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aleksandr82 [10.1K]
3 years ago
15

Which part of the earth system contains continents?

Biology
1 answer:
Olenka [21]3 years ago
6 0
Continents are land masses that exist on the surface of the earth. The continents are part of the uppermost layer of the earth which is called the crust. 
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In eukaryotes, how can a single gene code for several different proteins?
NikAS [45]

Answer:

Gene splicing is a post-transcriptional modification in which a single gene can code for multiple proteins. Gene Splicing is done in eukaryotes, prior to mRNA translation, by the differential inclusion or exclusion of regions of pre-mRNA. Gene splicing is an important source of protein diversity.

6 0
2 years ago
A person's blood type is determined by the:_______
matrenka [14]

Answer:

) Presence of specific glycoproteins on the cell membrane

Explanation:

When specif glycoproteins(antigens)  or antibody are present on a cell membrane of Red blood cell,they can  be used to identify the blood type.Antigens are substances capable of triggering an immune response in a cells.

In addition,they function in transport of molecules across the RBC. They help in the maintenance of the RBC,and aiding the arrest of cells capable of causing diseases to the body.

Therefore,they are good determinants of blood types,based on this two types of antigens present in a  blood type.

These two antigens  used for classification of blood types are the 1-the ABO antigens 2,the Rhesus antigens.

Essentially,when a WBC produces an antibody ,which is a molecule that defends the body,If this is not compatible,the antibody will recognize it as a foreign body and attack it.Thus such blood types are not compatible. Thus the antibody-antigen reaction are good for knowing and classify blood types.

Antigen can also be glycoprotein,carbohydrate or glycolipids.

Generally blood types are inherited from both parents.Therefore the antigen present on the RBC are combination of the alleles from each parent.

4 0
2 years ago
Hoe do compounds differ from elements
pogonyaev
Compounds are made up of elements.

Elements are the ones we pull straight out from the periodic table.

For example:
H2O, HCl, NaCl, NaOH --> these are all compounds

H, N, B, Ne, Na, Cl, O, K --> these are all elements.
4 0
3 years ago
What parts of your body is mainly made from proteins?<br> blood<br> skin<br> muscles<br> bone
Molodets [167]

Answer:

Explanation:

What are the three main building blocks of the body?

Nutrition Proteins: building blocks of the body. Excluding water and fat, the human body is made up almost entirely of protein. Protein is the main component of muscles, bones, organs, skin, and nails.

5 0
2 years ago
Read 2 more answers
PLEASE HELP ME ASAP!! IVE BEEN TRYING TO SOLVE THESE FOR 2 HOURS NOW!! :(
mojhsa [17]
First pic :
plants do not have cell membranes
(plants have BOTH cell membranes and cell walls)

second pic:
ATGC
(opposite strand of the DNA TACG)

third pic:
the second choice
(selectively permeable means only specific molecules could get in and go out)

fourth pic:
option 2
(cellular respiration takes sugar (or food) and makes it into ATP energy. this is what makes us have energy after we eat)

I really hope this helped :))
8 0
3 years ago
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