Micro lecture exam 2

Question 1

Properties of DNA

Answer 1

1.) DNA must contain biologically useful information (living) in a stable form
2.) DNA must be capable of reproduction=replication=growth/divide
3.) DNA must be decodable (template)- transcription/translation
4.) DNA must be able to change or show variation (mutation)(mutate/adapt)

Question 2

DNA is made from…?

Answer 2

Nucleotides= phosphate, pentose (5c sugar) and a (nitrogenous) base

Question 3

list the Nitrogenous bases–>

Answer 3

Adenine, Guanine, Cytosine, Thymine (attached to sugars)
- the bases form pairs in the center of the DNA

Question 4

center- hydrogen bonds hold the base pairs together

Answer 4

• the base pairs undergo complementary base pairing

1.) A&T pair with 2 hydrogen bonds A:::T
2.) G&C pair with 3 hydrogen bonds C::::G

Question 5

A hydrogen bond is a weak bond between…..

Answer 5

H…O or H…N
- easy to make and easy to break

Question 6

Why are hydrogen bonds important in the DNA structure ?

Answer 6

• because they are weak they can easily be broken
• when they’re broken we call it unzipped
• they can be reformed or zipped