Question 1

Which of the following statements about bacteria is correct?

Accepted Answer

Beneficial bacteria far outnumber harmful bacteria.

Question 2

What do the domains Archaea and Bacteria have in common?

Accepted Answer

Both lack a nucleus and are prokaryotic.

Question 3

A scientist discovers a prokaryote in a hot spring that contains a chlorophyll-like pigment and an enzyme for fixing atmospheric CO$$_2. $$What is its likely mode of nutrition?

Accepted Answer

Photoautotrophy

Question 4

Which of the following is a resistant cell produced by some prokaryotes to survive harsh conditions?

Accepted Answer

Endospore

Question 5

Which group of bacteria includes members that perform plantlike photosynthesis?

Accepted Answer

Cyanobacteria

Question 6

Which type of Archaea is commonly found in the digestive tracts of cattle?

Accepted Answer

Methanogens

Question 7

Which of the following best describes the DNA of prokaryotes compared to eukaryotes?

Accepted Answer

Prokaryotic DNA is circular and found in the cytoplasm.

Question 8

Using bacteria to clean up an oil spill is an example of which process?

Accepted Answer

Bioremediation

Question 9

Which of the following is NOT a characteristic shared by Archaea and Eukarya?

Accepted Answer

Presence of a nucleus

Question 10

Which of the following statements about protists is correct?

Accepted Answer

Protists are eukaryotic organisms that are not plants, animals, or fungi.

Question 11

Which of the following is NOT a mode of nutrition found in the supergroup Excavata?

Accepted Answer

None of the above; all are found in Excavata.

Question 12

Which clade of the SAR supergroup does NOT contain any autotrophs?

Accepted Answer

Rhizaria

Question 13

Which of the following best explains why seaweeds are not considered plants?

Accepted Answer

Seaweeds are protists and do not have the complex tissues and organs found in plants.

Question 14

Which of the following is the closest living protist relative to animals?

Accepted Answer

Choanoflagellates

Question 15

A scientist is studying a biofilm on a medical implant. What is the primary reason why biofilms are difficult to remove with mouthwash alone?

Accepted Answer

Biofilms are organized colonies with protective matrices that resist chemical removal.

Question 16

Which of the following best describes the main difference between gram-positive and gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.

Question 17

Which of the following equations correctly represents the process of photosynthesis carried out by cyanobacteria?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 18

Which of the following is a real-world example of bioremediation?

Accepted Answer

Using bacteria to clean up oil spills in the ocean

Question 19

Which of the following best describes the nutritional mode of most members of Archaeplastida?

Accepted Answer

Photoautotrophy

Question 20

Which of the following is a key difference between cellular slime molds and plasmodial slime molds?

Accepted Answer

Cellular slime molds form multicellular aggregates, while plasmodial slime molds form a single multinucleate mass.

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