Cell Structure All subtopics
A student prepares a temporary slide of onion epidermis. Which stain should be used to make the nuclei clearly visible?
Why is the coverslip lowered slowly at an angle using a mounted needle when preparing a temporary slide?
A photomicrograph shows a cell measuring 60 mm in length. The actual cell is 30 µm long. What is the magnification?
A structure measures 0.25 mm on a micrograph at a magnification of ×500. What is the actual size of the structure?
Which feature of a biological cell drawing would lose marks in an examination?
What is the key difference between a plan diagram and a cell drawing?
During calibration, a student finds that 40 eyepiece divisions align with 25 stage micrometer divisions, each of 10 µm. What is the real length of one eyepiece division at this magnification?
Why must the eyepiece graticule be recalibrated whenever the objective lens is changed?
Which statement correctly distinguishes resolution from magnification?
A scientist studying the internal ultrastructure of a mitochondrion at the highest possible resolution should select which type of microscope?
A student observes a specimen with a light microscope at ×1500 and tries to increase magnification to ×3000 using a stronger eyepiece. The image becomes larger but no new detail appears. What term describes this?
Why do electron microscopes achieve higher resolution than light microscopes?
A virus has a diameter of 80 nm. Expressed in micrometres, what is this measurement?
A researcher wants a 3D image of the surface of a pollen grain. Which microscope is most appropriate, and why?
Which measurement unit is most appropriate for reporting the diameter of a ribosome viewed by electron microscopy?
Which structural feature is found in mitochondria and chloroplasts but NOT in the nucleus of a eukaryotic cell?
A cell biologist examines a cell under an electron microscope and observes extensive flattened membrane sacs studded with small dark dots, located near a structure with a double membrane and pores. Which organelle is being observed?
Which statement correctly describes the function of the nucleolus?
A scientist isolates an organelle that has a double membrane, contains 70S ribosomes, circular DNA and stacks of internal membranes called grana. The organelle is most likely a:
Which feature is present in a typical plant cell but absent in a typical animal cell?