DNA, RNA, Transcription & Translation Review

If a DNA molecule is 34% guanine, how much adenine will it contain?

• 34%

• 16%

• 48%

• 66%

After DNA is unwound, what occurs next?

• The covalent bonds between sugar and phosphate molecules are broken by helicase.

• The hydrogen bonds between sugar and phosphate molecules are broken by DNA polymerase.

• The hydrogen bonds between pairs of nitrogenous bases are broken by helicase.

• The covalent bonds between pairs of nitrogenous bases are broken by DNA polymerase.

Which complementary strand does a DNA strand with bases TACGTT produce?

• A) AUCGA

• B) ATGCAA

• C) ATCGAA

• D) AUCGTT

DNA consists of two strands joined together by complementary base pairing. Fill in the blank: DNA is made of linked nucleotides which are each made of a sugar, a phosphate, and a ____.

• Protein

• Lipid

• Nitrogen base

• Carbohydrate

Which of the following bases is found in RNA only?

• Cytosine

• Thymine

• Guanine

• Uracil

Which of these sequences correctly describes how DNA is copied?

• Bonding of bases - separation of strands - base pairing

• Separation of strands - bonding of bases - base pairing

• Bonding of bases - base pairing - separation of strands

• Separation of strands - base pairing - bonding of bases

Enzymes are added to detergents to break down proteins from food and other substances that may stain clothing. Which would most likely inhibit the ability of the enzymes to remove the stain on her shirt?

• the amount of dissolved minerals in the water

• the type of fibers from which her shirt was made

• the temperature of the water

• the fragrances in the detergent

Tags

NGSS.HS-PS1-5

Enzymes influence chemical reactions in living systems by:

• Combining with excess hydrogen to form gaseous wastes

• Affecting the rate (speed) at which reactions occur

• Providing the substrate required for the reaction to occur

• Absorbing water released when polymers are formed

Fill in the blank: The enzyme's activity is affected by ______. (Check all that apply.)

• the shape of the enzyme

• the temperature of the environment

• the presence of a substrate

• the pH level

How does the addition of heat affect the ability of an enzyme to help the sugar molecules form a bond?

• A. Heat allows the sugar molecules to bond more quickly.

• B. Heat provides places on the enzyme for other molecules to bond.

• C. Heat changes the enzyme so that the sugar molecules can no longer bond.

• D. Heat does not affect the enzyme or substrate.