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3 years ago

Approximately how many doublings can normal human fibroblasts undergo in culture?

Biology

2 answers:

MrRissso [65]3 years ago

8 0

50 to 100.

After 50 to 100 doublings, the cells will stop growing and die. The original cell was thought to have arisen from the enclosure of self-replicating by a phospholipid membrane..

const2013 [10]3 years ago

7 0

For this I would say 50 to 100. After 50 to 100 doubling, the cells will stop growing and die

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One idea to mitigate the effects of burning fossil fuels on atmospheric CO2 concentrations is to pipe liquid CO2 into the ocean

Cloud [144]

Answer:

Option E, Both increased acidity of deep waters and changes in the growth of bottom-dwelling organisms with calcium-carbonate shells

Explanation:

When high concentration of CO2 is pumped into the ocean at its greater depths, CO2 is absorbed extensively by the ocean which changes the pH of ocean water and makes it more acidic. The high acidity of ocean water is due to the release of free hydrogen ions. Excess of hydrogen ions make the carbonate ions less abundant due to which the organism that make carbonate shell will suffer as they may not get sufficient carbonate ions to calcify their outer coverings.

Hence, option E is correct

4 0

3 years ago

A pair of fruit flies reproduces and has 1000 offspring. All 1000 offspring have the alleles Gg. What is the most likely combina

AleksAgata [21]

Answer:

The correct answer would be - GG and gg.

Explanation:

As it is given that all the 1000 offspring having the same allele Gg which is only possible in one condition that is cross between GG and gg because it is a heterozygous condition in the offspring. So there must be both allele present and it can not be heterozygous parents as there would be a different combinations of offspring in that case.

If the parents either GG only all the offspring would be GG the same with gg than all the offspring will be gg, thus the correct answer would be GG and gg.

7 0

3 years ago

Cystic fibrosis is a genetic disease in humans in which the CFTR protein, which functions as a chloride ion channel, is missing

KiRa [710]

Answer:

ABC transporter protein

Explanation:

ABC transporter protein refers to the ATP binding cassette protein which utilizes the AT energy to transport the substrates from one side to another side. The ABC proteins are one of the oldest proteins known in the organisms.

The CFTR protein which acts as a chloride channel in the membrane which transports the chloride ions across the membrane utilizes the ATP energy in the transport.

Thus, ABC transporter protein is correct

4 0

3 years ago

20. The five recognized periods of mass extinction have- *

Naddik [55]

Answer:

1. Ordovician Mass Extinction (about 44o million years ago)

2. Devonian Mass Extinction (about 375 million years ago)

3. Permian Mass Extinction (about 250 million years ago)

4. Triassic-Jurassic Mass Extinction (about 200 million years ago)

5. Cretaceous-Tertiary Mass Extinction (about 65 million years ago)

Explanation:

7 0

3 years ago

This is a system of organisms or things ranked one above another

Bumek [7]

This is a system of organisms or things ranked one above another

Answer:

Genus

Explanation:

the usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species.

Hope this Helps

--Jay

5 0

3 years ago