Organisms are made up of cells. Most organisms are multicellular and have cells that are specialised to do a particular job. Microscopes are needed to study cells in detail.
What is the function of a ribosome?
To release energy from glucose
To build sugars by photosynthesis
A type of white blood cell called a macrophage measures 5 x 10-5 m.
What does it measure in micrometres?
If the actual size of a cell is 100 μm, and 10 cm in a book, what is the magnification of the image in the book?
How have microscopes developed over the years?
Increased magnification, decreased resolution
Increased cost, decreased depth of field
Increased magnification, increased resolution
If a cell called a megakaryocyte measures 1 x 10-4 m, and a neutrophil measures 1 x 10-5 m, what is the difference in order of magnitude?
Which of the following is an advantage of the transmission electron microscope compared with the light microscope?
Higher magnifications are possible with the transmission electron microscope
The transmission electron microscope has a lower resolution
The transmission electron microscope has a greater depth of field
Which of the following is the correct sequence for setting up a microscope on high power?
Focus on low power with the coarse adjustment, move the high power objective in line with the specimen, refocus on high power with the fine adjustment
Focus on low power with the fine adjustment, move the high power objective in line with the specimen, refocus on high power with the coarse adjustment
Focus on high power with the coarse adjustment, refocus on high power with the fine adjustment
Which of the following is an adaptation to the transport of substances in the xylem?
Companion cells provide the energy required for xylem transport
The ends of xylem vessels are perforated, like a sieve, so that substances can be transported
There are no end walls, and the side walls are thickened
How is a muscle adapted to its function
It contains protein filaments that slide over each other and cause contraction
Muscular tissue has many nuclei
Muscular tissue has few mitochondria
Which of the following is a feature of eukaryotic cells not present in prokaryotic cells?