Welcome to your Eduqas Core Quizz 2 The nitrogeneous bases which differ between RNA and DNA are U & T A & G U & G A & C The semi-conservative approach implies the DNA is copied Accurately inaccurately in halves in parts Select the incorrect statement regarding the haemoglobin molecule. A complete haemoglobin molecule, with four haem groups, can carry three oxygen molecules at a time. Each haem group contains an iron atom. The haem group is responsible for the colour of haemoglobin. One oxygen molecule,O2, can bind with each iron atom. Cellular activities are controlled by nucleus through transcription of DNA transcription of RNA translation of DNA transcription of proteins What are linked together by hydrogen bonds to form cellulose microfibrils cellulose chains fat chains glycogen chains starch chains Amylose and amylopectin are polysaccharides of alpha glucose beta glucose gamma glucose delta glucose Cellulose is a polymer of beta glucose beta fructose alpha glucose beta fructose Which ion is required for production of chlorophyll magnesium calcium potassium iron The first step of translation for production of polypeptides is Coming together of mRNA, Ribosome & tRNA Pairing of tRNA with mRNA Production of amino acid chain Attachment of ribosome to mRNA Select the incorrect statement with regard to ATP. It is formed from a molecule of ribose, 2 molecules of adenine and three phosphate groups. ATP is adenosine triphosphate It is a nucleotide derivative. ATP is a complex organic chemical. Secretory vescicles from the golgi body carry the enzyes to the cell surface and release their contents. This is an example of Exocytosis Phagocytosis Pinocytosis Osmosis Which of the following is responsible for the 'mosaic' nature of the cell surface membrane? Proteins Phospholipids Cholesterol Carbohydrates The site of protein synthesis. Ribosomes Golgi complex Lysosome Mitochondria Which of the following organelles is the largest and the most easily observed with the light microscope? Nucleus Mitochondria Ribosomes Lysosomes The organelle responsible for generating reproductive hormones such as oestrogen and testosterone Smooth ER Rough ER Ribosome Cytoplasm Select the correct statement about mitochondria. Liver and muscle cells contain large numbers of mitochondria. Mitochondria are single membrane bound organelles. The outer membrane contains a transport protein called cristae. The number of mitochondria in a cell is not variable. Which of the following organelles would display a trilaminar appearance at very high magnifications? Cell surface membrane Mitochondria Cilia Golgi complex What is the function of enzymes present in the golgi body of plants? Conversion of sugars into cell wall components. Conversion of amino acids into cell wall components. Breaks triglycerides into individual fatty acids and glycerol. Facilitates the movement of ions and large molecules across the cell surface membrane. Select the incorrect statement from the following. Vacuoles are confined to plant cells only. Cell walls are relatively thick and physically strong. Plant cells are often larger than animal cells. All cells have a cell surface membrane. In active transport, the exchange takes place between 3 Na+ ions and 2 K+ ions 2 Ca2+ ions and 3 Na+ ions 3 K+ ions and 2 Ca2+ ions 1 Ca2+ ion and 3 Na+ ions Global warming leads to imbalance in enzyme activity because Enzymes get denatured at high temperatures Enzymes work only at low CO2 concentration Enzymes work at 25 °C Substrates melt at high temperatures Time is Up!