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Katarina [22]
3 years ago
7

How old dose boy’s hit puberty

Biology
2 answers:
I am Lyosha [343]3 years ago
5 0

Around the ages 9-14. On average, 12 is the average age.

Mazyrski [523]3 years ago
5 0

ages 9-14................

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Comment on why do you think cells prefer to use carbohydrates as a source of energy before they use fats and proteins.
kompoz [17]

Answer:

This can be explained  based on structure, and on metabolisms of  carbohydrate.

Explanation:

Carbohydrate has a relatively simple structural composition than the  either protein or fatty acids. The C, H and Oxygen molecules are of  relatively fewer in number and few  chains than fats and protein.Thus  cells will spend less energy to break bonds(catabolisims) among these molecules during cellular respiration  pathways  to trap the energy.

In addition glucose the end products of carbohydrate did not need any processing before it enters glycolysis, Kreb's Cycle and oxidative phosphorylation pathways to generate energy for the cells.

Conversely, for protein to be used it has to be first deaminated(removal of amino acid) by the liver  before it enters glycolysis,while fats needs to  be broken down and undergo beta oxidation   with the long chains removed  before it can  form acetyl CoA. Therefore cells will prefer few steps, less endergonic  pathways of glucose than longer more endergonic amino acids  and fatty acid pathways.

Furthermore, glucose can be used in cellular respiration to  produce energy either aerobically or anaerobically, while fats can only be used anaerobically. Therefore, since cells usually prefer to thrive in aerobic conditions they  breakdown glucose easily during this period, and when lack of oxygen occurs they switched to anaerobic, Thus, the versatility of glucose to oxygen concentration makes glucose a better choice. Besides if fats was used anaerobically, ketone bodies build up which may be toxic to the cells.

4 0
3 years ago
Phagocytes are unable to adhere to bacteria that have external capsules concealing their membrane carbohydrates. Our immune syst
ludmilkaskok [199]

Answer:

The correct answer is c) opsonins

Explanation:

Opsonization is a process in which proteins like antibodies and complement proteins called opsonins bind to the antigens and get it recognized by the phagocyted which destroys the antigen.

Especially when bacteria is having external capsule than it becomes difficult for phagocytes to attach to the capsular surface as the recognition molecule like membrane carbohydrate of antigen is concealed by capsule.

So to encounter this, antibodies like IgG and complement proteins like C3b attaches to the antigen and get it recognized and opsonized by the phagocytes like macrophages. This opsonization causes the destruction of antigen by enzymatic lysis.

8 0
3 years ago
Facilitated diffusion allows certain kinds of compounds that are normally blocked by the cell
Viefleur [7K]

Answer:

Potassium

Explanation:

All of the options are compounds, except for potassium which is an element

8 0
3 years ago
Help please? I don't understand
slavikrds [6]
I believe its A because a bonds with t g bonds with c and c bonds with g, translated to rna it's UCG.
3 0
3 years ago
If a person develops high blood pressure, one of the compensatory mechanisms that comes into play is the fluid shift mechanism.
ra1l [238]

Answer:  shift

Explanation:

4 0
3 years ago
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