1. Why do organisms carrying out nitrogen fixation require an environment with reduced levels of oxygen?

2. Provide two examples of how organisms fixing nitrogen avoid the "oxygen problem" that you discussed in your answer to #1.

answer

watching

views

For unlimited access to Homework Help, a Homework+ subscription is required.

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

Sixta KovacekLv2

12 Jul 2019

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Related questions

"Helps fix nitrogen in soil. Boost pea and bean yields with Garden Soil Inoculant. Simply shake granules into furrows as you plant. It contains nitrogen-fixing bacteria to promote stronger root systems and larger harvests. Easy-to-use sprinkler top makes application a snap. 8.7-oz. container treats a 150' row." This product is recommended for growing plants such as beans and peas, for all of the following reasons EXCEPT: These plants can convert nitrogen gas to ammonia

These plants can convert nitrogen gas to ammonia

These plants form symbiotic relationships with bacteria in the product.

These plants are legumes.

These plants produce root nodules that harbor bacteria.

Molecular nitrogen (nitrogen gas) makes up 78% of the Earthâs atmosphere, but is unavailable for use by all organisms except for some nitrogen-fixing ____. (Choose all correct answers.)

bacteria

cyanobacteria

eukaryotes

prokaryotes

fungi

Protists

Nitrogen gas is a chemically inert molecule. The prokaryotes that fix-nitrogen produce the enzyme nitrogenase. What does this enzyme do that allows these organisms to use nitrogen gas? (Hint: You might want to consult a chemistry book to help you with this answer.)

In biological nitrogen fixation (N2, ammonia, hydrogen, oxygen), is (Reduced, oxidized) when it accepts atoms, resulting in the production of (nitrogen gas, nitrate, water, ammonia ) .

Legumes produce (nitrogen, nitrogenase, lehemoglobin,oxygen ,bacteria) , which regulates the amount of (nitrogen, nitrogenase, lehemoglobin,oxygen ,bacteria) present in the root nodule so (nitrogen, nitrogenase, lehemoglobin,oxygen ,bacteria) activity is not inhibited.

Humans and other animals acquire their nitrogen from which of the following? (Choose all correct answers.)

protein from animals that eat other animals

protein from animals that eat plants

plant protein

protein from legumes

The nitrogen sources used by humans are (organic, inorganic) componds, while nitrogen gas is an (organic, inorganic) compound.

1-Describe one example of how genetic exchange can modify a bacterial genome, including the possible consequences of this modification for the bacterial cell.

2- If you wanted to carry out an enrichment experiment to enrich for nitrogen-fixing organisms in soil would you add ammonia to your culture broth? Why or why not?

3- What is the human microbiome? what are two important findings scientists have made from studying it?

indigolocust903

1. Complete the following chart:

Organism	Metabolizes oxygen	Growth in presence of oxygen	Growth in absence of oxygen	detoxifies byproduct of oxygen
Aerobe
Facultative anaerobe
Strict anaerobe
Aerotolerant
Microaerophile

2. Compare the results with growth on the aerobic control plate and describe the oxygen requirements of your organisms.

3. If an organism is a strict anaerobe, it cannot survive in the presence of oxygen even for a short time. How might you culture these organisms?

4. An aerobe, facultative anaerobe, strict anaerobe, and an aerotolerant anaerobe are inoculated on a medium in a sealed container with oxygen present. Explain what will happen.