Biology Chapter

All cells have three things in common: ____

• Cytoplasm, DNA, and organelles with membranes

• A plasma membrane, DNA, and a nucleus

• Cytoplasm, DNA, and a plasma membrane

• A cell wall, cytoplasm, and DNA

Which of the following is not a principle of the cell theory?

• Every cell arises from another cell

• A cell is alive even as part of a multicelled body

• Eukaryotic cells have a nucleus, and prokaryotic cells do not

• The cell is the smallest unit of life

The surface-to-volume ratio _____

• does not apply to prokaryotic cells

• contrains cell size

• is part of the cell theory

A plasma membrane _____.

• controls exchange between the cell and the external environment

• is a mesh of intermediate filaments

• is a type of extracellular matrix

True or false? Ribosomes are only found in eukaryotes

• true

• false

Unlike eukaryotic cells, prokaryotic cells _____.

• have no nucleus

• have RNA but not DNA

• have no ribosomes

• no nucleus and no ribosomes

What controls the passage of molecules into and out of the nucleus?

• endoplasmic reticulum, an extension of the nucleus

• nuclear pores, which consist of membrane proteins

• nucleoli, in which ribosome subunits are made

• dynamically assembled mircotubules

• tight junctions

The main function of the endomembrane system is:

• building and modifying proteins and lipids

• isolating DNA from toxic substances

• secreting extracellular matrix onto the cell surface

• producing ATP by aerobic respiration

Enzymes contained in _____ break down worn out organelles, bacteria, and other particles

• lysosomes

• amyloplasts

• endoplastic reticulum

• peroxisomes

Put the following structures in order according to the pathway of a secreted protein:

1. plasma membrane
2. golgi bodies
3. endoplasmic reticulum
4. post-golgi vesicles

• 3, 2, 4, 1

• 1, 2, 3, 4

• 4, 3, 2, 1

• 2, 3, 4, 1