MSU Biology Test 2

Which of the following is not part of the cell theory?

• Cells are the smallest units of matter

• New cells come only from pre-existing cells by division

• All cells have similar compositions

• All living organisms are composed of one or more cells

The smaller the cell, ____ the diffusion across its membrane.

• Greater

• Lesser

• No change in

Surface area to volume ratio dictates

• increases in cell size

• maximum size a cell can get

• diffusion rate across a membrane

• both b and c

Prokaryotic is to ___ as eukaryotic is to ___.

• plant; bacteria

• yeast; bacteria

• yeast; plant

• bacteria; yeast

Which of the following refers to the fluid like region of the cell rich in water, ions, and other macromolecules?

• cytosol

• extracellular matrix

• cytoplasm

• cytoskeleton

True or false: The plasma membrane is a fixed rigid structure that allows specific molecules to pass through.

• True

• False

What type of molecules can pass through the cell membrane readily?

• Polar, large

• Small, polar

• Nonpolar, large

• Small, nonpolar

What order of organelles are involved in the endomembrane system?

• nuclear envelope, golgi apparatus, mitochondria, plasma membrane

• mitochondria, golgi apparatus, lysosomes, plasma membrane

• nuclear envelope, ER, golgi apparatus, lysosomes, plasma membrane

• nuclear envelope, golgi apparatus, ER, lysosomes, plasma membrane

What does the term amphipathic refer to?

• hydrophobic and hydrophilic interactions

• the solubility of a molecule across a membrane

• the structure of two DNA strands

• waters polar ability to bind to other polar molecules

Why is the cell membrane referred to as a fluid mosaic model?

• the membrane is flexible and fluid like

• the cytoplasm is made up of the cytosol and organelle fluid

• it is composed of molecules such as phospholipids, carbs, and proteins embedded in the double layer of phospholipids

• the membrane allows fluids such as water to readily pass

• A & C