16 Questions
What is the term for the phenomenon where each type of nucleobase on one strand bonds with just one type of nucleobase on the other strand?
Complementary base pairing
What is the purpose of the formula C1V1 = C2V2?
To calculate the concentration of a diluted reagent
What is the value of V1 in the equation C1V1 = C2V2, if we want to prepare 10 mL of 15% concentration of fructose from a stock solution of 50% concentration?
3 mL
What is the formula used to dilute a molar solution?
M1V1 = M2V2
What is the molecular weight (M.wt) of NaOH?
40
How many moles of NaOH are present in 400 mL of a 3M solution?
48 moles
What is the purpose of the formula Molarity = Wt / (MW * V)?
To calculate the molarity of a solution
What type of bonds hold the two strands of DNA together?
Hydrogen bonds
What is the main function of DNA in living organisms?
To carry genetic instructions
What is the sugar molecule found in RNA?
Ribose
What is the term for the combination of a base and sugar in a nucleotide?
Nucleoside
What type of bond connects nucleotides in DNA and RNA?
Phosphodiester bond
What is the term for two nucleotides connected to each other?
Dinucleotide
What is the pyrimidine base found in RNA but not in DNA?
Uracil (U)
What are the two types of nucleotide bases?
Purine and pyrimidine
What is the term for a long chain of nucleotides?
Polynucleotide
Study Notes
DNA Structure
- DNA is a molecule that carries genetic instructions used in development, functioning, and reproduction of living organisms and some viruses.
- DNA and RNA are polymeric molecules made up of linear chains of nucleotides.
- Each nucleotide has three parts: a nitrogenous base, a five-carbon-atom sugar, and a phosphate group.
- The combination of base and sugar is called a nucleoside, while the base-sugar-phosphate is called a nucleotide.
- DNA nucleotides are called deoxyribonucleotides (containing 2-deoxyribose sugar), while RNA nucleotides are called ribonucleotides (containing ribose sugar).
- Nucleotide bases can be either a double-ringed purine (adenine (A) and guanine (G)) or a single-ringed pyrimidine (cytosine (C) and thymine (T) in DNA, or uracil (U) in RNA).
- Individual nucleotides are connected through sugar-phosphate bonds, forming a polynucleotide.
- In a DNA double helix, each type of nucleobase on one strand bonds with just one type of nucleobase on the other strand through complementary base pairing.
- Purines form hydrogen bonds with pyrimidines, with adenine bonding only to thymine in two hydrogen bonds, and cytosine bonding only to guanine in three hydrogen bonds.
Buffer Preparation
- Concentration of a diluted reagent can be calculated using the formula C1V1 = C2V2.
- Example: preparing 10 mL of 15% fructose solution from a stock solution with 50% concentration requires 3 mL of stock solution and 7 mL of distilled water.
- Diluting molar solutions can be calculated using the formula M1V1 = M2V2.
- Example: preparing 250 mL of 2M TES buffer from a 5M stock solution requires 100 mL of stock solution.
- Molarity can be calculated using the formula Molarity = (Wt / M.wt) × (1000 / V).
- Example: preparing 3M of NaOH in 400mL requires 48 g of NaOH, with a molecular weight of 40.
This quiz covers the structure of DNA, its role in carrying genetic instructions, and its relation to RNA. It also touches on biochemical techniques used in the study of DNA.
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