Biology

SB1a. A lab technician needs to determine whether cells in a test tube are prokaryotic or eukaryotic. The technician has several dyes she could use to stain the cells. Four of the dyes are described in the table below.

• acridine orange
• osmium tetroxide
• eosin
• Nile blue

SB1a. A type of cell that can exist in broad range of environmental conditions, can rapidly multiply, and lacks a nucleus is called what type of cell?

• Animal
• Eukaryote
• Plant
• Prokaryotes

SB1a. The drawing below illustrates a small portion of the molecules that make up a cell membrane.

What is an important function of the cell membrane in this model?

• Help cells recognize each other
• Packaging cell products for export
• Control the passage of materials
• Proving energy for the cell

SB1a. Prokaryotes are structurally simple organisms that have existed over two billion years. Which of the following are prokaryotes?

• Bacteria
• Fungi
• Plants
• Viruses

SB1a.What is one major difference between prokaryotes and eukaryotes?

• Prokaryotes have many DNA replication origins while eukaryotes do not.
• Eukaryotes have circular DNA while prokaryotic DNA forms a double helix shape.
• Eukaryotes have membrane-bound organelles while prokaryotes do not.
• Prokaryotic cells have a nucleus while eukaryotic cells do not.

SB1b. The role of the enzyme in a chemical reaction is speed up the reaction by _________________

• Increasing the activation energy
• Lowering the activation energy
• Increasing the pH of the reaction
• Decreasing the temperature of the reaction

SB1b. Which of the following best describes the function of an enzyme?

• Speed up reactions
• Lower Activation energy
• Break substrates down into smaller units
• All of the above are true

SB1b.The specific location where a substrate binds on an enzyme is called the:

• Active site
• Catalyst region
• Connection site
• Reactant complex

SB1b. Enzymes influence chemical reactions in the body by

• providing the substrate required for the reaction to occur
• affecting the rate at which reactions occur
• absorbing water released when polymers are formed
• combining with excess hydrogen to form wastes

Tags

NGSS.HS-LS1-3

SB1d. Many bacteria live in fresh water. Which of these statements best describes what will happen when freshwater bacterial cells are placed in salt water?

• Water leaves the cell, causing the cell to expand
• Water leaves the cell, causing the cell to shrink.
• Water enters the cell, causing the cell to expand.
• Water enters the cell, causing the cell to shrink.

Tags

NGSS.HS-LS1-3