Which of these will most likely happen if an enzyme is added to a certain chemical reaction? 

Select TWO correct answers.

• The rate of reaction will decrease.

• The reaction will completely stop.

• The rate of reaction may speed up or may slow down.

• The activation energy will be lowered.

• The rate of reaction will start to increase.

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112.42.c.11.B

Which characteristic of prokaryotic organisms makes them different from eukaryotes?

• Prokaryotic cells do not have a membrane-bound nucleus.

• Prokaryotes do not have chromosomes.

• Prokaryotes are made of cells.

• 
  Prokaryotes have DNA.

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112.42.c.5.B

Humans have thousands of genes that combine in different ways to help create unique individuals. Where is the genetic code primarily located?

• Ribose sugars in RNA

• The amount of phosphates in DNA

• The sequence of Nucleotides in DNA

• The size of exons in RNA

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112.42.c.7.A

Some students used information they gathered from lab investigations to prepare a table. They

entered the table in their lab notebooks.

Which of these correctly identifies the two cells described in the table?

• Both and are eukaryotic.

• Both Cell 1 and Cell 2 are prokaryotic.

• Cell 1 is prokaryotic, and Cell 2 is eukaryotic.

• Cell 1 is eukaryotic, and Cell 2 is prokaryotic.

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112.42.c.5.B

Students observe structures in a cell on a microscope slide. The students identified a cell

membrane, a cell wall, and DNA floating freely in the cytoplasm. Based on the students'

observations, which statement below correctly identifies the cell on the microscope slide?

• The cell is a prokaryote because there is a cell wall and a cell membrane.

• The cell is a eukaryote because there is a cell wall and a nucleus.

• The cell is a eukaryote because there is a cell membrane and no nucleus.

• The cell is a prokaryote because there is DNA and no nucleus.

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112.42.c.5.B

Enzymes are​ (a)   that bind to specific​ (b)   . They​ (c)   reaction rates by​ (d)   activation energy.

• Catalysts
• Substrate
• speed up
• lowering
• products
• Slow down
• increasing

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112.42.c.11.B

Enzymes are proteins that help increase the rate of chemical reactions inside cells. These proteins

are composed of many simpler molecules called amino acids. Which of the following suggests that

the shape of an enzyme determines the enzyme's ?

• Enzymes are by neighboring molecules.

• Enzymes are specific to a substrate.

• Enzymes can be found in all life forms.

• Enzymes will change their shape to fit a substrate.

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112.42.c.11.B

Which part of a DNA molecule is responsible for the direct specific traits in an organism?

• The number of deoxyribose sugars in the DNA molecule.

• The amount of hydrogen bonds that hold the strands of DNA together.

• The order of phosphates along each DNA strand.

• The sequence of nucleotide bases in the DNA molecule.

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112.42.c.7.A

A segment of DNA is shown in the diagram. Choose the correct answer from each drop-down menu to complete the statement.

"In the DNA diagram X, is​ (a)   , structure Y is​ (b)   , and structure Z is ​ (c)   ."

• the sugar-phosphate backbone
• a hydrogen bond
• a nitrogenous base
• nucleotide
• a deoxyribose sugar
• a double helix

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112.42.c.7.A