Download Algae are photosynthetic protists [1].

GUIDED READING - Ch. 17 - Section 4 & 5
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NAME: __________________________________
Please print out these pages and HANDWRITE the answers directly on the printouts. Typed work or answers on
separate sheets of paper will not be accepted.
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Importantly, guided readings are NOT GROUP PROJECTS!!! You, and you alone, are to answer the questions as you read.
You are not to share them with another students or work together on filling it out. Please report any dishonest behavior to your instructor to be
dealt with accordingly.
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Get in the habit of writing legibly, neatly, and in a NORMAL, MEDIUM-SIZED FONT.
Please SCAN documents properly and upload them to Archie. Avoid taking photographs of or uploading dark, washed out,
side ways, or upside down homework. Please use the scanner in the school’s media lab if one is not at your disposal and keep completed
guides organized in your binder to use as study and review tools.
READ FOR UNDERSTANDING and not merely to complete an assignment. Though all the answers are in your textbook,
you should try to put answers in your own words, maintaining accuracy and the proper use of terminology, rather than blindly copying the
textbook whenever possible.
Protozoans are animal-like in how they obtain nutrients by ingesting, through phagocytosis often, organic
particles.
Slime molds, water molds, and downy mildews are fungus-like in that they secrete enzymes that
hydrolyze molecules extracellularly, absorbing these nutrients thereafter.
Finally there are those protists, algae, which behave like plants in that they making their own organic
molecules through photosynthesis.
Algae are photosynthetic protists [1].
1. Algae contain ________________________ organelles that can perform photosynthesis.
2. Many algae are unicellular, but some live in groups known as ______________________ while other
algae are multicellular organisms. Algae are classified into subgroups based on differences in cell
walls, photosynthetic pigments, structure, storage carbohydrates used, and DNA differences.
3. In what ways are euglenoids similar to dinoflagellates?
4. In what ways are euglenoids different from dinoflagellates?
5. a. The term plankton will show up again when you study ecology and food chains/webs. What are
plankton?
b. Remember that the word “community” refers to a localized group of populations (which are
themselves localized groups of organisms from the same species). Explain the differences between
phytoplankton and zooplankton.
c. Which one, phytoplankton or zooplankton, are the producers many aquatic consumers rely on as
food?
6. Every once in a while in the news there are stories of red tides in the ocean. What is red tide and why
can it be dangerous to other organisms in the water, including humans?
7. In what way are photosynthetic diatoms, which are also found in plankton communities, "glass-like" in
reference to their cell wall?
8. a. What are seaweeds?
b. In what ways are seaweeds different from plants?
c. What are the three groups of seaweed classified according to pigment content?
d. When growing bacteria in Petri dishes (see picture below), the microorganisms are grown on top of
a thick gel-like substance that contains essential nutrients, like sugars and amino acids. This
substance is called Agar after the polysaccharide extracted from _________ algae, which makes the
nutrient-containing liquid turn think and gelatinous when it cools (similar to Jello).
Bacteria can also be grown in flasks or test tubes in a liquid nutrient medium called broth.
9. What are distinguishing characteristics of brown, red, and green algae? [1]
Plants, fungi, and animals EVOLVED from protists!!! [1].
10. Where do biologists hypothesize eukaryotic protists evolved from?
11. How do scientists hypothesize that the first internal membranes of the Golgi apparatus, nuclear
envelope, and endoplasmic reticulum evolved?
12. What is the benefit of a cell acquiring internal membranes?
13. Describe how the theory of endosymbiosis explains the origin of first mitochondria and then
chloroplasts in eukaryotic cells. [1]
14. What evidence exists that supports this endosymbiotic origin of present-day mitochondria and
chloroplasts in eukaryotic cells?
15. Why does it no longer seem correct to group all protists in a single kingdom? [1]
[1] Campbell, Heyden, Williamson. 2006. Biology: Exploring Life. Prentice Hall: Boston, MA.