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givi [52]
3 years ago
13

Which of these is used to find the precise age of a rock? Index fossils Radioactive dating Relative dating Stratified rock layer

s
Biology
1 answer:
horrorfan [7]3 years ago
7 0

Answer:

Option (2)

Explanation:

Rocks are the aggregates of minerals are are present on earth since a large geological time. The age of these rocks are usually determined with the help of a technique that is commonly known as the radioactive dating. It is one of the applicable method that is used to calculate the accurate age of a rock depending upon the amount of radioactive isotope that is present in it. There are various methods of dating such as Uranium-Lead dating, Potassium-Argon dating and Carbon dating. These methods are commonly used by the geologists.

Thus, the correct answer is option (2).

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Fill in the table below by writing the complementary strand of DNA that would be formed by each template strand
BlackZzzverrR [31]

Answer:

DNA strand = complementary strand

GCAAG = CGTTC

TTACG = AATGC

GATAC = CTATG

CGGAT = GCCTA

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CGATT = GCUAA

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GCATC = CGUAG

TTCAT = AAGUA

Explanation: A complementary strand is not the same in base composition and sequence with the template strand. In DNA, anywhere adenine is found in the template strand, thymine is found in the complementary strand and anywhere cytosine is found in the template strand, guanine is found in the complementary strand. But in RNA, anywhere adenine occurs in the DNA template strand, uracil occurs in the mRNA strand, wherever thymine occurs in the DNA template strand, adenine occurs in the mRNA strand and wherever guanine occurs in the DNA template strand, cytosine occurs in the mRNA strand.

Summarily, in DNA adenine pairs with thymine while cytosine pairs with guanine while in mRNA, adenine pairs with uracil, while cytosine pairs with guanine.

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