Question

Which of the following is true of nanometer a a nanometer is about the size of a common bacterial cell b cells come in a wide variety of sizes and shapes b the nanometer is the most common measurement used in measuring the whole cel, c a nanometer is equivalent to 10 A d a nanometer is one millionth of a meter e none of the above

Answer 1

Nanometer = it is denoted by nm. It is equal to 10^-9 or 1nm = 10^-9.

It is 1-billionth of a metre or 1-millionth of a millimetre.

It is commonly used to measure the sub-cellular Structures or organisms like Ribosomes and viruses respectively.

It is not commonly used to measure the whole cell. For it generally micrometres or microns = 10^-6 is preferred.

The size of a common bacterial cell is 1/1000 nanometers or bacteria is generally measured in micrometres.

1 nanometre = 10 A or Angstroms. As 1A = 10^-10. 10^-9 nm = 10 * 10^-10 A = 10^-9.

So, accordingly Option D, a nanometre is equal to 10A is correct answer for the question.

Option a is wrong as bacteria are commonly of size of microns.

Option b is wrong as micrometres or microns is commonly used unit for measuring whole cell.

Option d is wrong as a nanometre is equal to one billionth of a metre Instead of one millionth.

Option e is wrong as Option D is correct answer of question.