Which of the following adapts the aorta to the high pressure of the blood pumped from the heart?
Thin walls
Fragile membrane
Thick elastic walls
stiff walls
Narrow lumen
Correct answer is C
No explanation has been provided for this answer.
experimental error in calculating the separate masses
change of momentum of each fragment
potential energy lost
nuclear energy released
kinetic energy lost
Correct answer is D
No explanation has been provided for this answer.
Testing for a reducing sugar, the food substance is usually warmed with
sulphuric acid
million's reagent
sudan III
Benedict's solution
Correct answer is D
No explanation has been provided for this answer.
An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years
1 N atoms8
1 N atoms3
2 N atoms3
5 N atoms6
7 N atoms8
Correct answer is E
\(\frac{N}{3}\) = 3years
\(\frac{N}{4}\) = 6years
\(\frac{N}{8}\) = 9years
N - \(\frac{N}{8}\) = \(\frac{7N}{8}\)
Pellagra can be prevented by consuming food rich in
vitamin A
vitamin B
Vitamin D
calcium
iodine
Correct answer is B
Pellagra is due to a lack of the vitamin niacin and/or its precursor tryptophan, an essential amino acid.
Food sources of niacin and/or tryptophan include nutritional yeast, eggs, bran, peanuts, meat, poultry, fish with red meat, cereals (especially fortified cereals), legumes, and seeds.
Niacin, also known as nicotinic acid, is an organic compound and a form of vitamin B₃, an essential human nutrient.