exam 1 questions Flashcards
(11 cards)
You have a mutant bacterium that can no longer produce fimbriae. Due to this mutation, this
organism will be unable to do which of the following?
a. Adhere to other bacteria and to substances in the environment
b. Evade host defenses
c. Select which substances can enter into or exit the cell
d. Undergo metabolism
e. Retain moisture
a. Adhere to other bacteria and to substances in the environment
What is the final electron acceptor in aerobic respiration?
a. Oxygen
b. A cellular molecule that contains carbon and hydrogen
c. The electron transport chain
d. An inorganic molecule other than oxygen
e. An oxidized electron carrier
A. Oxygen
Why don’t algae cause infections or live inside humans?
a. Because they have simple reproductive structures
b. Because they are unicellular
c. Because they are multicellular
d. Because they are photosynthetic and do not rely on humans as a source of nutrition
e. Because they are found near the surface of fresh or salt waters
d. Because they are photosynthetic and do not rely on humans as a source of nutrition
Flu activity was widespread in most of the United States in late 2022 and early 2023. Although we
have not studied the influenza virus in class, you do know several facts about this virus. Which of
the following is NOT a characteristic of influenza virus?
a. It is acellular
b. It has a structure is more simple than that of a bacterium
c. It has an intracellular and extracellular state
d. It is a parasite
e. It is able to reproduce independently
e. It is able to reproduce independently
A bacterium moving via chemotaxis towards an environmental stimulus demonstrates which of the
following characteristics/processes of life?
a. Growth
b. Reproduction
c. Responsiveness
d. Metabolism
e. Cellular structure
C. Responsiveness
You receive the report on an unknown microbe you submitted for analysis. You microbe contains
all of the following: phospholipids, proteins, DNA, RNA, ribosomes, and polysaccharides, including
peptidoglycan. What general type of organism is this unknown microbe?
a. Bacteria
b. Archaea
c. Fungi
d. Protozoa
e. Algae
A. bacteria
Which of the following is NOT true of endospores?
a. One endospore germinates to form one viable bacterium
b. They often remain viable for several hundred years in soils
c. They are generally produced when nutrients are in abundance
d. They are very resistant to UV light
e. They are a defensive strategy against unfavorable conditions
c. They are generally produced when nutrients are in abundance
A fresh growth medium was inoculated with 1000 actively growing bacterial cells/ml that have a
generation time of 20 minutes. Predict how long it will be until the culture contains over 64,000
cells/ml.
a. 30 hours
b. 1 hour
c. 2 hours
d. 20 minutes
e. 6 hours
C. 2 hours
If it takes 6 hours for a population of bacteria to grow from 100 cells to 25,600 cells, what is the
generation time of this species?
a. 8 minutes
b. 1 hour
c. 45 minutes
d. 20 minutes
e. 6 hours
c. 45 minutes
While hiking in Kootenay National Park in Canada, you stop to take a break by an acidic hot
spring. You accidently drop your granola bar in the water, but grab it out immediately. Your
hiking partner tells you human pathogens have now contaminated your granola bar. What is your
response?
a. Yeah, you’re right. I’ll leave this granola bar for the critters.
b. No, you’re wrong. Human pathogens can only be found in the human body, so this granola bar is
perfectly fine.
c. No, you’re wrong. Human pathogens are mesophilic neutrophiles and will not be found in this
acidic hot spring.
d. No, you’re wrong. I grabbed the granola bar out of the hot spring before it could become
contaminated with human pathogens.
e. No, you’re wrong. Water is pure in nature
c. No, you’re wrong. Human pathogens are mesophilic neutrophiles and will not be found in this
acidic hot spring.
Over 80% of the planet Earth never gets above 5°C (41°F), but only in recent years have
scientists begun studying the microorganisms that live in these environments. By learning how
these organisms survive and even thrive in such conditions scientists gain insight as to how
microbes may live elsewhere in the Solar System. What would organisms living in these
environments be classified as?
a. Thermophiles
b. Psychrophiles
c. Mesophiles
d. Hyperthermophiles
e. Osmophiles
b. Psychrophiles
