Which statement best describes cancer cells? They grow as a single layer of cells. They cease to reproduce after 20–50 mitotic divisions. They reproduce only when needed to replace missing cells. They are not regulated by contact inhibition.

Answers

Answer 1

Answer:

The statement which best describes cancer cells is that: D. They are not regulated by contact inhibition.

Cancer can be defined as the uncontrolled division of certain bodycells, which then invade the surrounding tissues of the body and interfere with the body's normal function.

Basically, cancer cells are caused when various body cells grow and divide more than they are required or they fail to when necessary (required).

Generally, some examples of cancer are:

Prostrate cancer.

Carcinoma.

Breast cancer.

The growth and division of body cells is controlled by cyclin-dependent protein kinases (Cdks) and regulated by subunits called cyclins during contact inhibition.

In conclusion, cancer cells are caused when body cells are not regulated by contact inhibition, which may be due to exposure to extremely dangerous radioactive substances such as gamma ray, uranium etc.

Answer 2

Answer: They are Not regulated by contact inhibition. The other 3 options are not characteristics of a cancer cell. Cancer cells have unlimited cell division, no anchorage dependent inhibition, no contact inhibition, and forms tumors - hence they don't form a single layer of cells

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Please explain how an increase in water vapour might result in a positive feedback loop

Answers

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1) What types of people were at the top of the pyramid in the south? Who was inthe middle? Who was at the bottom?

Answers

The pharaoh was basically at the top of the pyramid and servants/slaves are bottom

How does radiometric dating help scientists pinpoint the age of a fossil? A. In radiometric dating, scientists mix the carbon in a fossil with carbon from similar fossils whose age they know. By comparing the carbon, they can tell the exact age of the fossil.
B. Radiometric dating allows scientists to find fossils in only the lowest and oldest layers of sediment.
C. In radiometric dating, scientists place samples of a fossil in certain liquids until the samples dissolve. The rate at which they dissolve indicates the age of the fossil.

Answers

Answer:

C. In radiometric dating, scientists place samples of a fossil in certain liquids until the samples dissolve. The rate at which they dissolve indicates the age of the fossil.

Explanation:

The radiometric dating is the technique that is used to date the rocks carbon contents and traces out their impurities.

When the fossils were formed and is compared with the abundance of the naturally occurring radioactive isotopes and is made of the chemical elements and fossils are kept in this solution to find their relative and absolute ages.

C. In radiometric dating, scientists place samples of a fossil in certain liquids until the samples dissolve. The rate at which they dissolve indicates the age of the fossil.

What type of protein plays an important role in transmitting signals and to the nervous system

Answers

ion channel membrane proteins
I hope this helps;)

How often does the body perform cellular respiration?A.once in the morning and once at night
B.only at night
C.continuously
D.only when the body runs out of ATP

Answers

Ans. (C).continuously.

Cellular respiration can be defined as a metabolic process, which involves breakdown of carbohydrate molecules to produce energy in the form of ATP molecules. These ATP molecules release energy during chemical hydrolysis.

Cells present in body require a continuous supply of energy to preform all of metabolic reactions. Hence, cells perform cellular respiration continuously or constantly.

Thus, the correct answer is option (C).

c. constantly.

hope this helps!

Horses have a gene for coat color. The dominant allele gives a brown coat while the recessive allele gives a white coat. A breeder is crossing a purebred brown horse with a hybrid brown horse. What are the possible phenotypes of the offspring?

Answers

Answer:

they will all be brown horses but only two will have both dominant alleles, the other two will each have one recessive

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