MYTUTOR SUBJECT ANSWERS

411 views

In DNA, if you know the percentage of a base on 1 strand, how do you work out the bases on the opposite strand?

This questions requires knowledge of the base pairing in DNA, plus a little bit of maths! As you know, bases on the 2 DNA strands always pair in the same way: A (adenine) with T (thymine) , C (cytosine) with G (guanine). I will use an example to explain.

Say you are told that strand 1 is 30% A, 25% C and 35% T. A always pairs with T, and so there will be the same amount of T on strand 2 as there A on strand 1 i.e. 30%.

25% C on strand 1 means there is 25% G on strand 2, as these bases always pair together. Strand 1 is 35% T and so strand 2 must be 35% A.

Finally, on strand 1, the total percentages must equal 100 and so this leaves 10% to be G. 10% G on strand 1 means 10% C on strand 2.

Eleanor B. A Level Biology tutor, GCSE Biology tutor, GCSE Chemistry ...

10 months ago

Answered by Eleanor, an A Level Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

165 SUBJECT SPECIALISTS

£20 /hr

Karishma D.

Degree: Medicine (Bachelors) - Imperial College London University

Subjects offered:Biology, Maths+ 3 more

Biology
Maths
Chemistry
-Personal Statements-
-Medical School Preparation-

“Hi guys, I'm a first year medical student at Imperial College London. I chose this degree because it indulges my passion for science whilst allowing me to interact with people, putting what I learn in the lecture theatre into practise...”

£20 /hr

Medi S.

Degree: Pharmacology (Bachelors) - Bristol University

Subjects offered:Biology, Maths

Biology
Maths

“Tutor for Biology Chemistry and Maths. I take an interactive approach and encourage discussion and questions about the content. ”

MyTutor guarantee

£20 /hr

Kelsey M.

Degree: Microbiology (Bachelors) - Queen's, Belfast University

Subjects offered:Biology, Science+ 1 more

Biology
Science
Maths

“About Me: My name is Kelsey and I am currently in my final year of a Bachelors degree in Microbiology at Queen's University Belfast. I'm really excited by microorganisms - the good, the bad and the ugly. About Tutoring: The content of ...”

MyTutor guarantee

About the author

Eleanor B.

Currently unavailable: for regular students

Degree: Medicine (Other) - Birmingham University

Subjects offered:Biology, Science+ 4 more

Biology
Science
Maths
Human Biology
Chemistry
.UKCAT.

“Hi! My name is Ellie and I am in my final year studying medicine at Birmingham University. I also have a degree in Biology and want to share with you my passion and enthusiasm for thesciences!How do my sessions work?That's the bes...”

You may also like...

Posts by Eleanor

Are diffusion and osmosis the same thing?

I am worried about the quantitative reasoning section of the UKCAT as it doesn't look like A-Level maths! How can I best prepare?

In DNA, if you know the percentage of a base on 1 strand, how do you work out the bases on the opposite strand?

Other A Level Biology questions

What is homeostasis?

Describe what each point of an ECG represents.

Describe the roll of kupffer cells in the liver

How is an electrical impulse transmitted through the heart?

View A Level Biology tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok