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uranmaximum [27]
3 years ago
11

Which macromolecule makes up the main structure of the cell membrane?

Biology
1 answer:
tiny-mole [99]3 years ago
4 0

Answer:

Lipids

Explanation:

Cell membranes are composed of proteins and lipids. Since they are made up  of mostly lipids, only certain substances can move through. Phospholipids are the most abundant type of lipid found in the membrane.

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Why describes the basic structure of a fatty acid?
dalvyx [7]

A long carbon and hydrogen chain and a carboxyl group.

In images of fatty acids (the monomers of Lipids), it is depicted as a long carbon chain with hydrogen on the ends and connected to them as well, yet on the clear side is the carboxyl group.

Hope this helps!

4 0
3 years ago
Restriction enzymes: A) act at the membrane to restrict the passage of certain molecules into the cell. B) are highly specialize
Elenna [48]

Answer:

C) are sequence-specific DNA endonucleases

Explanation:

Restriction enzymes represent a type enzyme capable of recognizing short nucleotide sequences to cut at specific restriction sites in the DNA, these sites are known as target DNA sequences. Some of the most commonly used restriction enzymes are <em>EcoRI</em>, <em>BamHI</em> and <em>HindIII</em>, isolated from <em>Escherichia coli</em>, <em>Bacillus amyloliquefaciens</em> and <em>Haemophilus influenza</em>, respectively. Restriction enzymes are endonucleases because these enzymes only cleave the phosphodiester bond within the DNA chain, conversely to exonucleases, which cleave nucleotides from the end of the polynucleotide DNA strand.

3 0
3 years ago
In a cross between two mice that are heterozygous for agouti, black, color, and piebaldism, what is the probability that offspri
taurus [48]

Answer:

9/256

Explanation:

According to Mendel's experiments the results for the heterozygous are in the ratio 3:1

As  each gene is considered separately and the multiplication rule is used. Therefore the probability of getting a solid color would be 1/4 and black fur would be 3/4. Similarly the probability of getting the colored fur is 3/4 and getting a piebald( white patches) is 1/4

Then the combined probability is (1/4*3/4*1/4*3/4)= 9/256

5 0
3 years ago
Which of the following is characteristics of a steroid hormone action?
aleksklad [387]

Answer:

internal receptor binding

Explanation:

This is because steroid hormones are lipids by nature (usually composed of cholesterol) so they are hydrophobic. This means that steroid hormones can easy pass through the membrane and bind to their internal receptors.

Internal receptors also known as intracellular receptors have DNA binding domain and when hormones bind to them DNA-binding site becomes exposed. Hormone-receptor complex gets into the nucleus and binds to  regulatory regions of the DNA. Cellular response is gene expression.

3 0
3 years ago
Where are the proteins of the electron transport chain in aerobic respirations located?
Elena L [17]
<span>The proteins of the electron transport chain are located in the inner membrane of the mitochondria.
Electrons are passed from one protein of the transport chain to another in a series of redox reactions, making the proton gradient which is then used to make ATP.</span>
5 0
3 years ago
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