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3 years ago

Chief cells secrete inactive pepsinogen in order to prevent acid erosion inside of the chief cells. True or False

Biology

2 answers:

4vir4ik [10]3 years ago

5 0

Answer:

False

Explanation:

Chief cells usually secrete pepsinogen, but the product does not related is to acidity.therefore, Whenever

HCl secreted by the parietal cells activate pepsinogen, the pepsinogen is converted into pepsin, and pepsin is an enzyme that acts on proteins.

NOTE:

The gastric chief cell is one of the cells in our stomach that brings about the release of pepsinogen and chymosin. Pepsinogen is activated into the body's digestive enzyme pepsin and the pepsin will have contact with acid that is produced by gastric parietal cells.

Pepsinogen is substance that is secreted into gastric juice from both mucous cells and chief cells. After secretion pepsinogen is activated into the active protease pepsin by the stomach acid.the protease pepsin helps the stomach's ability to initiate digestion of proteins.

Irina18 [472]3 years ago

4 0

Answer:

False.

Explanation:

Pepsinogen is secreted by chief cells in gastric and mucous cells which has no digestive activit, but the result is unrelated to acidity.

However, once pepsinogen is secreted and comes in contact with previously formed pepsin in the presence of HCl, it is immediately activated to form active pepsin. Pepsin is an active proteolytic enzyme (for digesting protiens) in a highly acidic medium (optimum pH 2) and above a pH of about 5, it has a little proteolytic activity and soon becomes incompletely inactivated. Hence, HCl secretion is just as necessary as pepsin secretion for protien digestion in the stomach.

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The video compares the key similarities and differences between mitosis and meiosis. Determine which events occur in mitosis, me

notka56 [123]

Answer:

Mitosis:

A single division occurs, separating sister chromatids

End result is two diploid cells that are genetically identical to each other and the parent cell

Meiosis:

The first division separates homologous pairs; the second division separates sister chromatids

Homologous chromosomes pair up and form chiasmata

Homologous pairs of chromosomes line up on the metaphase plate

Daughter cells contain recombinant chromosomes

End result is four haploid cells that are genetically different from each other and the parent cell

Mitosis and Meiosis:

Chromosomes duplicate during interphase

Process starts with a diploid cell

Duplicated chromosomes line up Individually on the metaphase plate in a diploid cell

Explanation:

Mitosis is the division of vegetative cells while meiosis involves the division of sex cells. Both divisions start with diploid parental cells but while the daughter cells in mitosis are also diploid, those of meiosis are haploid. This is why mitosis is referred to as equational division while meiosis is known as reductional division.

A cell that will undergo mitosis or meiosis would first have its genetic materials duplicated during interphase in addition to the synthesis of other important biochemicals such as proteins. Mitosis involves just a single division of the sister chromatids with two genetically identical daughter cells who are also clones of the parent cells resulting.

Meiosis, on the other hand, involves two divisions - the first one happens to separate homologous chromosome pairs while the second division separates sister chromatids just like in mitosis. During the early stage of meiosis, homologous chromosomes synapsed through the formation of a synaptonemal complex to form tetrads. Thereafter, synapsed chromosomes exchange chromosomal segments at a point known as chiasmata. All these happen at the prophase stage of meiosis I. The paired homologous chromosomes are then lined up at metaphase where they are engaged by the spindle fibers.

Meiosis II and mitosis are more or less the same with the chromosomes condensing at the prophase and the formation of metaphase plates at the metaphase. Sister chromatids are pulled apart and they migrate to the opposite poles at the anaphase and telophase.

8 0

3 years ago

Where is most of the co2 that has outgassed from earthâ€™s volcanoes?

NARA [144]

Answer:

Locked up in rocks .

Explanation:

The volcano consists of the high melted lava that are present in the rupture of the earth's crust. The disturbances and movement in the tectonic plates might cause volcano eruption.

The volcanic eruption releases large amount of carbon dioxide, ash and harmful chemicals. The carbon dioxide that are erupted is locked in the rocks that are present on the earth's surface. The carbon dioxide is stored in the form of carbonates in the rock.

Thus, the answer is locked up in rocks .

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4 years ago

What signals that a pine tree is capable of reproduction?

Sergio [31]

Answer:

Explanation:

6 0

3 years ago

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The major source of oxygen in earth's early proterozoic atmosphere is inferred to have been produced by

Misha Larkins [42]

In this question in which is the major source then of free oxygen in the earth's Proterozoic atmosphere is being produce by the evaporation of the ocean water. Hope this answer would be of big help to this assignment then.

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4 years ago

Imagine you are following a particular tRNA, called tRNAQ, through the process of translation in a eukaryote. In what order does

Alexxx [7]

Answer:

2. tRNAQ binds the A site of the ribosome.

1. The polypeptide is transferred to tRNAQ.

4. The ribosome shifts, with tRNAQ still bound.

3. tRNAQ binds the P site of the ribosome.

4. The ribosome shifts, with tRNAQ still bound.

5. tRNAQ binds the E site of the ribosome.

Explanation:

tRNAQ first lands on the A site of the ribosome. It carries an amino acid according to the exposed codon on A site. A bond is formed between the amino acid of A and P site such that the polypeptide is transferred to tRNAQ. The ribosome shifts now and tRNA Q moves to P site from A site while still bound to mRNA. Another tRNA enters the A site and the above process is repeated which finally transfers the polypeptide chain from tRNAQ to new tRNA. tRNAQ has no attached polypeptide now and is ready to leave the translation complex. The ribosome shifts again with the tRNAQ still bound to mRNA. tRNAQ enters the E site from P site and finally leaves the translation complex by exiting the E site.

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3 years ago