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MArishka [77]
3 years ago
7

which of the following explains why normal cells grown in a petri dish tend to stop growing once they covered the bottom of the

dish? A.) the petri dish speed up cell growth B.) contact with other cells stops cell growth C.) the cells lack cyclin D.) most cells grown in petri dishes have a defective p53....but it says B is wrong
Biology
2 answers:
UNO [17]3 years ago
7 0

Answer: Option B

Explanation:

The normal cells when grown in a nutrient medium starts growing in into the petri dish. The cells keep on growing and when the bottom layer of the plate is filled with the cells then the cells in the petri dish stops growing. This is because the cells observes the contact of one cell with another.

This is known as contact inhibition which does not allows the growth of one cell upon another. Contact inhibition is a part of cell signaling in which there are check points that allows the optimum growth of the cells.

This is a mechanism which helps the cells in optimum growth. This helps in preventing the cell from developing tumor by dividing uninterruptedly.

juin [17]3 years ago
6 0
Sorry if this is wrong but the answer should be D
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If adh secretion is inhibited which of the following will initially result
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Answer:

A.

Explanation:

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7 0
2 years ago
What is responsible for the red tide phenomenon? It is a phenomenon that usually coincides with storm surges; the name comes fro
tatuchka [14]

Answer:

Red tide occurs in patches of water where certain species of dinoflagellates flourish.

Explanation:  

Red tides refer to the noticeable microalgae proliferation that can be recognized for being a big spot in the sea of a characteristic coloration. This phenomenon is caused by two microalgae groups: diatoms and dinoflagellates, both part of phytoplankton.

Red tides occur when certain environmental factors -such as temperature, light, nutrients availability, ph, etcetera- favor the overproduction of these organisms. These species produce toxins that turn to be dangerous for other animal species that feed on them.

Because these microorganisms produce pigments, their accumulation on the sea surface can be noticed as reddish, brown, or greenish color spots of variable extension.

4 0
2 years ago
What action is directly responsible for the generation of an action potential at the sarcolemma?
Over [174]

Answer:

Nervous stimulus action for muscle contraction

Explanation:

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7 0
3 years ago
Complete each statement.
beks73 [17]

7. Adenine (A), Guanine, Cytosine and Thymine are the four nitrogenous bases in DNA.

8. In DNA Cytosine always forms hydrogen bonds with guanine.

9. The sequence of nucleotides carries the genetic information of an organism.

10. The process of replication produces a new copy of an organism's genetic information which is passed on to a new cell.

11. The double-coiled shape of DNA is called a double helix

Explanation:

There are four nitrogenous bases in the DNA of an organism. Two of the bases are pyrimidines eg: Thymine and cytosine while 2 of the bases are purine  bases namely adenine and guanine. The purine of one strand forms a hydrogen bond with pyrimidine of the parallel strand of DNA.

The bases are present in nucleoplasm as dNMPs and in DNA they are present as dNTPs (deoxyribonucleotide triphosphate). During replication, these dNMPS keeps on bonding with other dNMPs in the presence of ATP and as DNA Polymerase, ligase topoisomerase etc. These nucleotides form the DNA strands and they are responsible for coding proteins. The sequence of DNA is also termed as gene.

The double helix structure of DNA was given by Watson and Crick. Each strand has an alternative backbone of sugar and phosphate group. The four bases bonds with glycosidic and phosphodiester bonds with sugar and phosphoric acid.

8 0
3 years ago
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lesantik [10]

Answer:

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Explanation:

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3 years ago
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