Exam 2

Question 1

Which of the following is true for cells?
A)all organisms are composed of cells
B) cells are the smallest living things
C) Cells arise only from pre-existing cells
D) all the above

Answer 1

D) all the above

Question 2

Warm temperatures tend to ______ the rates of diffusion

Answer 2

Increase

Question 3

As cell size increases, its volume increases much more rapidly than its surface area.

True or False?

Answer 3

True

Question 4

DNA is located in a cells nucleus.

T or F

Answer 4

True

Question 5

Archaea and bacteria are prokaryotic domains.

T or F

Answer 5

True

Question 6

The lack of a membrane bound nucleus is a characteristic of?

Answer 6

Prokaryotes

Question 7

Only eukaryotic cells have ribosomes.

T or F

Answer 7

FALSE

Question 8

Which of the following have cells without walls?
A)Bacteria
B)Fungi
C)Plants
D)animals

Answer 8

D) animals

Question 9

Membrane bound organelles are found in?

Answer 9

Eukaryotes

Question 10

Plasma membranes are found only in Eukaryotic cells.

T or F

Answer 10

FALSE

Question 11

Chloroplasts and Specialized vacuoles are found in?

Answer 11

Plant cells and some protists

Question 12

The nucleolus is responsible for ribosome synthesis.

T or F

Answer 12

TRUE

Question 13

Rough ER has ribosomes attached to it.

T or F

Answer 13

TRUE

Question 14

Packaging and distribution of molecules is the function of the Golgi apparatus.

T or F

Answer 14

TRUE

Question 15

Digestive vesicles containing enzymes are the ____

Answer 15

Lysosomes

Question 16

Vacuoles are membrane bound structures found in _____

Answer 16

Plants

Question 17

Which organelle is responsible for ATP synthesis?

Answer 17

Mitochondria

Question 18

Mitochondria and chloroplasts have their own DNA.

T or F

Answer 18

TRUE

Question 19

Microfilaments, microtubules and intermediate fibers are components of the _____

Answer 19

Cytoskeleton

Question 20

Cilia are typically shorter and more numerous than flagella.

T or F

Answer 20

TRUE

Question 21

Chitin is found in….

Answer 21

Fungi and arthropod cell walls

Question 22

Adhesive junctions, tight junctions, and communicating junctions are types of ____

Answer 22

Cell connections

Question 23

For membranes, the phospholipid bilayer is arranged with hydrophobic portions to the inner side and hydrophilic portions to the outside.

T or F

Answer 23

TRUE

Question 24

Which of the following is NOT true for cell membranes?
A) Provides a selectively permeable barrier
B) Contains proteins that span its width
C) Only has proteins at the outer surface

Answer 24

C) only has proteins at the outer surface

Question 25

Lipids in the cell membrane provide it with fluidity. T or F

Answer 25

TRUE

Question 26

The tail part of phospholipids are hydrophilic. T or F

Answer 26

FALSE

Question 27

Hydrogen bonds hold the phospholipid bilayer together. T or F

Answer 27

TRUE

Question 28

Saturated fatty acids make the membrane more fluid than unsaturated fatty acids. T or F

Answer 28

FALSE

Question 29

Which of the following is true for membrane proteins? -attach to cytoskeleton -act as cell surface receptors -enzymes -transporters -all the above

Answer 29

E) all the above

Question 30

Warm temps make the membrane more fluid than cold temps. T or F

Answer 30

TRUE

Question 31

Polar regions of trans membrane proteins protrude from both sides of the phospholipid bilayer. T or F

Answer 31

TRUE

Question 32

Which of the following is NOT true for passive transport? A) No energy required B) Molecules move in response to a concentration gradient C) its continuous

Answer 32

C) it’s continuous

Question 33

During diffusion, molecules move from an area oh high concentration to low concentration. T or F

Answer 33

TRUE