LABORATORY REVIEW
MOLECULAR BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The bonds in the DNA are all different.
|
|
|
There are different orders of nitrogenous bases.
|
|
|
The phosphates in the DNA are different.
|
|
|
There are different kinds of sugars in the nucleotides.
|
Detailed explanation-1: -Although each organism’s DNA is unique, all DNA is composed of the same nitrogen-based molecules. So how does DNA differ from organism to organism? It is simply the order in which these smaller molecules are arranged that differs among individuals.
Detailed explanation-2: -99.6. The DNA of any two people on Earth is 99.6 percent identical. But 0.4 percent variation represents about 12 million base pairs, which can explain many of the differences between individuals, especially if the changes lie in key genes. Our environment also contributes to our individuality.
Detailed explanation-3: -Why is every human genome different? Every human genome is different because of mutations-"mistakes” that occur occasionally in a DNA sequence. When a cell divides in two, it makes a copy of its genome, then parcels out one copy to each of the two new cells.
Detailed explanation-4: -Two nitrogen-containing bases (or nucleotides) that pair together to form the structure of DNA. The four bases in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). These bases form specific pairs (A with T, and G with C).
Detailed explanation-5: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .