Answer:
The correct answer is b. He determined that DNA contains four nitrogenous bases.
Explanation:
Levene was an American biochemist who studied the structure of DNA in the early 1900s and in 1920 he found that DNA consists of four nitrogenous bases that are Adenine, Guanine, Thymine, Cytosine.
He also found deoxyribose sugar and phosphate group and said that nucleotide is the basic unit of DNA which contains a ribose sugar with attached nitrogenous base and phosphate group.
He also concludes that an equal amount of adenine, guanine, thymine, and cytosine makes the DNA which is now known as tetranucleotide hypothesis. So the correct answer is b. He determined that DNA contains four nitrogenous bases.
B. 313 kpa
C. 166 kpa
D. 277 kpa
As we know that
P total = pO +pH +pN
so
P = P1 + P2 + P3
378 kPa= 212 kPa + 101 kPa + P(H2)
P(H2) = 65 kPa
partial pressure is 65
so correct option is A
hope it helps
Answer:
The correct answer is option A.
Explanation:
Total pressure of mixture = p = 378 kPa
Partial pressure of the oxygen gas =
Partial pressure of the hydrogen gas =
Partial pressure of the nitrogen gas =
As we know that total pressure is sum of partial pressures exerted by all the individual gases.
65 kPa the partial pressure exerted by nitrogen.
B. f(x) = 4(x)3
C. f(x) = 6(3)x
D. f(x) = 6(x)3
Answer:
a is right
Explanation:
~subducts below the Eurasian Plate on the west side
~ the Arabian and Somali Plates form boundaries with it
What is the name of the tectonic plate described above?
A)
African Plate
B)
Eurasian Plate
C)
North American Plate
D)
Indo- Australian Plate
Answer:
Option (A)
Explanation:
The African plate is usually referred to as the fourth major (largest) tectonic plates that cover the continent of Africa and a portion of both the Atlantic and Indian ocean.
This plate shares a convergent plate boundary with the Eurasian plate towards its western side, where the African plate being denser subducts below the lighter Eurasian plate
It shares a boundary with the two smaller plates namely the Somalian and the Arabian plate towards its eastern side.
Thus, the correct answer is option (A).
Because energy is wasted as heat, there is less energy available as food for organisms at each level above so ecological pyramid is smaller at the top than the bottom.
To know more about Ecological pyramid here
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What do Vaccines do?
Answer: vaccines help to protect us from a disease by giving our immune system a sample so that when the real disease comes, your body will be ready to fight it off.
Explanation:
Hope that helps!