What is DNA?

What Does DNA Do?

DNA stands for...

DeoxyriboNucleic Acid

Multiple Choice

What type of organic molecule is DNA?

• lipid

• protein

• carbohydrate

• nucleic acid

Multiple Choice

Where in the cell DNA is found?

• cytoplasm

• ribosome

• vacuole

• nucleus

DNA-found in all cells

• packed tightly within chromosomes within the nucleus

• a segment of DNA code for traits-we call it genes

Who Discovered DNA?

• Watson and Crick's discovery

• the two-strand DNA, double helix

• DNA-the molecule containing human genes was discovered in 1953

Multiple Select

What is the relationship between chromosomes, DNA, and genes?

• DNA are made of proteins.

• Chromosomes are made of DNA.

• Genes are segments of DNA.

• Genes contains code for a specific protein.

Multiple Choice

DNA molecule is made of

• sequence of amino acids

• sequence of nucleotides

• sequence of fatty acids

• monosaccharides

Structure of DNA

• made of repeating subunits called nucleotides

• a nucleotide- composed of a phosphate group, deoxyribose sugar, a nitrogenous base

Multiple Select

A single nucleotide is made of 3 components. Which of the following are components of a single nucleotide?

• sugar

• amino acid

• a nitrogen base

• phosphate group

Multiple Choice

What is the structure of DNA?

• single-helix

• double-helix

• triple-helix

Genetic Information

• are found in the nitrogen bases

• A-adenine

• T-thymine

• C-cytosine

• G-guanine

• A-T; C-G

Multiple Choice

How many nitrogen bases?

• 4

• 3

• 2

• 1

Multiple Select

The 4 nitrogen bases are paired, what are the correct base-pairs?

• A-T

• C-G

• C-T

• G-C

Magnified DNA

is double-helix, due to the pairing of the 4 nitrogen bases: A-T and C-G

A-T

G-C

T-A

C-G

A-T

G-C

Multiple Choice

The DNA molecule is like a twisted ladder. What components make up the "rail" of the ladder?

• the paired bases

• the phosphate group

• the deoxyribose sugar

• the alternating phosphate group and deoxyribose sugar

Multiple Choice

In a double-helix DNA, what components make up the "rungs" of the ladder?

• the sugar

• the paired bases

• the phosphate group

• both phosphate and sugar

Original & Complimentary Strands

• first sequence(original strand):

• A, G, T, C, A, G

• T, C, A, G, T, C

• complimentary strand(2nd strand)

Multiple Choice

What is the correct complementary strand that matches the DNA sequence, TAC

• TAC

• CAT

• ATG

• GTA

Multiple Choice

In a DNA molecule, where are the codes for proteins are found?

• in the phosphate group

• in the deoxyribose sugar

• in the hydrogen bond

• in the bases

Multiple Choice

What is the base paired with guanine in DNA molecule?

• cytosine only

• adenine only

• cytosine and adenine

• adenine and thymine

Multiple Choice

Which is the correct statement about DNA, genes, and proteins?

• DNA contains proteins.

• DNA, genes and proteins are the same.

• DNA contains genes that codes for proteins.