. A- nucleoproteins, B - capsid, C- capsomeres, D- genetic material.

Answer

To fill in the blanks A, B, C, and D in the statement about viruses, we can follow these steps:

1. **Identify what viruses are**: The first blank (A) needs a term that describes what viruses fundamentally are. Viruses are known to be composed of nucleic acids (DNA or RNA) and proteins. Therefore, the correct term to fill in blank A is "nucleoproteins."

2. **Determine the name of the protein coat**: The second blank (B) refers to the protective protein coat surrounding the virus. This coat is known as the "capsid." Hence, we fill in blank B with "capsid."

3. **Identify the building blocks of the protein coat**: The third blank (C) requires a term that describes the small units that make up the protein coat (capsid). These small units are called "capsomers." Thus, we fill in blank C with "capsomers."

4. **Identify what the coat protects**: The last blank (D) pertains to what the capsid protects within the virus. The capsid protects the virus's genetic material, which can be either DNA or RNA. Therefore, we fill in blank D with "genetic material."

Putting it all together, we have:
- A: nucleoproteins
- B: capsid
- C: capsomers
- D: genetic material

Final filled statement:
"Viruses are (A) nucleoproteins, protected by a protein coat called (B) capsid. The protein coat is made up of the assembly of small units called (C) capsomers. It protects the internal (D) genetic material of the viruses."