Biol 221 Lec 37 MCQ

Bacteria growing in the reservoir tank of a home drinking water system would be especially characterized by

• microcolony development

• rapid growth

• acid production

• biofilm formation

• formation of a sticky sheath

The process of making glucose or other cell carbon from CO2 . . .

• is an oxidation reaction

• releases energy for the cell to use

• requires that CO2 first be turned into methane

• can only be done by phototrophs

• can be done either aerobically or anaerobically

Tags

NGSS.HS-LS1-6

In a hydrothermal vent community, the sulfur and carbon cycles are often mixed. Organisms make organic compounds and SO4^2- from CO2 and H2S. During this process . . .

• energy must be input from the sun

• SO4^2- is used as the electron donor

• electrons from H2S are donated to CO2

• CO2 provides the energy for the organisms to grow

• H2S is reduced to SO4^2-

Tags

NGSS.HS-LS2-3

Which step in the carbon cycle requires net energy input?

• Methanogenesis

• Anaerobic respiration

• Fermentation

• Methylotrophy

• Aerobic electron transport

Tags

NGSS.HS-LS2-3

Efficient growth in flowing water (river) would be most improved by which of the following adaptations?

• Enhanced flagellar motility

• Sheaths to adhere better to surfaces

• ABC transporters for more efficient nutrient uptake

• A broad metabolic capability to degrade many potential carbon sources

• Ability to produce anti-quoromones to interfere with other bacterial communication

Tags

NGSS.HS-LS2-2

The indicated step in the nitrogen cycle is called...

• Assimilative nitrogen fixation

• Dissimilative nitrogen fixation

• Nitrification

• Denitrification

• Ammonification

Tags

NGSS.MS-LS2-3

The major evolutionary selection pressure in soil microorganisms favors organisms that have evolved...

• very efficient transporters

• adhesion pili that form very tight biofilms

• a rapid specific growth rate (μ)

• a highly versatile metabolism

• anoxygenic photosynthetic mechanisms

Tags

NGSS.HS-LS4-4

The indicated step in the nitrogen cycle is called...

• Dissimilative nitrogen fixation

• Assimilative nitrogen fixation

• Nitrification

• Denitrification

• Ammonification

Tags

NGSS.MS-LS2-3

Which of the steps in the nitrogen cycle can be carried out by lithotrophic organisms that use nitrogen compounds as an electron source?

• Ammonification

• Nitrification

• Assimilative Nitrogen Fixation

• Dissimilative Nitrogen Fixation

• Denitrification

A fungus living within the epidermal cells of a plant root is called...

• a mycorrhizome

• a lichen

• a bacteroid

• Phytophthora blight

• a Rhizobium nodule