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
Romashka [77]
3 years ago
6

Why is HCl poured on the DNase test agar plates that you inoculated last period?

Biology
2 answers:
astra-53 [7]3 years ago
8 0

Answer:The right option is A( to cause intact DNA to precipitate,so the activity of DNase can be determined.

Explanation:

Deoxyribonuclease(DNase) test is used to determine the ability of an organism, usually of bacteria origin, to hydrolyse

DNA ( deoxyribonucleic acid). The organism uses the DNA present as a source of carbon and energy for growth. The DNase medium is grouped as a differential medium as it helps distinguish organisms able to produce DNase from non producing organisms. The medium is pale green in colour because of the DNA- methyl green complex. Methyl green( the indicator) is a cation which binds to the negatively charged DNA.

When an organism is inoculated onto the medium, if the organism that grows in the medium produces DNase,DNA will be broken down leading to the release of free methyl green cation in the medium. The green colour of medium fades and the colony is surrounded by a colourless zone.

But when the DNase agar is prepared without an indicator (methyl green), HCL is used for easy identification of the DNase activity.

tia_tia [17]3 years ago
4 0

Answer:

A. To cause intact DNA to precipitate, so the activity of DNase can be determined.

Explanation:

The presence of DNase is special feature for some species of bacteria and can be used for identifying them. During DNase test, diluted hydrochloric acid (HCl) can be poured onto the agar plates so that there will be a clear zone close to the bacteria colonies. Each nucleotides are soluble in diluted HCl. But DNA is not soluble in the diluted HCl, thereby making the DNA to precipitate in the rest of the plate.

You might be interested in
A mutation of the proteolytic enzyme Trypsin results in a stable covalent bond between one of the catalytic amino acids of the p
borishaifa [10]

b. The enzyme and substrate would be stuck together.

3 0
3 years ago
Albert von Kölliker was the first researcher to isolate mitochondria, which are A) the structures in the center of cells that co
Georgia [21]

Answer:

The correct answer is B

Explanation:

Mitochondria are membrane-bound cellular organelles that are found in eukaryotic plant and animal cells that produce high energy compounds (called ATP) that are responsible for cellular activities.

NOTE: ATP (adenosine triphosphate) is described as the unit for energy in biology, hence the answer is B

4 0
3 years ago
What happens in the G2 phase of the cell cycle?
expeople1 [14]

Answer:

A. Prepares for cell division

Explanation:

The S phase is when the DNA divides, so B is incorrect.

The post mitotic phase (G0 phase) happens before the cell divides, so C is incorrect.

5 0
3 years ago
Read 2 more answers
Which statements describe the structure of each type of macromolecule? Check all that apply.
Volgvan
Statements A, B and D are correct.

Statement C is incorrect as hydrogen atoms are also present.
5 0
3 years ago
Read 2 more answers
An important method for controlling the spread of the h6n2 influenza (bird flu) virus in chickens is having a procedure to deter
nirvana33 [79]
If we consider the positive possibility of false negative and false positive for tests on individual chicken. Veterinary have developed a procedure to determine if the H6N2 virus is present in the flock of chickens. The veterinary select ten chickens randomly from the flock and perform Elisa test of the blood sample from each and every one of the ten chickens. 
By the conclusion of the veterinary if the H6N2 virus presents in flock if three out of ten chickens have positive Elisa.
6 0
3 years ago
Read 2 more answers
Other questions:
  • 20 points!!!!!
    10·1 answer
  • Everything in the universe is composed of energy and matter. Which one of these examples does not represent matter? * An atom of
    11·1 answer
  • Total magnification when the objective is at high power (also called 40x) is:
    13·1 answer
  • Richard is an avid gardener who spends a lot of time caring for the plants in his garden. To minimize damage from pests from his
    9·1 answer
  • Which process would enable a white blood cell to ingest a bacterium?
    14·1 answer
  • What is vermin composting​
    10·1 answer
  • Function of cell membrane in muscle cells
    6·1 answer
  • True or False: If a cell moves pass the M phase checkpoint this means that the DNA chromosomes are not correctly aligned in the
    11·1 answer
  • GTA: TAA mRNA UCA : CAU: AUU tRNA AGU : GUA : UAA rRNA Serine Valine Stop You need to solve the entire DNA line and then answer
    12·1 answer
  • How long does it take for a photon to travel through the convection zone
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!