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Nostrana [21]
3 years ago
14

True or false the barfoed's test and the benedict's test indicate similar

Biology
1 answer:
Sphinxa [80]3 years ago
5 0
Im 99.9% its not false so the only other option would be true

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Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of
Zarrin [17]

Answer :Erwin Chargaff   a Biochemist

Explanation:

He formulated the base paring of double helix of DNA. He reasoned that since the percentage of four  DNA  bases are of this proportions in human;

                                  Adenine=30.9% and Thymine =29.4%;

                                  Guanine=19.9% and Cytosine =19.8%

Then,  the amount of adenine will always be equal to thymine,

And the amount of Guanine equals to cytosine based on this percentages of distribution.  

(Adenine and Guanine are large, molecule of Purines, while thymine and Cytosine are Pyrimidine)  

 

He concluded (although scientist believed, he did not explicitly stated this) that this should be the base paring patterns in DNA molecule. This is the first Chargaff Rule.

His second rule is that the DNA composition, in the relative amount of the four bases Adenine, Thymine, Cytosine and Guanine varies in proportion from one organisms to another. And this is the basis of molecular diversity.

6 0
3 years ago
a man is twice as old as his son.Five years ago the ratio of their ages was 9:4.Find the sum of their ages​
elena-s [515]

Answer:

75years

Explanation:

Let the Father's age be represented by 2x

Let the Son's age be represented by x

Five years ago;

Man's age will be = 2x - 5

Son's age will be = x - 5

If the ratio of their ages five years ago was 9:4, then;

2x - 5/x-5 = 9/4

4(2x - 5) = 9(x - 5)

8x - 20 = 9x - 45

- Collect like terms

-20 + 45 = 9x - 8x

25 = x

Hence, the son's age = 25 years

If x = 25, the father's age (2x) will be 2 × 25 = 50years

The sum of their ages will be = 25years + 50years = 75years

6 0
3 years ago
Which of the following best describes a shield volcano
weeeeeb [17]
B. a volcano that erupts in blasts of the pyroclastic matter. D. would be wrong because the shield volcano can have explosive eruptions but they are generally quiet 
5 0
2 years ago
Read 2 more answers
In a food chain, energy moves from producer to herbivore or
suter [353]

Answer:

To other consumers.

4 0
3 years ago
During prenatal development, hormones influence the brain the MOST during _____ month of development.
Rudik [331]

Answer:

Fourth and Fifth month

Explanation:

The fourth and fifth months formed the major part of the second trimester, and it is characterized by the growth of the brain and central nervous system which shows more alertness and developed faster in a way that appears similar to that of a new baby.

Also, this fourth and fifth month is characterized by growth in other parts of the unborn baby such as an increase in heartbeat, fingernails, hair, eyelashes, and toenails.

7 0
3 years ago
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