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What is the function of DNA polymerase?
The role of B and T lymphocytes?
Which bonds are involved in primary, secondary, tertiary and quarternary structures?
The effects of Tobacco and Nicotine on health?
What is the function of squamous epithelium?
Thanks.
DNA polymerase : catalyses the polymerization of deoxyribonucleotides into a DNA strand. It adds free nucleotides to elongate the DNA strand being formed during replication. However, it cannot initiate the formation of the stand, you need a primer for that. The polymerase enzyme can only continue to add nucleotide by complimentary base pairing to the pre-existing 3'-OH group.
Bonds present. Primary: peptide bonds.
Secondary: Hydrogen bonds.
Tertiary: ionic bonds (between the acidic and basic groups), disulphide bonds (between cysteines), hydrophobic interactions (non-polar groups), hydrogen bonds (if side groups contains hydroxyl or amine groups)
Quaternary structure: Same as the bonds involved in the tertiary structure, depending on the side chains of the polypeptides involved.
Tobacco effects: heart attacks, strokes, chronic obstructive pulmonary diseases (COPD), hypertension, cancer.
Nicotine: High blood pressure, high heart rate, addiction, high breathing rate, hyperglycemia, weight loss, increased 'stickiness' of blood platelates.
Function of squamous epithelium: Aids passage of materials by diffusion by forming a smooth, moist interior (in the alveoli of lungs); protection of underlying tissues (in the skin, mouth, esophagus etc.)