Discuss how protists can be distinguished from each of the following: viruses, bacteria, fungi, plants, and animals.
What will be an ideal response?
First, protists can be distinguished from viruses because they have a cellular structure (cell membrane,
cytoplasm, ribosomes, etc.) and viruses don't. They also differ from bacteria simply because they are
eukaryotes, and bacteria are prokaryotes. Protists possess a nucleus and various organelles, all of
which are lacking in bacteria. Protists do have features in common with fungi, animals, and plants.
Indeed, these three eukaryotic lineages arose from protist ancestors. However, protists have several
distinctive characteristics. For example, many protists lack cell walls, while true fungi possess them.
The cell walls that are found in protists typically contain different components than those found in
fungi (cellulose versus chitin). In contrast to land plants, protists lack highly differentiated structures
equivalent to true roots, stems, and leaves. They also lack the protective structures that encase
developing embryos in plants. Finally, protists are distinguished from animals by their lack of highly
differentiated structures such as limbs and a heart, and by the absence of features such as nerve cells,
complex developmental stages, and an internal digestive tract. Protists also lack collagen, the
characteristic extracellular support protein of animals.
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Indicate whether the statement is true or false.
Males are more commonly affected by X-linked recessive genetic disorders than females because ____
a. females have two X chromosomes; therefore, they do not inherit recessive alleles b. males have only one X chromosome; therefore, they express all recessive X-linked traits c. males have only one X chromosome; therefore, they have multiple alleles for each X-linked gene d. Y chromosomes cause X-linked gene mutations e. males are genetically weaker than females
The pressure-flow hypothesis describes
A. how carbohydrates in solution move through the phloem. B. how carbohydrates and minerals move through the xylem. C. how hormones move through the phloem. D. how carbohydrates enter the sieve tubes. E. how water and minerals move through the xylem.
Phototropins are light-activated kinases
____________________ What will be an ideal response?