2018 Eukaryotic Cell Structure & Cell Membrane MCQ QP+MS

2018 Eukaryotic Cell Structure and Cell Membranes MCQ2018 / H2 / ACJC PRELIM / P1 Q11The electron micrographs show two different types of cells (not shown to scale). 1234Cell A 576Cell BWhich row matches the structures to their correct function?Structure in cell AStructure in cell BFunctionA37Provide energy for the cellsB15Maintain the shape of the cells C26Photosynthesise

D46Secrete proteins2018 / H2 / ACJC PRELIM / P1 Q22The plasma membrane is the cell’s protective barrier as it prevents foreign molecules from entering the cell. However, in drug research experiments, foreign molecules such as drugs or short DNA fragments need to be transported into the cell. Electroporation is a technique used to increase the permeability of the membrane transiently by treating the cell with short electrical pulses.Which statement most likely explains how electroporation works?AThe short electrical pulses denature the membrane proteins, allowing foreign molecules to pass through.BThe short electrical pulses cause the foreign molecules to be attracted to the surface of the membrane.CElectricity increases the hydrophobic nature of foreign molecules, allowing them to pass through the hydrophobic core of the phospholipid bilayer. DElectroporation causes the phospholipids to move apart to create pores for foreign molecules to pass through.2018 / H2 / ACJC PRELIM / P1 Q13Which row matches the descriptions of biological molecules to where they are found? 1Polymer of glucose molecules linked by β-1,4 glycosidic bonds to form a straight chain2An unbranched and helical polymer of glucose molecules linked by α-1,4 glycosidic bonds3 An amphipathic, phosphate-containing molecule123ACell wall of eukaryotes onlyStorage granules in animal cellsPlasma membrane of prokaryotes and eukaryotesBCell wall of prokaryotes and eukaryotesStorage granules in plant cellsPlasma membrane of eukaryotes onlyCCell wall of prokaryotes and eukaryotesStorage granules in animal cellsPlasma membrane of prokaryotes onlyDCell wall of eukaryotes onlyStorage granules in plant cellsPlasma membrane of prokaryotes and eukaryotes

2018 / H2 / AJC PRELIM / P1 Q14The electron micrograph shows cells from an aquatic plant. Which of the following about structures 1 to 4 is correct?contains DNAcontains rRNAcontains tRNAcontains proteinsA1, 222, 3, 41, 4B1, 3, 42, 32, 43, 4C2, 32, 3, 43, 41, 2, 3, 4D23, 41, 31, 2

2018 / H2 / ACJC PRELIM / P1 Q45The diagram shows the cell surface membrane of an actively respiring liver cell placed in a solution of glucose with a lower water potential than that of the liver cells. Arrows P, Q, R and S show the movement of various particles across the cell surface membrane. Which arrows correctly reflect the movements of oxygen, carbon dioxide, glucose and water across the surface membrane of this cell?OxygenCarbon dioxideGlucoseWaterAPQRSBQSRSCQSPPDRSPR2018 / H2 / DHS PRELIM / P1 Q16An electron micrograph of a cell is shown below.

Match the organelles E, F, G, H and J associated with the cellular processes listed.EFGHJADNA replicationDigestion of materialOrganizes the spindleOxidative phosphorylationPackaging of secretory productsBOxidative phosphorylationOrganizes the spindleDigestion of materialDNA replicationPackaging of secretory productsCOrganizes the spindleDigestion of materialOxidative phosphorylationPackaging of secretory productsDNA replicationDDNA replicationOrganizes the spindlePackaging of secretory productsOxidative phosphorylationDigestion of material

2018 / H2 / DHS PRELIM / P1 Q27Which organelle(s) is / are required for the formation of the hydrolytic enzymes found in lysosomes? 2018 / H2 / EJC PRELIM / P1 Q48 Which of the following curves best represent the movement of substances by simple diffusion and facilitated diffusion? simple diffusionfacilitated diffusionAdbBdcCca

