Bio 211 Quiz 2

Which of the following labels the nucleolus and the rough endoplasmic reticulum?

1 and 4

Which of the numbered organelles is a mitochondria?

3

In the picture to the right, cholesterol is ______ and a glycoplipid is _______.

E; B

For a protein to be an integral membrane protein, it would have to be ______.

amphipathic

Which of the following is a channel protein that allows water to move much faster across cell membranes?

aquaporins

______ are examples of prokaryotes because they do NOT have _____.

bacteria; a nuclear envelope

According to the fluid mosaic model of cell membranes, phospholipids _____.

can move laterally along the plane of the membrane

In the picture to the right, the thicker fiber labeled one is ______ and accounts for 40% of the total protein in the body. Number two is a(n): _____ and three is a ______.

collagen; transmembrane protein (integral); peripheral protein

The sodium-potassium pump is called an electrogenic pump because it _______.

contributes to the membrane potential (negative on the inside, positive on the outside)

The smooth endoplasmic reticulum does all of the following except

export proteins

Carrier proteins

function in passive transport, function in active transport, can function to transport substance both into a cell and outside a cell (A, B, and C are correct)

Plasmodesmata in plant cells are most similar in function to which of the following structures in animal cells?

gap junctions

If a fish has an internal salt concentration of 18 parts oer thousand (ppt) and seawater in 35 ppt the seawater is _____ in comparison to the fish and the net movement of water wil go _____ the fish.

hypertonic, out of

The fluidity of the plasma membrane ______ with a greater percent of unsaturated fatty aid tails in the membrane, ______ with more cholesterol in the membrane at moderately high temperatures, and ________ with more cholesterol in the membrane at low temperatures.

increases; decreases; increases

A _______ is described as a membranous sac of hydrolytic enzymes that work best in an acidic enviornment and fuses with phagocytic food vacuoleto help digest the food, whereas the _____ is the shipping and receiving center for the cell and modifies the carbohydrate portion of glycoproteins?

lysosome; golgi apparatus

Cells require which of the following to form the "9+2" structure of cilia and flagella?

microtubules made of tubulin

Which of the following does not support the endosymbiont theory?

mitochondria and chloroplasts are both photosynthetic organelles

Which of the following is the site of assembly for ribosomal RNA synthesis in eukaryotes (where the large and small units are first assembled independently of one another beofre they become a ribosome?

nucleolus

Which of the following processes includes all other listed?

passive transport

The difference between pinocytosis and receptor-meidated endocytosis is that _______.

pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity

In some ____, the organism secretes a secondary cell wall that is considered part of ______.

plants; the extracellular matrix

Which of the following does not support the cell theory?

prokaryotic cells and eukaryotic cells do not have common ancestry

Active transport

requires energy

Which of the following is not a major function of proteins in the plasma membrane?

responsible for the fluidity nature of plasma membrane

What kinds of molecules pass through a cell membrane most easily?

small and hydrophobic