“on your feet…”

Chapter#8: Review Activity

Instructions

• One at a time, true-false statements will be read and shown on the screen.

• If you believe that the statement is true, please stand where you are.

• If you believe that the statement is false, please remain seated where you are.

• Then we’ll discuss!

Statement #1

•DNA (Deoxyribonucleic Acid) is a complex molecule found in all living organisms.

•True

Statement #2

•The DNA code is made up of five unique letters (nucleotides).

•False (4)

Statement #3• In the DNA language,

Adenine will always pair with Guanine and Cytosine will always pair with Thymine.

• False (A/T and G/C)

ADENINE THYMINE

GUANINE CYTOSINE

Statement #4

•DNA is found in every cell of every living organism.

•True

Statement #5

•DNA is made of two strands (helixes or helices) that twist around rungs of bases.

•True

Statement #6

• These two strands are written correctly as complementary DNA.

DNA Strand #1: A T T C G C T C A G T A

DNA Strand #2: T T A T C G C G T A A T

Statement #6 (FALSE)

DNA Strand #1: A T T C G C T C A G T A

DNA Strand #2: T A A G C G A G T C A T

Statement #7

•DNA replication happens in all cells (sex and somatic).

•True

Statement #8

•Meiosis happens in all cells (sex and somatic)

•False (only in sex cells)

Statement #9

• This cartoon is correctly labeled.

Nucleus

DNA

Protein

Chromosome

Statement #9

• False

Nucleus

Chromosome

Gene

DNA

Statement #10

• This diagram shows represents the process of mitosis.

• True

46Chromosomes

46Chromosomes

46Chromosomes

92Chromosomes

(Duplicate)

(Divide)

Start End

Parent Cell

Daughter Cell

Daughter Cell

Statement #11

• In mitosis of normal human (somatic) cells, the chromosome number has been reduced from 92 to 46 in step B.

• False (E)

A B

C

DE

Statement #12

•In DNA replication, the enzyme DNA polymerase has the job of adding new single letter (nucleotides) to the growing strand of new DNA.

•True

Statement #13

•DNA replication takes one two-stranded DNA molecule and turns it into two one-stranded DNA molecules.

•False

A

B

C

D

A

B

Statement #14

The nucleotide sequences of A and B are exactly the same.

A

B

C

D

A

B

Statement #14•False: they are complementary.

The nucleotide sequences of A and B are exactly the same.

A

B

C

D

A

B

Statement #15

The nucleotide sequences of A and C are exactly the same.

A

B A

B

C

D

A

B

C

D

A

B

Statement #15

•True!

The nucleotide sequences of A and C are exactly the same.

Reflection

•Think back through the “On Your Feet” activity.

•Identify facts or understandings that were clarified (made more clear and correct) through these exercises.

•What part, if any, of these exercises helped to clear up your understanding the most?