📌 Living organisms may be classified by size or by number of cells; this course uses the distinction between unicellular organisms, made of one cell, and multicellular organisms, made of several cells.
Yeasts and euglenas are unicellular organisms, whereas trees, humans, and zebrafish are multicellular organisms.
The vital functions are:
1. Which classification correctly distinguishes unicellular organisms from multicellular organisms?
2. Which grouping correctly classifies the organisms listed as unicellular or multicellular?
3. A researcher needs to examine the internal structures of a thin section of a cell at nanometric resolution. Which instrument is most appropriate?
What distinguishes unicellular from multicellular organisms?
Unicellular organisms have one cell, multicellular have several cells.
Which vital functions do all living organisms perform?
They grow, obtain nutrients, reproduce, and defend themselves.
What resolution does a transmission electron microscope provide?
Nanometric resolution.
What type of images does a scanning electron microscope produce?
Detailed three-dimensional images of object surfaces.
What type of organism is Plasmodium and what disease does it cause?
A unicellular eukaryotic human parasite causing malaria.
What defines an organelle in a cell?
A cell compartment bounded by membranes performing a specific function.
It covers the core concepts of Organization of Living Things, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.
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