Btec Applied Science Unit One Biology – Complete Questions and Answers 2023

Btec Applied Science Unit One Biology – Complete Questions and Answers 2023. What is the function of the Golgi apparatus? correct answerModified and packaged proteins into vesicles for transport What is the function of the lysosomes? correct answerDigests old cell material and waste What is the function of the centrioles? correct answerForm into spindle fibres for cell division What is the function of the chloroplasts? correct answerphotosynthesis What is the function of the tonoplasts? correct answerThe membrane around the vacuole to keep it together What is the function of the vacuole? correct answerMaintain turgid pressure in the plant cell What is the function of the plasmodestmata? correct answerTo allow materials to pass through the cell wall What is the function of the amyloplasts? correct answerStarch synthesis and storage Name three organelles which are only in plant cells correct answerVacuole, chloroplasts, cell wall Define eukaryotic cells correct answerAre part of a multicellular organisms Define prokaryotic cells correct answerAre unicellular organisms Name two differences between eukaryotic and prokaryotic cells? correct answerEukaryotic has a nucleus but prokaryotic doesn't my eukaryotic has a membrane bound organelles while prokaryotic doesn't What two dyes are used to show gram positive and gram negative bacteria? correct answerCrystal violet and safranin Describe the difference between gram positive and gram negative? correct answerGram negative has thin cell walls so the ethanol washes out the crystal violet, so they appear safranin pink. Gram positive appears purple Describe the key features of a sperm cell? correct answerAcross one to penetrate the egg, tail for swimming, lots of mitochondria for energy Describe the features of egg cells? correct answerHormones to attract the speed, zona pellucuda to protect the egg, corona radiate to supply protein to developing foetus What is TEM? correct answerTransmission electron microscope What is SEM? correct answerScanning electron microscope Compare TEM and SEM correct answerTEM produces images of thin slices of material whereas SEM looks at the surface topography. Both are very magnified compared to the light microscopes and require dead samples. Describe how a light microscope works correct answerLight microscopes use visible light and magnifying lenses to observe small objects Describe how an electron microscope works correct answerThey use a beam of electrons in a vacuum with a wavelength of less than 1 nm to visualise the specimen Give one positive and one limitation of light microscopes correct answerPositive - can observe living structures Negative - relatively low magnification (x500) and resolution (x200nm) Give one positive and one negative of electron microscopes correct answerPositive - high magnification (x) and resolution (0.1nm) Negative - destroys the sample Magnification equation correct answermagnification = image size/actual size Describe the key features of a palisade cell correct answerFound in leaves, they are rectangular box shaped cells that contain chloroplasts. The chloroplasts can absorb light for photosynthesis. Chloroplasts move around in the cytoplasm to maximise the amount of light absorbed Describe the key features of a root hair cell correct answerFound in a plants roots near the growing tip. They have long hair like extensions called root hairs. They increase the surface area of the cell to maximise the movement of water and minerals. Describe the key features of a red blood cell (erythrocytes) correct answerBiconcave in shape increases the surface area to volume ratio. They are flexible so that they can squeeze through the narrow capillaries. They have no nucleus, this increases space for haemoglobin to carry oxygen Describe the key features of white blood cells (neutrophils) correct answerMulti-over nuclei which help them to squeeze through small gaps when travelling to the site of infection. Cytoplasms holds lysosomes that contain enzymes which breakdown pathogens and then ingest them