1) What are the phases in a typical cell cycle? a) Cell growth, cell division b) Mitosis, meiosis c) Cell growth, mitosis 2) In which organs do cells divide by meiosis? a) Body cells b) Muscle cells c) Ovaries and testes 3) How many chromosomes does a zygote have? a) 23 b) 46 c) 54 4) Where inside the cell are proteins made? a) Nucleus b) Membrane c) Cytoplasm 5) How many different bases are there in DNA? a) 3 b) 4 c) 5 d) 6 6) How is the order of amino acids controlled? a) It is random b) By the order of the bases in DNA c) By the order of proteins 7) Division by mitosis creates 2 cells with have how many chromosomes each. a) Twice as manyas the parent cell. b) The same number as the parent cell. c) Half as many as the parent cell. 8) When do stem cells start to become specialised in humans? a) 2 cell stage b) 4 cell stage c) 8 cell stage d) 10 cell stage 9) What does phototropism mean? a) The growth response of plants to light b) The use of light to make energy in plants. c) Taking photos and making trophies out of them. 10) Which plant hormone is involved in phototropism? a) Adrenaline b) Insulin c) ADH d) Auxin 11) Iron is extracted from iron ore, which contains iron oxide. There are many different types of iron oxide. Which of these formulae has the largest NUMBER of iron atoms in it? a) A b) B c) C 12) Which of these formulae corresponds to the oxide with the highest PROPORTION of iron atoms? a) A b) B c) C 13) The relative atomic masses of iron and oxygen are 56 and 16 respectively. What mass of iron is present inside 72 grams of FeO (Iron Oxide)? a) A b) B c) C d) D 14) Erupting volcanoes give out a mix of gases including sulfur dioxide (SO2) molecules. The atoms in sulfur dioxide molecules are held together by ........ bonds. a) ionic b) covalent c) metallic 15) These bonds are formed when electrons are ................ between atoms. a) shared b) totally transferred 16) The bonds between the atoms in a sulfur dioxide molecule are ................ a) strong b) weak

B5 C5 revision

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