Mole | MCQs

Explanation

Explanation

Genes are the smallest functional units of hereditary material found on chromosomes.

Genes are made up of DNA.

Explanation

The molar mass of water (H₂O) is 18 grams per mole (H = 1g × 2, O = 16g).

So, 1 mole of water weighs 18 grams.

Explanation

Explanation

Centrioles play a crucial role in organizing the spindle fibers during cell division, specifically in mitosis and meiosis.

They help in the formation of the spindle apparatus, ensuring proper chromosome separation.

Explanation

James Watson is an American molecular biologist, geneticist, and zoologist.

In 1953, he co-authored with Francis Crick the academic paper proposing the double helix structure of the DNA molecule. 

ND13-07-2023

Explanation

• Small pieces of DNA are called plasmids.
• Plasmids are circular, double-stranded DNA molecules that are separate from the chromosomal DNA.
• It can replicate independently, commonly found in bacteria.

Explanation

The formula for calculating the density of an ideal gas is d = PM/RT, where: 

• d: is the density of the gas
• P: is the pressure of the gas
• M: is the molar mass of the gas
• R: is the ideal gas constant
• T: is the temperature of the gas in Kelvin

The ideal gas law is expressed as PV = nRT, where 'n' is the number of moles.

Density (d) is mass (m) divided by volume (V), so d = m/V.

We can relate the number of moles (n) to mass (m) and molar mass (M) using n = m/M.

Substituting this into the ideal gas law, we get PV = (m/M)RT.

Rearranging the equation to solve for density (d = m/V), we get d = PM/RT. 

Explanation

• RNA polymerase is the enzyme responsible for transcribing DNA into RNA during the process of transcription.
• It reads the template DNA strand and adds nucleotides to a growing RNA chain.

Explanation

• Structure of DNA was discovered by James Watson and Francis Crick in 1953.
• They discovered the double-helix structure of DNA using X-ray crystallography data.
• Their discovery revealed the double-helix structure of DNA, where two complementary strands are twisted together with sugar and phosphate molecules, and the nitrogenous bases (adenine, thymine, cytosine, and guanine) pair in a specific manner.