Q3 MODULE 4 DNA REPLICATION

Q3 MODULE 4 HEREDITY, INHERITANCE AND VARIATION

DNA AND ITS REPLICATION

Multiple Select

It carries the genetic information of an organism.

• DNA

• RNA

• PROTEIN

• NITROGEN

What did Oswald Avery discover about DNA?

• Avery and other scientists discovered that the nucleic acid DNA stores and transmits the genetic information from one generation of an organism to the next.

The Double Helix

• Rosalind Franklin was able to take X-Rays beams on DNA to find a distinct pattern

• James Watson and Francis Crick took these results and were able to build a structural model of DNA

• This model of DNA was a Double Helix,

  in which two strands were wound

  around each other

Multiple Select

What is the shape of DNA?

• a circle

• a triangle

• a square

• a double helix

DNA

A DNA is a double helix/double stranded molecule made up of subunits called nucleotides(the building blocks of DNA).  

DNA

Each nucleotide consist of three components:

A five-carbon sugar molecule which is deoxyribose, a phosphate group, and a nitrogenous base.

There are four nitrogenous bases that compose DNA nucleotides:

Cytosine (C), Guanine (G), Adenine (A), and Thymine (T).

DNA

Across the strands of the helix, A always pairs with T, and G with C.

Each base pair is held together by a weak hydrogen bond.

Multiple Choice

What is the matching nitrogen base sequence for the gene below?

A-

T-

C-

• T

  C

  G

• T

  A

  G

• G

  A

  T

Multiple Choice

If we think of DNA as a ladder, which parts are the steps of the ladder?

• the nitrogen base pairs

• phosphate group

• genes

Multiple Choice

What is the principal enzyme involved in DNA replication?

• DNA Polymerase

• glucose

• fructose

Multiple Choice

The enzyme that unwinds the DNA to prepare for replication

• helicase

• polymerase

• replicase

Multiple Choice

DNA replication results in two DNA molecules,

• each one with two original strands

• one with two new strands and the other with two original strands

• each one with one new strand and one original strand

Multiple Choice

A process in which DNA has the unique ability to make an exact copy of itself.

• Translation

• Replication

• Transcription

Multiple Choice

The process of DNA replication is called semi conservative because it results in

• two identical molecules, each with 1 original strand and one new.

• Two DNA molecules. One original molecule and one with two new strands

• two exact copies with new strands

Multiple Choice

When DNA makes a copy of itself, the new strands are identical or different?

• identical

• different

Open Ended

Each strand of the double helix serves as a __________ for a new strand.