Biology TEKS 7.A - DNA Structure

What makes up the SIDES of a DNA ladder?

• nitrogen bases

• sugars & phosphates

• genes & chromosomes

• RNA

Tags

TX.112.42.C.7.A.

What makes up the rungs (steps) of a DNA ladder?

• sugars & phosphates

• nitrogen bases

• sugars

• genes & chromosomes

Tags

TX.112.42.C.7.A.

Which of the following best describes a DNA molecule?

• double helix
• contains ribose
• made of amino acids
• contains Uracil

Tags

TX.112.42.C.7.A.

Nitrogenous bases are joined by which type of bond?

• polar bonds
• ionic bonds
• covalent bonds
• hydrogen bonds

Tags

TX.112.42.C.7.A.

What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base
• sugar, oxygen, nitrogen base
• sugar, phosphate, nitrogen base
• sugar, phosphate, protein

Tags

TX.112.42.C.7.A.

Cytosine always pairs with

• Adenine
• Thymine
• Uracil
• Guanine

Tags

TX.112.42.C.7.A.

What is the complement to the DNA strand below:
5'-ATGCCAT-3'

Answer explanation

complimentary strand of DNA is the "other side" of the DNA that matches with the bases they gave you!

Think:

A --> T

C --> G

Tags

TX.112.42.C.7.A.

What is the significance of the sequence (order) of the Nitrogen Bases in DNA?

• The order of the Nitrogen Bases determines the number of chromosomes present in an organism.
• The order of the Nitrogen Bases determines the traits that an organism will possess (have).
• The order of the Nitrogen Bases determines the gender of an organism.
• The order of the Nitrogen Bases determines whether an organism is abiotic biotic.

Tags

TX.112.42.C.7.A.

Assume that you have straight hair and your sibling has curly hair. What accounts for this difference?

• You have DNA and your sibling does not.
• Your sequence of nitrogen bases is different than your sibling.

• Your sibling has a weave. 
• Your sibling has a genetic mutation. 

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TX.112.42.C.7.A.

Why is DNA important?

• it is very small and very complicated
• it's in everything
• it serves as the blueprint for traits of all living things
• because we eat it every day for energy

Tags

TX.112.42.C.7.A.