Btec Applied Science Unit One Biology questions with correct answers 2023

Btec Applied Science Unit One Biology questions with correct answers 2023What is the function of the mitochondria? cellular respiration What is the function of the ribosomes? protein synthesis What is the function of the smooth endoplasmic reticulum? Synthesis and transport of lipids and carbohydrates What is the function of the Golgi apparatus? Modified and packaged proteins into vesicles for transport What is the function of the lysosomes? Digests old cell material and waste What is the function of the centrioles? Form into spindle fibres for cell division What is the function of the chloroplasts? photosynthesis What is the function of the tonoplasts? The membrane around the vacuole to keep it together What is the function of the vacuole? Maintain turgid pressure in the plant cell What is the function of the plasmodestmata? To allow materials to pass through the cell wall What is the function of the amyloplasts? Starch synthesis and storage Name three organelles which are only in plant cells Vacuole, chloroplasts, cell wall Define eukaryotic cells Are part of a multicellular organisms Define prokaryotic cells Are unicellular organisms Name two differences between eukaryotic and prokaryotic cells? Eukaryotic 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? Crystal violet and safranin Describe the difference between gram positive and gram negative? Gram 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? Across one to penetrate the egg, tail for swimming, lots of mitochondria for energy Describe the features of egg cells? Hormones to attract the speed, zona pellucuda to protect the egg, corona radiate to supply protein to developing foetus What is TEM? Transmission electron microscope What is SEM? Scanning electron microscope Compare TEM and SEM TEM 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 Light microscopes use visible light and magnifying lenses to observe small objects Describe how an electron microscope works They use a beam of electrons in a vacuum with a wavelength of less than 1 nm to visualise the specimen