Question

Which of the following statements about DNA is false?

a. one chromosome is made up of many DNA molecules.
b. a eukaryotic genome is made up of many DNA molecules.
c. a dna double helix contains both covalent bonds and hydrogen bonds.
d. a strand of dna is made up of many of these are true.

Answer 1

The false statement about DNA is that one chromosome is made up of many DNA molecules; in reality, a single chromosome consists of one long double-stranded DNA molecule. DNA is a double helix with strands held together by hydrogen bonds between adenine, thymine, guanine, and cytosine bases. Therefore correct option is A

Step-by-step explanation:

The false statement about DNA is: one chromosome is made up of many DNA molecules. In truth, one chromosome is typically composed of a single long DNA molecule. The genetic material of eukaryotic organisms, such as humans, is organized into multiple chromosomes, each being a single molecule of double-stranded linear DNA. This DNA is coiled and condensed around proteins into structures known as nucleosomes, further packaging the DNA into a compact, organized form within the cell nucleus.

A DNA molecule is structured as a double helix, featuring two strands that wind around each other. Each strand has a sugar-phosphate backbone, and the strands are held together by hydrogen bonds between the nitrogenous bases - adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). These hydrogen bonds are critical to the stability of the DNA molecule, while the sugar and phosphate groups are connected by covalent bonds.