Molecular Biology and Genetics

RNA contains ribose sugar, not deoxyribose. Deoxyribose is the sugar found in DNA.

DNA provides the genetic instructions for synthesizing proteins. The process involves transcription into RNA and translation into amino acid sequences.

The two strands of the DNA double helix are held together by hydrogen bonds between the complementary nitrogenous bases (A-T and G-C).

DNA polymerase adds nucleotides to the growing strand by forming phosphodiester bonds between the 3'-OH of the existing strand and the 5'-phosphate of the incoming nucleotide. It does not form the hydrogen bonds between base pairs; those form spontaneously based on complementarity.

According to Chargaff's rules, A=T and G=C. If Thymine is 20%, then Adenine is also 20%. The remaining 60% must be split equally between Guanine and Cytosine, so Guanine is 30%.

Adenine and Guanine are the two purine bases found in DNA.

DNA is a polymer made of repeating units called nucleotides, which consist of a sugar, a phosphate, and a nitrogenous base.

Chromosomes are long, threadlike structures composed of DNA and proteins that carry genetic information. They are located within the nucleus of eukaryotic cells.

DNA is an acronym for Deoxyribonucleic Acid, which is the molecule that carries the genetic instructions for life.

RNA is generally less stable than DNA and lacks the extensive proofreading mechanisms that DNA replication possesses, leading to higher mutation rates and faster potential evolution.

RNA is more susceptible to mutation because it is single-stranded and lacks the robust error-correction machinery that double-stranded DNA uses during replication.

In the structure of DNA, the nitrogenous base cytosine (C) always forms a hydrogen bond with guanine (G) according to Chargaff's rules.

The double helix is the term used to describe the physical structure of the DNA molecule, which consists of two strands that wind around each other.

The double helix is the term used to describe the twisted ladder or spiral staircase structure of the DNA molecule. The other options refer to genetic components or structures, not the shape of the molecule.

Chromosomes are threadlike structures made of DNA and proteins that are found in the nucleus of cells. DNA is coiled tightly around proteins to form these structures.