Midterm 1

Question 1

All cells require oxygen to live:

Answer 1

False

Question 2

In what way are cells all alike?

Answer 2

They store genetic instructions in DNA.

Question 3

How long ago is it estimated that the common ancestor for all of life existed?

Answer 3

Between 3.5 and 3.8 billion years ago.

Question 4

Genetic change followed by selection are the fundamentals of what process?

Answer 4

Evolution

Question 5

Which statement is NOT true about the differences between liver cells and kidney cells from the same animal?

Answer 5

The different cells express different genes.

Question 6

What is cell theory?

Answer 6

• All cells are formed by the division of preexisting cells.

Question 7

Individual atoms can be seen with an electron microscope

Answer 7

False.

Question 8

Which of the following cannot be seen with a light microscope?

Answer 8

Ribosome.

Question 9

What do eukaryotic cells have that prokaryotes lack?

Answer 9

A nucleus and other internal organelles.

Question 10

Which of the following are prokaryotes?

Answer 10

Archea and bacteria.

Question 11

At a molecular level, the members of the two domains of prokaryotes—the archaea and bacteria—differ as much from each other as either does from the eukaryotes

Answer 11

True

Question 12

The DNA in the nucleus of eukaryotic cells is separated from the cytoplasm by:

Answer 12

Nuclear envelope

Question 13

Which statement is not true about mitochondria:

Answer 13

Mitochondria are not present in plant cells

Question 14

Which statement is NOT true of chloroplasts?

Answer 14

Chloroplasts are present in essentially all eukaryotic cells.

Question 15

Which of the following organelles is an irregular maze of interconnected spaces enclosed by a membrane that functions as the site where most cell membrane components, as well as materials destined for export from the cell, are made?

Answer 15

Endoplasmic Reticulum

Question 16

Which of the following organelles is a stack of flattened membrane-enclosed sacs, functioning in receiving and often chemically modifying the molecules made in the endoplasmic reticulum, and then directing them to the exterior of the cell or to various locations inside the cell?

Answer 16

The Golgi Apparatus

Question 17

The larges single compartment in most cells is:

Answer 17

The cytosol.

Question 18

Which of these is not part of the cytoskeleton?

Answer 18

Cytosol

Question 19

What role is not performed by the cytoskeleton?

Answer 19

Generate chemical energy

Question 20

In plant cells a tough cell wall takes the place of a cytoskeleton:

Answer 20

False

Question 21

Which organelle’s ancestor was likely engulfed by primitive eukaryotes to help the cell survive in an oxygen-rich atmosphere?

Answer 21

Mitochondrion

Question 22

What mediates the exchange of materials between the endoplasmic reticulum, Golgi apparatus, the lysosomes, and the outside of the cell?

Answer 22

Vesicles

Question 23

Which of the following organelles is a small, irregularly shaped organelle in which intracellular digestion occurs?

Answer 23

Lysosome

Question 24

What is the name of the process by which eukaryotic cells engulf material captured from an external medium?

Answer 24

Endocytosis

Question 25

The cytoskeleton is one of the few permanent fixtures in the cell

Answer 25

False