1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kirill [66]
3 years ago
15

A bacterial culture is being tested for its ability to reduce nitrate. After incubation and growth of the bacteria in nitrate br

oth, there is no accumulation of gas in the Durham tube. The test for the presence of nitrite is colorless. When zinc powder is added, a bright red color develops. Interpret these results.
Biology
1 answer:
skelet666 [1.2K]3 years ago
8 0

Answer:

All this combination of reactions is summarized in that the bacteria reduced nitrate, that is, they added protons to said compound, giving nitrite as a product.

By promoting the appearance of nitrite and that it increases in its concentrations when the zinc dust is thrown away, it becomes reddish since there was a change in pH, that is, the medium was acidified.

Explanation:

Some bacteria take nitrate as a source and end up generating an oxide reduction reaction that gives nitrite as a product, if this reaction advances in a chain, that is, the nitrite is reduced after the nitrate, the product in the future would be ammonia

You might be interested in
What do Ionic pumps maintain
taurus [48]
Do you mean ion pumps in the membrane of cell?
If so, then ion pumps maintain an electrochemical gradient across the membrane. 
3 0
3 years ago
On June 21 are there more hours of daylight in sanfrancisco or at the equator
pav-90 [236]
There would be more hours of sunlight at the equator
4 0
2 years ago
Which is a applicable description of cancer?
Kamila [148]
The disease caused by a uncontrolled division of abnormal cells in a part of the body!
 Have a nice day!
:) 
7 0
2 years ago
Read 2 more answers
Which cell stucture contain the cell genetic material and controls manyof the cells activities
Rzqust [24]
It's the nucleus as it contain the DNA
7 0
3 years ago
Which event signals the birth of a star?
juin [17]

Answer:

nuclear fusion

Explanation:

When the density and temperature at the core of the gravitationally collapsing nebula reaches values when nuclear fusion is triggered and sustained, that marks the birth of the star.

7 0
3 years ago
Read 2 more answers
Other questions:
  • How are mitosis and meiosis similar?
    11·2 answers
  • Can someone please help me on question 115
    13·1 answer
  • The illustration shows an ocean food chain and the concentrations of the toxin DDT at each trophic level. What conclusions can b
    8·1 answer
  • Someone with one recessive and one dominant gene is called what?
    7·1 answer
  • The identity of the atom is based on A. the number of protons it has. B. the number of electrons it has. C. the number of neutro
    5·1 answer
  • What drives deep ocean currents?
    7·1 answer
  • Please help with 4-9
    6·1 answer
  • How does the moon look
    6·2 answers
  • Indicate whether each is characteristic of lytic or lysogenic reproductive cycle.
    13·1 answer
  • Which statements describe the six elements found in all living things? Check all that apply.
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!