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gavmur [86]
3 years ago
12

There are twenty amino acids in living organisms. Ten of these are referred to as essential amino acids. Why are they called ess

ential amino acids? These amino acids are the only ones that are important for the body to function properly. These amino acids cannot be made by the human body and must be consumed in one’s diet. These amino acids are the only ones that are made by the human body.
Biology
2 answers:
KATRIN_1 [288]3 years ago
7 0

Answer:

B

Explanation:

Dahasolnce [82]3 years ago
3 0

Answer:

B

Explanation:

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What’s the answer to 17,18,19 please
STALIN [3.7K]

17. false

18. d

19. true

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3 years ago
Type of microscope that can maginify up to 2 million times
frutty [35]
They are called transmission electron microscopes.
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3 years ago
Indicate whether each of the following statements is true of depurination (DP), deamination (DA), or pyrimidine dimer formation
solniwko [45]

Answer:

- This process is caused by spontaneous hydrolysis of a glycosidic bond: depurination and deamination

- This process is induced by ultraviolet light:  pyrimidine dimer formation

- This can happen to guanine but not to cytosine: depurination

- This can happen to thymine but not to adenine:  pyrimidine dimer formation

- This can happen to thymine but not to cytosine: none

- Repair involves a DNA glycosylase: deamination

- Repair involves an endonuclease: depurination, deamination and  pyrimidine dimer formation

- Repair involves DNA ligase: depurination, deamination and  pyrimidine dimer formation

-  Repair depends on the existence of separate copies of the genetic information in the two strands of the double helix: depurination, deamination and  pyrimidine dimer formation

- Repair depends on cleavage of both strands of the double helix: none

Explanation:

Depurination is the loss of purine bases (either adenine or guanine), while deamination refers to the removal of an amino group. During depurination, a β-N-glycosidic bond is cleaved by hydrolysis and a nucleic base is released (either adenine or guanine). All DNA bases may undergo deamination, except thymine (since thymine does not have an amino group). The ultraviolet (UV) radiation can cause thymine or cytosine to form dimers (e.g., pyrimidine dimers), being thymine dimers the most common lesion when DNA is exposed to UV light. Pyrimidine dimers may be repaired by different excision mechanisms, e.g., nucleotide excision repair, where the recognition of the DNA damage leads to the removal of the DNA fragment containing the lesion. DNA glycosylases are enzymes involved in the mechanism of base excision, these enzymes recognize and remove damaged bases by hydrolysis of the glycosidic bond, producing an abasic (apurinic and apyrimidinic) site. A DNA ligase enzyme covalently joins two DNA molecules by forming a phosphodiester bond, which is required during these processes.

8 0
3 years ago
Gregor mendel formulated his laws of heredity in 1860 before
JulijaS [17]

Answer:

In explanation.

Explanation:

Gregor Mendel formulated his laws of heredity in 1860 before...

-The structure of DNA was known, the existence of chromosomes and genes were known and the mechanisms which create variation in offspring were known.

If your quiz is like this:

Question: Gregor Mendel formulated his laws of heredity in 1860 before ________.

A). The structure of DNA was known.

B). The existence of chromosomes and genes was known.

C). The mechanisms which create variation in offspring were known.

D). All of the choices above are correct.

E). An understanding of mitosis and meiosis was known.

The correct answer is the "D" because yes after Gregor Mendel formulated his laws of heredity in 1860 the structure of DNA was known, the existence of chromosomes and genes were known and the mechanisms which create variation in offspring were known. (Referring that A, B, and C are correct).

Hope this helps.

8 0
3 years ago
What is the role of cartilage in the rib cage?
VashaNatasha [74]

Answer:

The costal cartilage connects the ribs to the sternum. Costal cartilage normally allows forward movement of the ribs, providing flexibility to the chest wall. There are usually 12 pairs of cartilage associated with the rib cage.

please consider as brainlest if useful

3 0
2 years ago
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