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Which shows A correct pair DNA molecule?
A DNA molecule consists of 4 base pairs. They are adenine, guanine, cytosine and thymine—adenosine pairs with thymine using two hydrogen bonds. Thus, the correct base pairing is Adenine-Thymine: option (a).
What bases are found in a DNA molecule apex?
These bases are adenine, guanine, cytosine, and thymine. You’ll often see them referred to by only the first letter in their names: A, G, C, and T. Adenine and guanine are each a purine, a double-ring nitrogenous base.
3-10 AP19 Matching DNA profiles
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What nucleotides are found in DNA?
DNA is made up of four building blocks called nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C). The nucleotides attach to each other (A with T, and G with C) to form chemical bonds called base pairs, which connect the two DNA strands.
How many types of nucleotides are in DNA?
Because there are four naturally occurring nitrogenous bases, there are four different types of DNA nucleotides: adenine (A), thymine (T), guanine (G), and cytosine (C).
Which of the following nitrogenous bases is paired correctly apex?
Answer and Explanation: The correct pairing for nitrogenous bases is (c.) adenine-thymine; guanine-cytosine in DNA and (a.) adenine-uracil; guanine-cytosine in RNA.
Which molecule is active first during DNA replication apex?
Primers are active first. Primer synthesis is the first part of DNA replication. They are nucleotides created by an RNA enzyme called primase.
How are the paired bases of a DNA molecule best described?
A base pair is two chemical bases bonded to one another forming a “rung of the DNA ladder.” The DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups.
What base pairs are found in DNA RNA?
DNA and RNA bases are also held together by chemical bonds and have specific base pairing rules. In DNA/RNA base pairing, adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G). The conversion of DNA to mRNA occurs when an RNA polymerase makes a complementary mRNA copy of a DNA “template” sequence.
How do you find base pairs in DNA?
- A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T)
- C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G)
ADS1: DNA: the molecule, the string
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Which of the following correctly identifies the proper nitrogen base pairing in DNA replication?
Answer. Explanation: The nitrogenous bases form hydrogen bonds between opposing DNA strands to form the rungs of the “twisted ladder” or double helix of DNA or a biological catalyst that is found in the nucleotides. Adenine is always paired with thymine, and guanine is always paired with cytosine.
How nucleotides are joined together?
Nucleotides are joined together by covalent bonds between the phosphate group of one nucleotide and the third carbon atom of the pentose sugar in the next nucleotide. This produces an alternating backbone of sugar – phosphate – sugar – phosphate all along the polynucleotide chain.
What does adenine pair with?
In base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine.
What is complementary base pairing?
”’complementary base pairing. The standard arrangement of bases in nucleotides in relation to their opposite pairing, such as thymine being paired with adenine and cytosine paired with guanine.
What molecules combine to form A nucleotide?
A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T).
Why complementarity between base pairs in a DNA strand is possible?
Two complementary strands of DNA come together thanks to hydrogen bonding between the nitrogenous bases that allows DNA to make a ladder-like form that twists into the famous double-helix. It’s bonding between the nitrogenous bases that allows for this structure to form.
Which pair of nitrogen bases are correctly matched?
In DNA, the nitrogenous bases form purine–pyrimidine pairs by establishing hydrogen bonds, two between adenine and thymine and three between cytosine and guanine. Only option (D) proposes a correct pairing of nitrogenous bases. The nitrogenous base that is correctly paired is guanine forming a base pair with cytosine.
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Which correctly shows complementary base pairing of nitrogenous bases?
Correct answer:
Guanine and cytosine are bound together by three hydrogen bonds; whereas, adenine and thymine are bound together by two hydrogen bonds. This is known as complementary base pairing.
What are the 4 base pairs 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). Base pair may also refer to the actual number of base pairs, such as 8 base pairs, in a sequence of nucleotides.
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