Question: A cell typically contains _____ water.
Answer Choices:
40%
15%
5%
70%
Answer: 70%
Question: All organisms require an influx of substances from their habitat to meet their — needs for chemical elements and energy.
Answer Choices:
(No answer options provided)
Answer: nutritional
Question: Micronutrients (zinc, manganese) that are required by cells in small amounts are termed _____ elements.
Answer Choices:
(No answer options provided)
Answer: trace
Question: Which organism relies upon organic compounds for its carbon and energy needs?
Answer Choices:
Autotroph
Heterotroph
Phototroph
Answer: Heterotroph
Question: Which of the following are essential nutrients for microbes? [Note that these are usually needed in large amounts.]
Answer Choices:
Phosphate
Oxygen
Nitrogen
Magnesium
Iron
Carbon
Hydrogen
Sulfur
Answer: Phosphate, Oxygen, Nitrogen, Carbon, Hydrogen, Sulfur
Question: The most abundant of cellular chemicals is _____, present at a percentage of 70%.
Answer Choices:
(No answer options provided)
Answer: water
Question: An organism that uses inorganic CO₂ as its carbon source is a(n) _____, while an organism requiring carbon in an organic form is a(n) _____
Answer Choices:
heterotroph; autotroph
autotroph; heterotroph
Answer: autotroph; heterotroph
Question: Which of the following are essential nutrients for microbes? [Note that these are usually needed in large amounts.]
Answer Choices:
Magnesium
Hydrogen
Iron
Oxygen
Phosphate
Carbon
Sulfur
Nitrogen
Answer: Hydrogen, Oxygen, Phosphate, Carbon, Sulfur, Nitrogen
Question: Which organism relies upon organic compounds for its carbon and energy needs?
Answer Choices:
Autotroph
Heterotroph
Phototroph
Answer: Heterotroph
Question: Which term describes chemical substances such as carbon, hydrogen, and oxygen that are required in large quantities by cells?
Answer Choices:
Macronutrients
Macromolecules
Macrocompounds
Megamolecules
Answer: Macronutrients
Question: The nutritional type of a specific microbe is determined by its sources of _____
Answer Choices:
carbon and oxygen
oxygen and energy
carbon and energy
carbon and hydrogen
Answer: carbon and energy
Question: A microbe that requires only inorganic nutrients and carbon dioxide as a sole carbon source is called a(n) _____
Answer Choices:
(No answer options provided)
Answer: autotroph
Question: Which term describes chemical substances such as carbon, hydrogen, and oxygen that are required in large quantities by cells?
Answer Choices:
Macronutrients
Macromolecules
Macrocompounds
Megamolecules
Answer: Macronutrients
Question: What determines a microbe’s nutritional type?
Answer Choices:
oxygen preference
source of carbon
source of trace elements
source of energy
Answer: source of carbon, source of energy
Question: What is an inorganic nutrient?
Answer Choices:
atom or molecule containing elements besides carbon and hydrogen
atom or molecule containing hydrogen and oxygen
atom or molecule containing elements besides oxygen and hydrogen
Answer: atom or molecule containing elements besides carbon and hydrogen
Question: What term is used to describe organisms that can generate their own food from inorganic compounds?
Answer Choices:
Heterotrophs
Saprotrophs
Autotrophs
Answer: Autotrophs
Question: An organism that uses inorganic CO₂ as its carbon source is a(n) _____, while an organism requiring carbon in an organic form is a(n) _____
Answer Choices:
heterotroph; autotroph
autotroph; heterotroph
Answer: autotroph; heterotroph
Question: Micronutrients (zinc, manganese) that are required by cells in small amounts are termed _____ elements.
Answer Choices:
(No answer options provided)
Answer: trace
Question: A photoautotroph uses _____ for energy and _____ for its carbon needs.
Answer Choices:
light; CO2
organic chemicals; inorganic chemicals
inorganic chemicals; CO2
CO2; light
Answer: light; CO2
Question: Which of the following is NOT a good example of a chemoheterotroph?
Answer Choices:
Plants
Humans
Fungi
Bacteria
Answer: Plants