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olga55 [171]
3 years ago
9

Blood returning from the lungs enters theA. Left atriumB. Left ventricleC. Right atriumD. Right ventricleE. Aorta

Biology
1 answer:
Tpy6a [65]3 years ago
5 0

The answer is A. Left atrium

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When is a hypothesis considered scientific?
Ronch [10]

A hypothesis is considered scientific if it has something that can be supported or refuted through carefully crafted experimentation or observation

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3 years ago
1. More receptors result in<br> _sensitivity<br> increased, decreased
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Answer: increased

Explanation: the more you have the better you can tell where something is acting on you, ie touch

7 0
3 years ago
which of the macromolecules tested in this exercise (proteins, lipids, nucleic acids) were formed by dehydration reactions? expl
aalyn [17]

Large polymers are created during dehydration synthesis, which are typically referred to as biological macromolecules. These compounds include proteins, lipids, carbohydrates, and nucleic acids.

As a result, the dehydration reaction is responsible for the formation of protein, lipid, and nucleic acids.

1. Protein structure

  • Amino acid polymers form proteins. There are four different types of proteins, based on structure.
  • The amino acid sequence of a protein is represented by its primary structure, which is a linear chain.
  • The backbone (main chain) atoms of a polypeptide are arranged locally in space to form the protein's secondary structure.
  • A polypeptide chain's whole three-dimensional structure is referred to as a protein's tertiary structure.
  • The protein's quaternary structure, which is a three-dimensional arrangement of the subunits of a multi-subunit protein.

2. Lipid structure is a crucial element of the cell membrane. The structure is mostly composed of a glycerol backbone, two hydrophobic fatty acid tails, and a hydrophilic phosphate group.

3. Nucleic acids' structure: Nucleotide polymers make up nucleic acids. Each nucleotide is made up of an aromatic base with a N-atom connected to a pentose sugar with five carbons, which is then joined to a phosphate group.

To know more about biological macromolecules visit:

brainly.com/question/2141678

#SPJ4

7 0
2 years ago
The partial pressure of carbon dioxide in venous blood is approximately
Elena L [17]

at sea level in arterial blood it is between 35 mmHg and 45 mmHg. at sea level in venous blood it is between 40 mmHg and 50 mmHg
I hope this is right and helps:)
7 0
3 years ago
Objects that are further away from one another, have<br> more gravity?<br> True<br> False
mafiozo [28]
The answer is false
6 0
3 years ago
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