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dem82 [27]
3 years ago
6

Which best describes stem cells? Differentiation creates specialized cells from stem cells. Self-renewal creates stem cells from

differentiated cells. Self-renewal creates differentiated cells from stem cells. Differentiation creates stem cells from specialized cells.
Biology
2 answers:
Mama L [17]3 years ago
6 0

Th e answer is letter A)Differentiation creates specialized cells from stem cells.


Romashka-Z-Leto [24]3 years ago
6 0

Answer:

Differentiation creates specialized cells from stem cells

Explanation:

Stem cells refers to the undifferentiated cells that are capable of repeated cell division. During each division in stem cell, at least one of the daughter cells usually remains a stem cell. The rest of the newly formed daughter cells differentiate as a specific cell type.

Example: Stem cells present in bone marrow of human give rise to red blood cells, white blood cells and platelets.

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What are two roles prokaryotes play in the cycling of elements in an ecosystem
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Prokaryotes have a significant role in decomposition of organic matter, bringing back key nutrients into the trophic network. By decomposing dead plant or animal parts, they enable the circulation of elements like phosphorus and sodium.
On the other hand, specialized bacteria have a role in transforming nitrogen compounds in the soil, converting them into chemical forms that are suitable for other organisms to use.
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3 years ago
Which of the following does NOT characterize proteins?
8090 [49]

Answer:

The answer is C) They appear to be the molecular carriers of coded hereditary information.

Explanation:

Why NOT C) They appear to be the molecular carriers of coded hereditary information?

This is the job of the nucleic acids. It is composed of nucleotides which are the basic units of DNA and RNA. They carry genetic information about a certain organism.

<h3 /><h3>True of proteins:</h3>

A) They may be denatured or coagulated by heat or acidity.

<u>Denaturation</u> is the <u>destruction of the protein's secondary and/or tertiary structures</u>. The <u>primary structure is not disrupted due to the tough peptide bonds</u> and can only be broken down by acid. For heat denaturation, hydrogen bonds are destroyed, as in cooking of egg whites and medical equipment sterilization.

B) They have both functional and structural roles in the body.

There are many kinds of proteins that have functional and structural roles like hormones <u>(FSH, LH)</u>, antibodies <u>(IgA, IgM),</u> enzymes <u>(lipase, amylase),</u> for storage/transport <u>(hemoglobin, ferritin)</u>, and locomotion <u>(actin, troponin).</u>

D) Their function depends on their three-dimensional shape.

Just like <u>hemoglobin</u>, it's <u>quaternary structure</u> can carry <u>4 molecules of iron</u> in one go. <u>Enzymes</u> are shaped accordingly to fit a<u> specific substrate</u> <em>(lock-and-key model)</em>

6 0
3 years ago
Which describes elements in the first group of the periodic table?
IrinaK [193]

Answer:

alkali metals

Explanation:

3 0
2 years ago
What is land pollution?
Gwar [14]
When people throw their garbage on the ground
3 0
3 years ago
Parathyroid hormone is the major regulator of the plasma concentration of__________ ions
photoshop1234 [79]

Answer:

Calcium

Explanation:

Parathyroid hormone (PTH) is a hormone that is secreted by the parathyroid gland. It is the major regulator of the plasma concentration of calcium ions. It regulates calcium ions in the kidney, intestine and bones.

In the kidney, is involved in the re-absorption of calcium in distal ducts and the renal collecting duct, it is also involved in activating the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol).

In the intestine,  PTH is involved in the absorption of calcium, by increasing vitamin D production.

In the bone, it helps in regulating calcium levels; when serum calcium level is low, PTH stimulates the activity of the osteoclast, to produce more calcium.

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3 years ago
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