Lecture Quizzes

Question 1

The site of aerobic respiration in eukaryotic cells is___________

Answer 1

Mitochondria

Question 2

Which cells in our body contains abundant peroxisomes?

Answer 2

Liver cells

Question 3

Which of the following contain their own genomes?

Answer 3

Mitochondria and chloroplasts, but not peroxisomes

Question 4

T or F : The inner membrane of mitochondria is fairly smooth.

Answer 4

False

Question 5

The infoldings of the inner mitochondrial membrane are called

Answer 5

cristae

Question 6

The inner compartment of mitochondria is called the

Answer 6

matrix

Question 7

What product of glycolysis is transported into the mitochondria?

Answer 7

Pyruvate

Question 8

The citric acid cycle consists of the incorporation of _______ and its oxidation to produce _______.

Answer 8

acetate from acetyl CoA; CO2, NADH, and FADH2

Question 9

Most small molecules are permeable across

Answer 9

the outer, but not the inner, mitochondrial membrane.

Question 10

How do the small molecules pass through the outer membrane of mitochondria? Through

Answer 10

Porins

Question 11

Which of the following division technique is similar in mitochondria and bacteria?

Answer 11

Binary Fission

Question 12

In a eukaryotic cell, most of the enzymes of the citric acid cycle are located in the

Answer 12

mitochondrial matrix

Question 13

Pyruvate, the end product of glycolysis, enters the citric acid cycle after it has been converted to

Answer 13

acetyl-CoA

Question 14

The lipids present in cell membrane are _____________

Answer 14

Amphipathic

Question 15

Which of the following types of molecules are the major structural components of the cell membrane?

Answer 15

phospholipids

Question 16

Which of the following is allowed in context with a plasma membrane?

Answer 16

Transportation

Question 17

Which of the following is covalently attached to a lipid molecule in cell membrane?

Answer 17

Lipid-anchored protein

Question 18

Integral proteins are also known as ____________

Answer 18

Transmembrane proteins

Question 19

Transmembrane domain of a transmembrane protein is present as _______________

Answer 19

Alpha-helix

Question 20

In order for a protein to be an integral membrane protein it would have to be which of the following?

Answer 20

amphipathic

Question 21

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

Answer 21

small and hydrophobic

Question 22

Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

Answer 22

CO2

Question 23

In which of the following means of transport a cell expels large molecules out of it?

Answer 23

Exocytosis

Question 24

Which of the following transports only one kind of substrate?

Answer 24

Uniport carriers

Question 25

What do you infer from the word diffusion?

Answer 25

It’s moving from higher concentration to lower concentration

Question 26

T or F : The cell walls of bacteria and eukaryotes are structurally very different.

Answer 26

True

Question 27

T or F: Bacteria can be divided into classes namely gram-positive bacteria and gram-negative bacteria based on their cell wall.

Answer 27

True

Question 28

What organism lacks cell wall

Answer 28

Protoza

Question 29

What is the key role of fibroblasts

Answer 29

Producing extracellular matrix

Question 30

Which component is present in the cell wall of fungi

Answer 30

Chitin

Question 31

Bacteria are surrounded by rigid cell walls of

Answer 31

Peptidoglycan

Question 32

Homophilic interaction

Answer 32

Are when adhesion molecule on the surface of one cell binds to the same molecule on the surface of another cell.

Question 33

Heterophilic interaction

Answer 33

Are when adhesion molecule on the surface of one cell recognizes a different molecule on the surface of another cell.

Question 34

In which type of signaling, the cell that expresses the messenger molecule also produces the receptors for that messenger?

Answer 34

autocrine

Question 35

T or F : Cell signaling is a process by which cells communicate.

Answer 35

True

Question 36

Endocrine messengers are also called __________

Answer 36

hormones

Question 37

Protein kinases and phosphatases act by altering ______ of the signaling proteins

Answer 37

conformation

Question 38

The process by which extracellular messages translate into a cascade of intracellular changes is termed _________________

Answer 38

signal transduction

Question 39

G-protein coupled receptors contain ________ transmembrane alpha helices.

Answer 39

7

Question 40

Which of the following signal molecule is NOT used for extracellular signaling?

Answer 40

Cyclic AMP

Question 41

T or F : In endocrine signaling, the signal molecule act on target cell only in close proximity.

Answer 41

False

Question 42

Arrange the following sequence of extracellular signaling in the correct order? 1) Transport of signal to a target 2) Start of signal transduction pathways 3) Signaling cell synthesize and release signaling molecules 4) Binding of the signal to the specific receptor

Answer 42

3,1,4,2

Question 43

A hormone or ligand can be considered as __________

Answer 43

First messenger

Question 44

What family of receptors mediate the biologic actions of a wide variety of ligands, including insulin, and other growth factors?

Answer 44

Receptor Tyrosine Kinases

Question 45

What happens when a ligand binds to the receptor tyrosine kinase?

Answer 45

Dimerizes