Dcd2018 / H2 / IJC PRELIM / P1 Q19Sometimes scientists need to isolate organelles. This can be achieved by taking a number of cells and breaking their cell surface membranes to release the contents of the cells into a buffer solution.In zonal centrifugation the suspension of cell contents is placed on top of a sucrose density gradient. The tube is then placed in a centrifuge and spun at high speed. The larger and denser particles will move towards the bottom of the tube faster than smaller and less dense particles as shown below. If a sample of intact prokaryotes had been added to a suspension of eukaryotic cell contents, where would you expect them to be found?2018 / H2 / IJC PRELIM / P1 Q610The diagram represents stages in glucose uptake through a cell surface membrane.

Which process is shown? Aactive transportBfacilitated diffusionCosmosisDsimple diffusion2018 / H2 / MJC PRELIM / P1 Q1QUESTION 11The diagram shows an electron micrograph of a cell. Which row correctly describes structures P – R?

PQRAsynthesis of ribosomessubstrate level phosphorylationactive replication of genesBprovision of large surface area for attachment of ribosomesformation of ATP from light energyactive transcription of genesCsynthesis of membrane proteinsoxidative decarboxylationactive transcription of genesDtransport of proteins to Golgi apparatusmodification of mRNA transcriptsactive replication of genes2018 / H2 / MJC PRELIM / P1 Q2QUESTION 12 A ribosome consists of a large and a small subunit, each subunit containing ribosomal RNA (rRNA) complexed with proteins. Which sequence of events concerning ribosomes is correct? AWithin the nucleolus, rRNA and proteins are synthesised and subunits are formed. They become membrane bound as they are exported through the nuclear envelope to the cytoplasm and rough endoplasmic reticulum (rER). BrRNA and proteins are synthesised in the Golgi body and are transported to the nucleolus for subunit formation. CrRNA is synthesised in the nucleolus and proteins are synthesised by the rough endoplasmic reticulum (rER). Subunit formation occurs within the cytoplasm for free ribosomes and on the surface of the rER for attached ribosomes. DrRNA synthesised within the nucleolus is complexed with proteins that have been imported from the cytoplasm. The subunits formed are exported to the cytoplasm via the nuclear pores. 2018 / H2 / MJC PRELIM / P1 Q3QUESTION 13The following are all observations about cell surface membranes. 1Phospholipids labelled with radioactive phosphate groups change position over time. 2Proteins labelled with fluorescent dyes change position over time. 3Lectins are proteins that bind to polysaccharides. They only attach to the outside of membrane samples. 4Electron microscope images of membranes fractured by freezing show a large number of regularly arranged particles interrupted by larger particles.5Some membranes contain more cholesterol and unsaturated fatty acid chains than other membranes.

6Some proteins can only be separated from the membrane by disrupting the membrane with detergent. Which observations provide evidence for the fluid mosaic model of cell surface membranes?A 1, 2 and 4B 1, 2 and 6C 3, 4 and 5D 3, 5 and 62018 / H2 / NJC PRELIM / P1 Q114Most wild plants contain toxins that deter animals from eating them. A scientist discovered that a toxin produced by a certain plant was also toxic to the same plant if it were applied to the roots of the plant. To find out why the plant was not normally killed by its own toxin, he fractionated some plant cells and found that the toxin was in the fraction that contained the largest cell organelle. He also found that the toxin was no longer toxic after it was heated. Which statements are consistent with the scientist’s observations?1The toxin is stored in the central vacuole.2The toxin cannot cross the membrane of the organelle in which it is stored.3The toxin is stored in chloroplast.4The toxin is likely to be lipid-soluble.5The toxin may be an enzyme.A1, 2 and 5B1, 4 and 5C2, 3 and 4D3, 4 and 52018 / H2 / NJC PRELIM / P1 Q315A certain cell surface membrane is made entirely of phospholipids and