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3 years ago

How does the cell theory describe the levels of organization of living organisms ???

1 answer:

5 0

<span>It took over 200 years for the "cell theory" to be formalized and accepted. Hooke and Leeuwenhoek were early microscopist's.... but at the time the nature of matter, the belief in spontaneous generation, and the idea there were little worlds within little worlds ad infinitinum was popular. The discovery of the periodic table and establishment that atoms were real, the demolishing of spontaneous generation, all happened at the time that Schwann and Schleiden (and others) were working with better microscopes, better ideas about the material world, and better observations...... thus the cell theory.

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6. How do earthquake and volcano patterns support the idea of plate tectonics? (Multiple choice)

lukranit [14]

Answer:

The Answer is A

Explanation:

After looking at all the other options, A is the best option. Good luck on your test! :)

Hopefully I helped! :)

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3 years ago

The Rh factor identifies the presence of the rhesus protein in blood. The Rh factor can be represented by a + or – sign. It is i

vitfil [10]

Answer:

Blood type A

Explanation:

Blood type A Rh+

Antigens (on the surface of the red blood cells):

A indicates there are A antigens.

Rh+ indicates there are Rh antigens.

Antibodies (in the blood plasma):

B antibodies.

If there are A and Rh antigens but no B antigens, the antibodies in the blood plasma are B antibodies.

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3 years ago

Read 2 more answers

You have isolated a highly lethal toxin from an octopus that you have reason to believe binds with high affinity to the pore ope

Brilliant_brown [7]

Answer:

To determine the effect of toxin binding, you perform a Competitive Binding Experiment

Explanation:

Competitive binding experiments are very relevant when matters relating to cellular and or molecular toxicity are concerned.

They are used to determine the binding of a single concentration of labeled ligand in the presence of various concentrations of unlabeled ligand.

They are important because:

1. Validate a direct binding assay

2. Confirm whether or not a drug binds to the receptor

3. determine and explore how low-affinity drugs and receptors interact and it's resultant effects

Cheers

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3 years ago

Which macromolecule forms a double layer as the primary structure of cell membranes?

OlgaM077 [116]

Answer;
Phospholipid.

Phospholipid forms a double layer as the primary structure of cell membranes.

Explanation;
Cell membranes contains of lipids (phospholipids and cholesterol), proteins and carbohydrates groups that are attached to some of the lipids and proteins.
Phospholipids are composed of a polar head and non-polar (hydrophobic) tail. They line up such that the heads and the tail groups are side by side to form a single layer due to the interactions between the head groups and the tail groups. Two of these layers line up with the hydrophobic tail groups facing each other to prevent the hydrophobic groups away from the polar head groups of other phospholipids and from the water in the surrounding environment.

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3 years ago

Read 2 more answers

What an enzyme?<br> I'll give brainliest

Damm [24]

Answer:

Enzymes are proteins that act as biological catalysts. Catalysts accelerate chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products.

Explanation:

Hope this helps

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2 years ago