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3 years ago

Explain what happens to animal cells if they are put in fresh water

1 answer:

6 0

They will actually explode or burst

So What happens is the pure water outside has a high water potential while the cytoplasm inside the animal cell is a low water potential, water will diffuse down a water potential gradient through the semi-permeable membrane of the animal cell and cause the cell to swell (inflate like a fully-blown balloon), the result is that the delicate, elastic cell membrane can't tolerate the internal pressure coming from the cytoplasm so it tears causing the cell to burst.

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Rabbits, turtles, fish, humans, and whales all share certain characteristics but also differ from each other. All of these speci

Delvig [45]

The levels of organisation are

Domain: Eukarya

Kingdom Animalia

Phylum :Chordata

Explanation:

They all share these levels of organisation because;

for the Domain Eukarya, they have;

→multi-cellular cells containing nucleus; and other membrane bound organelle.e.g Mitochondrial.

→their DNA located in the nucleus packaged as linear chromosomes bounded by histone proteins.

→mode of reproduction which is sexual.

They share Kingdom Animalia because;

→they have multi-cellular, specialised cells, bounded by plasma membranes.

→they have specialized tissues, organs, and system.

→they all undergo heterotrophic mode of nutrition as evident in the question 'that they must consume plants and animals as source of energy'

→they exchanged communication by nervous ssytem and 

→ use homeostatic mechanisms to regulate water balance of the body through the kidney.

→Humans,Rabbits,and whales are VIVIPAROUS; they give birth to young ones alive.

→Most fishes lay eggs to reproduce, they are said to be Ovoviviparous.

They belong to phylum Chordata because ;

→they all have noto chord; which serve as template for axial skeleton.

dorsal hollow nerve cord -template for the brain and spinal cord

→pharyngeal slits- templates for gill aches in bony fishes and components of inner ear in land animals.

→ tail length varies in these organisms.

8 0

3 years ago

When the quadriceps contact what also must happen at the same time?

Inessa [10]

Answer:

B. The hamstrings must relax.

Explanation:

When the quadriceps contact, the hamstrings must relax at the same time.

8 0

3 years ago

Where would you expect to find human populations with lighter pigmentations? ( I would really appreciate a explanation with it t

NARA [144]

Answer:

Human skin pigmentation is the product of two clines produced by natural selection ... The populations exhibiting maximally depigmented skin are those ... &c., are of the nature which it might have been expected would have been ... The evolution of light pigmentation at high latitudes has long been related ...

Explanation:

7 0

3 years ago

1. How is modeling useful to scientists?

saveliy_v [14]

A model can help scientist to study the things that are difficult to understand that can not be observed directly. It allows scientists to examine and visualize that might not be accessible physically. All the natural science is based on the models, these are suggested and tested by observations.

8 0

3 years ago

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N 9 Viruses use the host's machinery to make copies of themselves. However, some human viruses require a type of replication tha

Amanda [17]

Answer:

This is because the Viron has in its genome a specialized code for synthesising any missed enzyme for replication that is lacking in the host cell.

An example is the replication of the human DNA cells by the Immunodeficiency virus(HIV) . Human cells only have enzymes for copying DNA templates, and lacks the enzyme to convert the HIV RNA genome to human DNA.However these viruses have in its genome; code for synthesising its own RNA polymerase enzymes that copies or transcribed the human DNA to HIV RNA.

This ability of the viral cell to code for the host's enzyme has a therapeutic effect. Drugs can be targeted at the viral polymerase enzymes to reduce the replication and therefore toxicity in the host cells.

Explanation:

6 0

3 years ago