Multiple Choice
Which proteins form ionic interactions with the negatively charged phosphates of the DNA backbone?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many hydrogen bonds are formed between guanine and cytosine in a DNA double helix?
A
Four
B
One
C
Two
D
Three
Verified step by step guidance1
Recall that in DNA base pairing, guanine (G) pairs specifically with cytosine (C) through hydrogen bonds.
Understand that the number of hydrogen bonds between base pairs contributes to the stability of the DNA double helix.
Remember the specific hydrogen bonding pattern: adenine (A) pairs with thymine (T) via two hydrogen bonds, while guanine (G) pairs with cytosine (C) via three hydrogen bonds.
Identify that guanine and cytosine form three hydrogen bonds between them, which is more than the two hydrogen bonds formed between adenine and thymine.
Conclude that the number of hydrogen bonds between guanine and cytosine in a DNA double helix is three.
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