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3 years ago

Any substance with constant composition

Biology

2 answers:

Dominik [7]3 years ago

6 0

Answer:

Pure substance

Explanation:

givi [52]3 years ago

4 0

Answer: carbon dioxide

Explanation:

A chemical substance is a form of matter having constant chemical composition and characteristic properties.[1][2] Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.[3] Chemical substances can be simple substances[4], chemical compounds, or alloys. Chemical elements may or may not be included in the definition, depending on expert viewpoint.[4]

Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical.

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Match the following

Brilliant_brown [7]

Answer:

Matches according to the terms

Explanation:

1. Stratosphere: The layer of the atmosphere that the ozone layer is part of

2.Recycle: the process by which certain waste materials, such glass, aluminum, and paper are prepared for reuse

3. Hazardous: the type of solid, liquid, or gas wastes that are

toxic,flammable, corrosive, reactive, or radioactive

4. Biodegradable: The type of wastes that can be broken down by other organisms into a reusable form

5.Nicotine: The addictive drug found in tobacco

6. Cancer: A disease frequently developed by smokers and passive smokers.

7.Diabetes: A disease of the pancreas in which insulin is not produced in

The correct amounts so that glucose can be converted into

energy or stored as fat (insulin not given in the option)

8.Ozone: Organic compounds (VOCs), and nitrogen dioxide (NO) are

acted upon by sunlight

9.Plastic: When burned, it can cause an increase of CO2, ozone, and sulfur dioxide in the atmosphere

10. Fossil fuel: Sulfur dioxide,aluminium,

11.Ozone: formed in the atmosphere when chemicals, called volatile

7 0

3 years ago

What term is used to describe organisms composed of identical and unspecialized cells?

Sedaia [141]

Answer:

Embryo cell or totipotent cell

Explanation:

All organisms during their embryonic stage also known as totipotent cells are composed of cells that are identical in structure and function. These cells can differentiate at a later stage and have the potential to become any cell i.e heart cell, eye cell etc. Embryo is thus just a mass of unspecialized cell which undergo differentiation to then convert into pluripotent and form tissues and hence the organ.

5 0

3 years ago

Human blood consistes og blood groups a b and o however there is one ab which contains a and b in the same geno type what i this

Salsk061 [2.6K]

It is Codominance. Examples for this phenomenon is ABO blood groups.

8 0

3 years ago

Which of the following is NOT the result of a mutation in the DNA sequence of an organism?

Mama L [17]

DNA is copied during mitosis and when the two resulting copies of DNA are compared they are found to contain the same order of nucleotides is not the result of mutation in the DNA sequence of an organism.

Explanation:

Mutation is the process

It is caused by certain chemicals called mutagens or by environmental factors.

In mutation the nucleotide get change which eventually changes the protein product.

In mutation purine base gets mutated to purine base and pyrimidine base gets mutated to pyrimidine only.

A single change in nucleotide is called point mutation and the effect occurring because of it is called frame shift mutations.

In S phase there are checkpoints which ensure that DNA replication is accurate and when mitosis follows it equal distribution of DNA takes place between the two daughter cells hence no mutation will takes place.

6 0

3 years ago

The layer of the pleural membrane that is attached to the surface of the lung is the

Dafna1 [17]

Answer:

Visceral pleura

Explanation:

The pleura forms the main component of the respiratory system whose main objective is to carry out the process of respiration without any difficulty and also to reduce friction during the time of breathing.

It is basically comprised of two types namely-

(1) The Parietal pleura

(2) The Visceral pleura

The visceral pleura can be usually referred to as one of the important and fine membranes that surround the surface of the lungs. It is separated by the parietal pleura due to the presence of a pleural fluid between them.

On the other hand, the parietal pleura is responsible for surrounding the internal portion of the chest cavity and is comparatively thicker than the visceral pleura.

7 0

3 years ago