The correct answer is 50.
Proteins are complex biomolecules made out of amino-acids bound together with peptide bonds. They can be comprised out of thousands of several polypeptide chains with thousands of amino-acids organised in complex structures. But, some of them can contain only around 50 amino-acid and still posses all of the complex traits of an protein.
Some polypeptides contain only 3 amino-acids, but technically they are not classified as proteins due to a big functional and structural differences between a simple polypeptide chain and a protein. Proteins are made out polypeptide chains, but this is only the primary structure of an protein. the polypeptide chains in a protein are organized into complex 3D structures that give them novel traits and complexity as compared to plain polypeptide chains.
Answer: 50
Explanation:-
Proteins are polymers which are very critical for the normal functioning of the human body. They are essential for the structure, function, and regulation of the body’s tissues and organs.
Proteins are made up of number of smaller units called amino acids that are attached to one another by peptide bonds and thus form a long chain of polymer called as protein.
A protein at least 40 amino amino joined together by peptide bond is known as protein.
Answer:
Diameter of capillaries is 30-40 µm in diameter while on the other hand, the diameter of aorta is 4 cm.
Explanation:
The diameter of capillaries is 30-40 µm in diameter while on the other hand, the diameter of aorta is 4 cm which is the main reason for higher flow speed of the blood in the aorta as well as more blood is transported in the aorta. If the total area of the capillaries considered together is equivalent to the cross-section area of a single vessel of aorta then the flow speed of both is similar due to similar area.
The total cross-sectional area of the capillaries considered together must be much larger than that of the aorta to allow for a slow and controlled exchange of substances between the blood and the cells. The blood velocity in the aorta is about 25 cm/s, while in the capillaries, it is about 1 mm/s. We can use the equation A = πr^2 to find the cross-sectional area of a single capillary with a velocity of 1 mm/s.
The total cross-sectional area of the capillaries considered together must be much larger than that of the aorta because the flow speed in the capillaries is much less than in the aorta. This allows for a slow and controlled exchange of substances between the blood and the cells in the capillaries. The blood velocity in the aorta is about 25 cm/s, while in the capillaries, it is about 1 mm/s. If we assume the capillaries have a cylindrical shape, we can use the equation A = πr^2 to find the cross-sectional area of a single capillary with a velocity of 1 mm/s.
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the food supply, said Claire Kremen, a conservation biologist at Princeton University in
New Jersey.…
The honeybee decline, which is affecting domesticated and wild bee populations
around the world, is mostly the result of diseases spread as a result of mites and other
parasites as well as the spraying of crops with pesticides, scientists say.…
Source: “Bee Declines May Spell End of Some Fruits, Vegetables,”
National Geographic News, October 5, 2005
The decrease in the honeybee population is partly due to
(1) the use of pesticides (3) the use of fertilizers
(2) a decrease in prey (4) a decrease in fruits and vegetables
I would also have to say: 1) the use of pesticides
I did a powerpoint presentation on the decrease of honeybees for biology in college. I cannot find the presentation I did however, I do remember some of the points I made.
Varroa Mites aka Varroa destructors (parasite) are also contributing to the honey bee population decreasing. They latch onto the honeybees and feed off of them. They also feed off of the larva's (baby version of a honeybee).
Another issue could be that GMOs. Plants DNAs have been altered so that they can fight disease and kill unwanted bugs.
Another issue is population ecology, which deals with density independent and dependent factors. Density-independent, deals with habitat destruction by natural disasters or humans. Dependent factors- overcrowding of an area.
Hopefully this helped and good luck.