Applied Science – LIFE CFA #1 – Single Cells

Multiple Choice

Identify the choice that best completes the statement or answers the question.

____ 1. This is the structure of

a. / a virus.
b. / an archaean.
c. / a methane producer.
d. / a bacterium.

____ 2. What three characteristics are used to classify prokaryotes?

a. / by size, where they live, and whether they need air
b. / whether they have cell walls, flagella or cilia, and nuclei
c. / how they reproduce, where they get food, and whether they have DNA
d. / by shape, how they move, and how they get energy

____ 3. During what process do prokaryotes exchange genetic information?

a. / cell division
b. / binary fission
c. / conjugation
d. / endospore formation

____ 4. Which of the following is NOT a way in which humans rely on prokaryotes?

a. / to digest petroleum from oil spill
b. / to produce foods such as yogurt
c. / to synthesize drugs
d. / to form a symbiotic relationship and obtain ammonia

____ 5. What is the basic structure of a virus?

a. / DNA or RNA surrounded by a protein coat
b. / a capsid surrounded by a protein coat
c. / a bacteriophage surrounded by a membrane
d. / a tiny cell surrounded by a cell wall

____ 6. Which of the following characteristics of living things is NOT true about viruses?

a. / contain genetic material
b. / evolve over time
c. / obtain and use energy
d. / able to reproduce

____ 7. How do bacteria cause disease?

a. / by entering and bursting cells
b. / by maintaining homeostasis
c. / by reproducing very quickly
d. / by destroying cells and releasing toxins

____ 8. Which of the following will NOT prevent many bacterial infections?

a. / allowing foods to cool completely before refrigerating
b. / washing hands and surfaces with soap and water
c. / storing food in a refrigerator
d. / heating objects to very high temperatures

____ 9. What might people do to prevent the development of more superbugs?

a. / They should use antibiotics only when necessary.
b. / They should develop stronger antibiotics and use them often.
c. / They should use stronger disinfectants.
d. / They should not get vaccinated.

____ 10. Viral diseases can be

a. / treated with antibiotics and prevented with vaccines.
b. / treated with vaccines and prevented with antibiotics.
c. / prevented with antibiotics but not treated with vaccines.
d. / prevented with vaccines but not treated with antibiotics.

____ 11. What are protists?

a. / prokaryotes that are part of Domain Archaea
b. / eukaryotes that are not part of the plant, animal, or fungi kingdoms
c. / single-celled organisms that belong to the plant, animal, and fungi kingdoms
d. / single-celled eukaryotes that are part of the plant and fungi kingdoms

____ 12. What is one reason why the classification of protists in one kingdom is difficult?

a. / Some protists are unicellular while other protists are multicellular.
b. / Protists more closely resemble members of other eukaryotic kingdoms than they do other protists.
c. / Protists may be funguslike, plantlike, or animal-like, but they do not have characteristics of more than one of these groups.
d. / Because they are unicellular, protists fit better in the two domains of prokaryotes.

Figure 21–2

____ 13. The organism shown in Figure 21–2 is an example of

a. / a flagellate.
b. / a ciliate.
c. / an amoeba.
d. / a spore-forming protist.

____ 14. During what process do two protists exchange genetic material?

a. / cell division
b. / meiosis
c. / conjugation
d. / mitosis

____ 15. Which of the following will NOT happen when people release large amounts of sewage into bodies of water?

a. / Protists may break down the sewage.
b. / An algal bloom may occur.
c. / The sewage will provide shelter for phytoplankton.
d. / A buildup of toxins produced by protists may poison fish.

Figure 21–4

____ 16. Based on the Plasmodium life cycle shown in Figure 21–4, what would happen if the mosquitoes disappeared?

a. / Plasmodium merozoites would form, but gametes would not form.
b. / The Plasmodium life cycle would continue, and humans would become the only host.
c. / Plasmodium infection would continue because it will be passed from person to person.
d. / The Plasmodium life cycle would be interrupted, and the infection could not be passed on.

Constructed Response (4 points)

17. You are a scientist in a lab. Under a microscope you see a very small cell, living in a colony with a spiral shape. Your lab partner is unsure if this is a virus, bacteria cell, or protist cell. Using your knowledge on cell structure and characteristics of life, explain what type of cell you and your partner are observing and how you came to your conclusion.