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Ket [755]
4 years ago
5

Describe the structure of a phospholipid

Biology
2 answers:
Ivanshal [37]4 years ago
7 0
Phospholipids are a class of lipids that are a major component of all cell membranes. They can form lipid bilayers because of their amphiphilic characteristic.////////

VashaNatasha [74]4 years ago
4 0

The phospholipids are composed of an alcohol group, generally glycerol or sphingosine, to which two long chain fatty acids and a phosphate group are attached. The phosphate group is at one end and forms a structure known as a "polar head," and is the hydrophilic part of the molecule, while long chain fatty acids form what is known as "apolar tail" or hydrophobic tail. Phospholipids in an aqueous medium form miscelas, structures where the phosphate group's polar heads are in contact with the aqueous medium, while hydrophobic tails are oriented inwards (something similar to oil drops in water). In the cells, both the internal medium (cytoplasm) and the external medium are aqueous media, therefore phospholipids, which are the major component of cell membranes, are oriented forming lipid bilayers. The polar heads are oriented towards the inner cell in the inner layer, and to the cellular bacteria in the outer layer. The hydrophobic tails are oriented towards the inside of the bilayer.

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Glucocorticoids increase bone ________; high levels of serotonin lead to _____ bone density.
dezoksy [38]

The glucocortocoids has the ability of increasing the bone loss while having a composition of serotonin in high levels will likely have the bone density to be at its low level. To complete the sentence; Glucocorticoids increase bone loss; high levels of serotonin lead to low bone density.

7 0
3 years ago
Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles. Howe
krok68 [10]

Part 1.

The correct answer is option 2.There are two alleles for freckles.

According to the condition of the occurrence of the freckles, it can be concluded that the freckle is an autosomal dominant condition. The freckle can only be inherited, if there is at least one dominant allele in any of the parent. If both the individuals are heterozygous for the trait, they can produce an offspring without freckle by passing down the recessive alleles to the progeny. So, the freckles are controlled by two alleles, which can be either dominant or recessive.

Part 2.

The correct answer is option 4. P generation and F2 generation.

In this case, it is given that true bred homozygous recessive plant is crossed with true bred homozygous dominant plant. The true bred recessive plant always shows the recessive phenotype. When  true bred homozygous recessive plant is crossed with true bred homozygous dominant plant, the F1 generation would produce all the heterozygous individual and exhibit dominant phenotype. When the F1 generation is self crossed, it result in 75% dominant phenotype and 25% recessive phenotype.

A possible cross for this case is given in the picture.

8 0
3 years ago
Read 2 more answers
If a lipid bilayer is at least 108 times less permeable to K ions than it is to water, how do the K ions that are needed for man
valina [46]

Answer:

Explanation:

If the lipid bilayer is at least 108 times less permeable to K ions than it is to water, then a way that this much needed ions can get into the cell is through ion channels.

Ion channels are memberane proteins that form pores and they also span across the cell membrane allowing ions to pass through these pores. They act as a passage through which charged ions can pass through. There are three main type: voltage-gated, extracellular ligand-gated, and intracellular ligand-gated ion channels.

4 0
4 years ago
A red blood cell will undergo crenation in _____
miss Akunina [59]
A red blood cell<span> placed in a hypertonic solution </span>will<span> shrink in a process called</span>crenation<span>. </span>A red blood cell<span> placed in a hypotonic solution </span>will<span> swell and potentially burst in a process called hemolysis. ... Indicate whether </span>crenation<span>, hemolysis, or neither </span>will<span> occur.</span>

5 0
4 years ago
Help me on problem 13 plz
rusak2 [61]
25 ft
The triangles are proportional. There is the small triangle (5 ft, 6 ft, hypotenuse). There is the larger triangle that includes the small triangle (30 ft, height).

That means the side lengths are proportional.

5h=630+6→ The side lengths of the small triangle over the side lengths of the large triangle, with h representing the unknown height.

Now, let's solve the proportion:

5h=630→ Simplify the second fraction

5h=15→ Cross multiply (multiply the h by 1, the 5 by 6) and set the products equal to each other

h=5⋅5

h=25→ This is the height

4 0
4 years ago
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