(Earth & Space)(Will Vote Brainliest) Why is Earth an example of a system? A.Earth is a relatively large planet.

The virus that causes avian (bird) flu can attach to the cells of the lower part of the respiratory system in humans, but not to

umka21 [38]

Answer:

The correct answer is "receptors".

Explanation:

Virus infect and reproduce by recognizing specific receptors in their host cells. Virus-receptor binding is highly specific, this is the reason why some virus can infect only certain animals or plants at specific tissues. If the virus that causes avian flu attaches only to the cells of the lower part of the respiratory system, it is very likely that these cells have specific receptors that are not present in the upper part of the respiratory system, receptors that the viruses recognize.

7 0

3 years ago

Biologists use the fluid mosaic model to describe membrane structure.

allochka39001 [22]

<h2>The correct answers are enlisted below:</h2>

Explanation:

Three correct statements are:

Statement: 1.
Statement: 2.
Statement: 3.

The cell membrane is comprised of a phospholipid bilayer that remains interspersed with protein molecules.
Each phospholipid molecule is comprised of:

A glycerol molecule linked with the help of ester bonds to,
one phosphate group,
two fatty acid (saturated or unsaturated) molecules.

Being hydrophilic in nature, the phosphate group faces outside the lipid bilayer forming hydrogen bonds with the water molecules.

Being hydrophobic in nature, the fatty acid molecules faces to the interior of the bilayer avoiding contact with water and forming hydrophobic interactions with each other.
The saturated fatty acid molecules have a straight hydrocarbon chain as they lack any double bonds. However, the unsaturated fatty acid molecules possess multiple double bonds that generate a kink or bent in their structure. The kink causes the molecules to occupy more space in the bilayer and also help these molecules to move laterally about their position, thereby generating fluidity in the membrane.
The lateral movement of the lipid molecules also causes the lateral movement in the interspersed protein molecules.
The interspersed protein molecules has various functions like, they act as channel proteins, carrier proteins, receptor proteins, etc.

4 0

4 years ago

5. Evolution by natural selection was first put forth by

user100 [1]

Answer:

Charles Darwin and Alfred Russel wallace in the 19th century

so the answer is d

8 0

3 years ago

Which statement is an example of the chemical potential energy in adenosine triphosphate (ATP) being turned into work?

evablogger [386]

Answer:

The correct answer is option (C) "After splitting ATP, a protein changes shape to pump ions across a membrane".

Explanation:

Adenosine triphosphate (ATP) is an organic chemical molecule considered the "molecular unit of currency" of intracellular energy transfer, for the high level of energy that is released when ATP is breakdown into adenosine diphosphate (ADP). ATP provides energy to drive many processes in living cells. One example of how the chemical potential energy of this molecule is turned into work is that after splitting ATP, a protein changes shape to pump ions across a membrane. The energy of the splitting of ATP into ADP will provide energy for the protein being able to change shape, resulting in pumping ions across a membrane.

6 0

4 years ago

Ricky recently moved from a quiet rural area into a more chaotic urban location for work. He has been struggling to sleep due to

olchik [2.2K]

Answer:

吧b

Explanation:

4 0

3 years ago