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3 years ago

How does a cell handle misfolded proteins

1 answer:

5 0

<span>Cells primarily recognize exposed hydrophobic patches when identifying misfolded proteins. This is very prevalent in bacteria and I would assume that similar mechanisms are used in eukaryotes. There is also a system where misfolded proteins are tagged by different glycosylation patterns, but I don't remember much about that part.</span>

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Rank from the first to the last steps to describe the correct order of events of erythrocyte death.

timama [110]

Answer:

1. erythrocyte becomes trapped in the sinusoids of spleen.

2. Spleen macrophages digest the erythrocytes.

3. Hemoglobin is broken down into amino acids, iron and bilirubin.

4. Iron ions and amino acids are recycled to make new hemoglobin in red bone marrow. Bilirubin is sent to liver for excretion.

Explanation

Aging erythrocytes are trapped in the sinusoids of the spleen, where they are digested by macrophages. Within the macrophage, hemoglobin is broken down into amino acids, iron ions, and bilirubin.

Iron ions or heme ion and amino acids then move through the blood to the bone marrow, where they are recycled and used to create new hemoglobin. Bilirubin travels with the help of the blood to the liver, where it is modified and then excreted.

thus, the correct order is :

1. erythrocyte becomesrapped in the sinusoids of spleen.

2. Spleen macrophages digest the erythrocytes.

3. Hemoglobin is broken down into amino acids, iron and bilirubin.

4. Iron ions and amino acids are recycled to make new hemoglobin in red bone marrow. Bilirubin is sent to liver for excretion.

8 0

3 years ago

Which of the following statements about archaea are true cowan?A) They are prokaryotes.B) They lack peptidoglycan in their cell

Veseljchak [2.6K]

Answer:

All the options are true except option D.

Explanation:

Archaea are a group of prokaryotic organisms i.e. they lack a membrane bound nucleus. They are one of the the three domains of life (the other two being bacteria and eukarya). Archeans possess a cell wall like bacteria but it is not composed of peptidoglycan, like bacteria cell wall.

Archeans are generally known to be found in very severe environmental conditions, hence, they are referred to as extremophiles e.g Some are thermoacidophiles i.e. thrive in very hot and acidic environment while others are extreme halophiles i.e. thrive in salty regions. Archeans known as methanogens produce methane gas as a product of metabolism from carbon dioxide and hydrogen.

However, the domain archeae was only found to be in existence recently after the domain bacteria, hence, they are not considered to evolve before the domain bacteria.

3 0

3 years ago

In humans, brown eyes are dominant to blue eyes. If a blue-eyed man has children with a brown-eyed woman whose mother has blue e

nlexa [21]

Answer:

50%

Explanation:

This question involves a gene coding for eye color in humans. The allele for brown eyes (B) are dominant to blue eyes (b). This means that blue-eyed individual will possess genotype: bb.

According to this question, a blue-eyed man (bb) has children with a brown-eyed woman (B_) whose mother has blue eyes (bb). Since the mother of the brown-eyed woman has a blue eye, this means that the woman will be heterozygous for brown eye (Bb).

Hence, the parents in this question will cross as follows: blue eyed man (bb) × brown-eyed woman (Bb). The offspring/children will have the following genotypes (see attached punnet square); Bb, Bb, bb, bb.

Based on the question, 2/4 = 1/2 of the children will be heterozygous for the eye color trait. That is, ½ × 100 = 50%.

4 0

2 years ago

A man heterozygous for blood type A marries a woman heterozygous for blood type B. What could be the possible blood types of the

GenaCL600 [577]

Answer:

Heterozygous A: AO (remember, O type blood is a recessive allele. It's masked by A)

Heterozygous B: BB (h0m0zygous)

AO x BB --> AB, BO

Therefore, the genotypes of their offspring will be 1 AB to 1 BO, while the phenotypes will be 1 AB blood to 1 B blood.

I hope this answer helps you find what your looking for! :)

5 0

2 years ago

Read 2 more answers

How many bones are in the human ear?

Ostrovityanka [42]

The ear has the tinest bones in the body. There are three bones in the ear. Hopes this helps you.

5 0

2 years ago