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jolli1 [7]
3 years ago
14

Which characteristics makes a cell membrane selectively preamble

Biology
2 answers:
Brrunno [24]3 years ago
8 0

Cells are selectively permeable due to the Phospolipid Bilayer. It allows only certain molecules to pass through. The cell membrane is made of two sheets of phosolipid bilayers

Ganezh [65]3 years ago
5 0

Did you mean permeable?

The hydrophobic center to a cell membrane (also known as a phospholipid bilayer) gives the membrane selective permeability.  If a substance is permeable , something such as water or gas can pass through it or soak.

Some solutes cross the membrane freely, some cross with assistance, and others do not cross at all.

Large molecules do not cross intact cell membranes, except in certain special cases.

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Aminolevulinate dehydratase (ALAD ) is an enzyme that relies on zinc as a coenzyme. A zinc ion binds to the ALAD active site, wh
slavikrds [6]

Answer:

The correct option is C. It changes the three-dimensional structure of the active site so that ALAD is no longer compatible with its substrate.

Explanation:

Co-factors are molecules that are required by an enzyme to perform its function of catalysis. If a wrong co-factor binds to the enzyme then it will change the three-dimensional structure of the enzyme and the substrate will no longer fit into the enzyme. Hence, Option C is the best choice that explains the inhibition of ALAD.

Other options are false because :

Option A: The wrong co factor will not affect the substrate nor will it make it compatible for ALAD's active site.

Option B:  The wrong factor doesn't change the amino acid sequence of the protein or enzyme, rather it changes the three dimensional structure of the enzyme.

Option D : The wrong co factor won't allow the reaction to proceed at a faster rate, rather it will inhibit the reaction.  

6 0
3 years ago
What kind of carbohydrate is a sugar? What kind is a starch?
ELEN [110]
The simplest form of carbohydrate is glucose. So, starch is a complex carb, while sugar is a simple carb.
6 0
3 years ago
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Why are data tables used in a controlled experiment?
amid [387]

Answer:

b to help organize data and record info.

3 0
3 years ago
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a three letter sequence of mrna that encordes for a specific amino acid is called a/an a series of these links specific amino ac
Verdich [7]

Answer: Codon

Explanation:

Codon refers to nucleotide triplets of mRNA that serve to specify the amino acid sequence of proteins. There are total 64 genetic code that specify 20 standard amino acids found in proteins. All codon together make genetic code. For example: AUG is codon that specify amino acid "methionine". AUG codon also serve as initiation codon during initiation of protein synthesis.

3 0
4 years ago
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In your own words, explain the difference between the pitch and intensity of sound.
lutik1710 [3]

Answer:

The pitch of a sound is how high or low a sound is when we hear it, whereas the intensity of a sound is the energy/vibrancy of the sound over an area and depends on the frequency of the sound as well.

6 0
2 years ago
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