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Gennadij [26K]
3 years ago
6

Kathleen is testing a mixture containing a certain substance. She takes a sample from the top and the bottom. The sample from th

e bottom has more of the substance than the sample from the top. What is this mixture?
Biology
1 answer:
Nat2105 [25]3 years ago
7 0

Answer:

w mixture of water and sand

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Oxygen is a by-product of ______________ and is needed by living organisms for the process of ______________.
Katyanochek1 [597]
The answer is D, photosynthesis and respiration.


—Evidence—

Oxygen is a byproduct of photosynthesis and, correspondingly, carbon dioxide the byproduct of respiration.

Oxygen gives our cells the ability to break down food in order to get the energy we need to survive. Although other animals may use different organs to breathe with, they all get oxygen into their bodies through respiration.
4 0
3 years ago
what is the defining characteristic of eukaryotic cells? what types of organisms have eukaryotic cells?
solniwko [45]

Answer: What is the defining characteristic of eukaryotic cells? Put these in your own words.

Eukaryotic cells are defined by the presence of a nucleus containing the DNA genome and bound by a nuclear membrane (or nuclear envelope) composed of two lipid bilayers that regulate transport of materials into and out of the nucleus through nuclear pores.

What types of organisms have eukaryotic cells?

There is a wide range of eukaryotic organisms, including all animals, plants, fungi, and protists, as well as most algae. Eukaryotes may be either single-celled or multicellular.

4 0
2 years ago
The diagram below shows the chemical structure of a type of lipid molecule called a phospholipid.
SVEN [57.7K]

Answer No 1:

Phospholipids are made up of phosphorus head and two fatty acid molecules.  These phosphorus head and fatty acid tail is joined together by glycerol. Fatty acid molecules are made up of Carbon, hydrogen and oxyge. Hence,carbon and hydrogen can be said as two other elements present in phospholipids.

Answer No 2:

The building blocks of lipids are glycerol and fatty acids.

Lipids can be described as vital organic molecules which are not soluble in water. They are made up of chains of carbon, hydrogen and oxygen. Someof the examples of lipids are fats and oils. Lipids are the main molecules present in an organisms cell membrane and hence have huge biological importance.

Answer No 3:

Lipids are biologically important molecules as they play very vital roles in the functioning of an organisms body. Two of the functions of lipids are:

  • Lipids and phosphorus molecules combine to form phospholipids. The phospholipids are the main molecules out of which the cell membrane is made. Hence, lipids play an essential role in providing the cell membrane its structure.
  • Lipids store energy and provide insulation to the body of an organism.
6 0
3 years ago
Each cell has a structure that separates the inside of the cell from.the environment. What cell is this?
kotykmax [81]

Answer:

Either the cell wall or the cell membrane.

Explanation:

All cells have cell membranes which line the outside of the cell, and some cells have cell walls, which also line the outside of the cell. Since all cells have cell membranes I am inclined to believe that the correct answer would be cell membranes.

8 0
3 years ago
All organisms require nitrogen to make amino acids, which in turn are used to build what?
Stolb23 [73]
Amino acids are used in the production of proteins!
6 0
2 years ago
Read 2 more answers
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