BIOLOGY HIGH SCHOOL

Which sequence represents a cross section of the bilayer

Answers

Answer 1
Answer:

hydrophillic head, hydrophobic tail, hydrophobic tail, hydrophillic head
Answer 2
Answer:

Answer:

The correct order would be a hydrophilic head, hydrophobic tail, hydrophobic tail, and hydrophilic head.

The plasma membrane is a lipid bilayer, that is, a layer formed of two layers of phospholipids.

A phospholipid is made up of two parts; hydrophilic polar heads and hydrophobic lipid tail.

The two layers are arranged in such a way that the hydrophilic parts are present outwards and the hydrophobic tails are sandwiched between the polar heads of two layers.  

Thus, the order would be a hydrophilic head, hydrophobic tail, hydrophobic tail, and hydrophilic head.

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What three principles is gas exchange based on in the respiratory system?

Answers

Answer: Ventilation, diffusion, and perfusion

Explanation:

Final answer:

The three key principles based on which gas exchange happens in the respiratory system are: partial pressure difference, large surface area for exchange, and effective transportation of gases.

Explanation:

The respiratory system relies on three main principles for gas exchange:

  1. Partial pressure difference: The exchange of gases (oxygen and carbon dioxide) in the lungs happens according to the differences in partial pressures. Oxygen moves from areas of higher to lower partial pressure, enabling it to enter the bloodstream where its pressure is lower.
  2. Surface area for exchange: The structure of the lung surface, specifically the alveoli, provides a large surface area for effective gas exchange.
  3. Transport of gases: Gases like oxygen and carbon dioxide are carried in the bloodstream. Oxygen is primarily carried attached to hemoglobin in red blood cells, while carbon dioxide is primarily transported in plasma as bicarbonate ions.

Learn more about Gas Exchange in Respiratory System here:

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Most Europeans were anxious to explore the unknown because they hoped to better their situation, their country, or their religious groups. true or false?

Answers

Most Europeans were indeed anxious to explore the unkown because they were going to the new place in the first place in order for them to improve their own standing in society. By going to new lands, they hoped to improve this. And they had a lot of reason to be anxious as well - the new lands were shown to be quite difficult to safely traverse. 

When does the cell have to use active transport ?

Answers

The cell has to use active transport when it's trying to transport material against the concentration gradient. (from low to high concentration) Or, if a molecule is too big to diffuse through the cell membrane, it must be moved through using a carrier protein.
Hope that helped you.

How can the excessive use of fertilizers effect biodiversity if it is washed into the river

Answers

We know that fertilizier could promote the growth of the plant

When washed to the river, it will accelerate the growth of the water plant that exist within that area,
This occurrence will be not beneficial to the water animal because their habitat will be unnaturally blocked by these plants

hope this helps

What might be an advantage of having more than one codon for the same amino acid?

Answers

There is no chance to change the amino acid sequence if any change occurs in the DNA or RNA sequence is an advantage of having more than one codon for the same amino acid.

What is genetic code?

Genetic code is the information of the gene which codes into the amino acid which makes the particular protein.

DNA has information that is passed to the RNA by the process of transcription and this RNA sequence makes a triplet codon which makes an amino acid.

This code is universal and shows redundancy, by this more than one codon makes the same amino acid, if any nucleotide sequence change occurs between the DNA and RNA, there is no effect on the protein sequence.

Therefore, protein is the linear sequence of amino acid if any change occur in the one codon, but leads to create the same amino acid, do not affect the protien.

Learn more about genetic code, here:

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The extra codons mean the code is more resilient- small errors can still result in the same protein being produced. The other advantage is that in some cases, a single strand of genetic material might code for more than one protein or enzyme, depending on how it is read. This means that one method of reading will produce the same output, but the second or third method of reading (starting from a different place on the strand) can produce other, entirely different materials. This concept is like a palimpsest.

Rigor mortis typically disappears after how many hours?

Answers

The answer is 8-12 hours.

Rigor mortis is caused by chemical reactions in muscles after death. Usually, parts of the body become stiffened because ATP is lost after death. After death oxygen concentration in the body decreases because ATP is still being produced and respiration is stopped. When there is no oxygen, anaerobic glycolysis produces ATP using glycogen. When glycogen is depleted, ATP production stops, and rigor mortis begins 2 hours after death. ATP is required during muscle respiration, but now there is a limited concentration of ATP, and its production is stopped. So, muscles could not be relaxed. 8-12 hours after death, muscle fibers are decomposed by enzymes or bacteria, and body relaxes, exiting rigor mortis.

Answer: The answer is not 8-12 hours

Explanation:

That 8-12 hours is for Liver Mortis.

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