Write in your own words | 50 points | will mark brainliest

Biology

1 answer:

Irina18 [472]3 years ago

7 0

Answer:

Undifferentiated cells which can be converted in any cell type as per need of the body. They originate form embryos and body tissues; like stem cells derived form skin, bone marrow, blood etc. stem cells controversy discusses the ethical boundaries in using stem cells or human embryos. retrieving embryos from the maternal body and using them for stem cell genesis is considered unethical according to most school of thoughts. But, nowadays scientists are shifting towards pluripotent stem cells. using stem cells in research can be very useful as nowadays many therapies include stem cells, like bone marrow transplant. moreover, using embryonic stem cells we can understand how an embryo develops, crossing various stages like fetus, and developing into an organism.

Explanation:

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A cell preparing to undergo meiosis duplicates its chromosomes during

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Answer:

Inter-phase

Explanation:

The cell grows and make a copy of its DNA during the interphase

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3 years ago

A) Compare and contrast diffusion, passive transport (diffusion & facilitated), primary active transport and secondary activ

zheka24 [161]

Answer:

Passive transport: It does not need any energy to occur. Happens in favor of an electrochemical gradient. Simple diffusion and facilitated diffusion are kinds of passive transport.

Simple diffusion: molecules freely moves through the membrane.

Facilitated diffusion: molecules are carried through the membrane by channel proteins or carrier proteins.

Active transport needs energy, which can be taken from the ATP molecule (Primary active transport) or from a membrane electrical potential (Secondary active transport).

Explanation:

Diffusion: This is a pathway for some small polar hydrophilic molecules that can freely move through the membrane. Membrane´s permeability depends on the size of the molecule, the bigger the molecule is, the less capacity to cross the membrane it has. Diffusion is a very slow process and to be efficient requires short distances and pronounced concentration gradients. An example of diffusion is osmosis where water is the transported molecule.

Facilitated diffusion: Refers to the transport of hydrophilic molecules that are not able to freely cross the membrane. Channel protein and many carrier proteins are in charge of this passive transport. If uncharged molecules need to be carried this process depends on concentration gradients and molecules are transported from a higher concentration side to a lower concentration side. If ions need to be transported this process depends on an electrochemical gradient. The glucose is an example of a hydrophilic protein that gets into the cell by facilitated diffusion.

Simple diffusion and facilitated diffusion are passive transport processes because the cell does not need any energy to make it happen.

Active transport occurs against the electrochemical gradient, so it does need energy to happen. Molecules go from a high concentration side to a lower concentration side. This process is always in charge of carrier proteins. In primary active transport the energy needed comes from the ATP molecule. An example of primary active transport is the Na-K bomb. In secondary active transport, the energy comes from the membrane electric potential. Examples of secondary active transport are the carriage of Na, K, Mg metallic ions.

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3 years ago

How do C4 plants fix carbons?

OverLord2011 [107]

Answer:

C4 plants—including maize, sugarcane, and sorghum—avoid photorespiration by using another enzyme called PEP during the first step of carbon fixation. ... PEP fixes carbon dioxide into a four-carbon molecule, called malate, that is transported to the deeper bundle sheath cells that contain Rubisco.

Explanation:

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3 years ago

What would happen if earth had no atmosphere??

Hitman42 [59]

There would be no life

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3 years ago

Read 2 more answers

You are giving ventilations to a 5-year-old child through a resuscitation mask, you should give 1 ventilation about every

Yuki888 [10]

You should typically give ventilation’s to a young child every 30 seconds.

Hope I could help! :)

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3 years ago