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Murljashka [212]
3 years ago
5

What is an example of a physical change? having less ash than the paper that was burned to form it ice forming and then melting

back into water rust having a different identity than the iron it forms on the irreversible reaction of vinegar and baking soda
Biology
2 answers:
kondaur [170]3 years ago
8 0

Answer;

-Ice forming and then melting back into water

Explanation;

-A physical change is any change in matter that involves the substance going from one physical state to another. The reference to a physical state involves solids, liquids, and gases. When a substance undergoes a physical change it does not lose its original properties when changing from one phase to another.

-Examples of physical changes include;

  • Ice melting involves a change from a solid to a liquid and the substances maintain the properties of water because the molecules never change.
  • Water boiling is a physical change as water molecules vibrate faster, they enter the gas phase and become water vapor.
VARVARA [1.3K]3 years ago
7 0
The answer to your question is ''ice forming and then melting back into water''
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Choose the term that best matches the description given. Treatments that destroy or decrease the growth of a microbe infection i
swat32

Answer: The correct option is D (Antimicrobials).

Explanation:

Antimicrobial treatment is defined as therapies that are given to patients to either inhibit or kill the growth of microorganisms IN their body cells. The antimicrobial treatment can be grouped into two based on their mechanism of action. These includes:

--> Microbiocidal therapy: This type of treatment when given, kills the microorganisms in the cells of the patient.

--> Microbiostatic therapy: This type of treatment aims at inhibiting the growth of microorganisms when administered to a patient.

The antimicrobial drugs achieve their role usually through their different modes of action which includes:

--> cell wall inhibition

--> inhibition of cell membrane function

--> protein and nucleic acid synthesis inhibition.

Disinfects, antiseptic and sterilisation are all different ways of eliminating microorganisms but not used as invitro (within) treatment for patients. Therefore the term that best matches the description given is antimicrobials.

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2 years ago
Recall that two hydrogen bonds bind A and T, but three hydrogen bonds bind G and C. Because the stability of DNA is affected by
IrinaK [193]

Answer:

A molecule with 32 percent or more amount of Cytosine.

Explanation:

DNA is the genetic material of all the living organism but in few viruses, RNA can also acts as the genetic material. DNA contain nitrogenous bases ( adenine, guanine, thymine and cytosine), deoxyribose pentose sugar and the phosphate bond.

The triple bond is more stable than the double bond. Since, cytosine and guanine shows triple hydrogen bonding and shows more stability. The DNA molecule that contains more residues of guanine and cytosine is stable than the molecule containing adenine and thymine residues.

Thus, the answer is molecule with 32 percent or more amount of Cytosine.

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3 years ago
Which characteristic of viruses prevents them from being used as evidence to support cell theory?
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Answer:

Viruses replicate only inside host cells.

Explanation:

<u>Viruses are not used as evidence to support the cell theory because they are not considered a cell and cannot carry out vital life processes without getting into host cells. </u>

According to the cell theory, the cell is the basic unit of life, all living organisms are made up of cells and cells arose from preexisting cells. A virus that is not in a host cell is just a piece of DNA/RNA surrounded by a protein coat and is not capable of carrying out any life process for it to be considered living.

<em>Viruses are only able to reproduce and multiply when they get access to a living host. They use the genetic mechanisms of the host to replicate their DNA/RNA using the lytic or lysogenic cycle. Hence, they are not used to support the cell theory. </em>

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Explanation:

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