Which statement best describes the role of the cell membrane in this model?

• The cell membrane is an impermeable barrier that prevents water from entering the cell.

• The cell membrane allows solutes to enter the cell, which causes the cell to shrink.

• The cell membrane allows water to enter and leave the cell.

• The cell membrane removes solutes from the environment.

Tags

NGSS.HS-LS1-3

Fill in the blank: In the experiment, the egg placed in pure water will ____.

• A) shrink

• B) swell

• C) remain the same size

• D) dissolve

Tags

NGSS.HS-LS1-3

Which of these describes a difference between viruses and cells?

• Cells contain protein, and viruses contain only carbohydrates.

• Viruses have flagella, and cells have only cilia.

• Cells reproduce independently, and viruses require a host to reproduce.

• Viruses have membranes made of proteins, and cells have membranes made of nucleic acid.

Proteins and polysaccharides are polymers. These polymers are formed by dehydration synthesis. Which statement correctly identifies a difference in the structure of proteins and polysaccharides?

• Only polysaccharides are comprised of repeating units of cytosine, adenine, guanine, and thymine.

• Only proteins are formed from amino acids joined by peptide bonds.

• Only polysaccharides can be folded and twisted to very specific shapes.

• Only proteins can be large molecules with thousands of subunits.

Which of the following biomolecules typically contains both nitrogen and phosphate?

• Lipid

• Protein

• Nucleic acid

• Carbohydrate

Which of the following is a complex carbohydrate made by linking molecules of glucose?

• Starch

• Cellulose

• Glycogen

• All of the above.

The complex carbohydrate _______ is primarily used for energy storage in animals.

• Starch

• Cellulose

• Glycogen

Which of the following is a common function of all transmembrane proteins?

• Stop chemical reactions within the cell

• Synthesize molecules that signal other cells

• Help the cell interact with its external environment

• Remove large waste particles from the cytoplasm of the cell.

Fill in the blank: One of the functions of transmembrane proteins is to _______ with the external environment.

• communicate

• isolate

• destroy

• ignore

Which statements best compare a function of proteins and lipids in a human cell?

• A) Proteins provide energy for cellular processes. Lipids catalyze chemical reactions inside the cell.

• B) Proteins catalyze chemical reactions inside the cell. Lipids allow for the transport of certain molecules into and out of the cell.

• C) Proteins allow for the transport of certain molecules into and out of the cell. Lipids store genetic information for cells.

• D) Proteins store genetic information for cells. Lipids provide energy for cellular processes.