Basic cell biology

Question 1

The Presence Of Mitochondria And Chloroplasts In Cells Is The Evidence That Eukaryotes Originated From Prokaryotes?

1. FALSE
2. TRUE

Answer 1

TRUE

Question 2

Eukaryotes Have No Nucleus.

1. FALSE
2. TRUE

Answer 2

FALSE

Question 3

According To The Cell Theory Proposed By Scheiden And Schwann In 1838. Which Statements Are TRUE ?

1. All life forms are made from one or more cells.
2. The cell is the smallest life form.
3. Cells only arise from pre-existing cells.
4. All of the above

Answer 3

All of the above

Question 4

Mitosis Produces 2 Daughter Cells Genetically Identical Two Each Other and to the Parent Cell.

1. TRUE
2. FALSE

Answer 4

TRUE

Question 5

Which Is The Normal Sequence Of The Cell Cycle In Eukaryote?

1. G1 to G2 to S to M to Cytokinesis
2. G1 to M to G2 to S to Cytokines
3. G1 to S to M to G2 to Cytokinesis
4. G1 to S to G2 to M to Cytokinesis

Answer 5

G1 to S to G2 to M to Cytokinesis

Question 6

The Centromere Links.

1. Sex chromosomes
2. Sister chromosomes
3. Sister chromatids

Answer 6

3.Sister chromatids

Question 7

Within The Eukaryotic Cell, the Secretory Apparatus Is Found In:

1. Rough endoplasmic reticulum
2. Smooth endoplasmic reticulum
3. Lysosome
4. Golgi apparatus

Answer 7

2. Smooth endoplasmic reticulum

Question 8

The Secretory Pathway For Proteins Is:

1. secretory vesicles -> R.E.R. -> Golgi -> cell exterior
2. Golgi -> secretory vesicles -> R.E.R. -> cell exterior
3. R.E.R. -> Golgi -> secretory vesicles -> cell exterior
4. S.E.R. -> Golgi -> secretory vesicles -> cell exterior

Answer 8

3. R.E.R. -> Golgi -> secretory vesicles -> cell exterior

Question 9

The Smooth Endoplasmic Reticulum SER:

1. is associated with ribosomes
2. functions in protein processing
3. is together with the rough endoplasmic reticulum (RER) the largest cell organelle in most eukaryotic cells

Answer 9

3. is together with the RER the larges cell organelle in most eukaryotic cells.

Question 10

The Smooth Endoplasmic Reticulum SER Is The Most Common Organelle In The Ooplasm

1. Yes
2. No

Answer 10

Yes

Question 11

In Ooplasma in the SER Exist as:

1. as isolated vesicular SER only
2. as isolated vesicular and large aggregates
3. as large aggregates only

Answer 11

2. as isolated vesicular and large aggregates

Question 12

The Golgi Apparatus

1. is involved in protein processing
2. in involved in protein and lipid processing and sorting
3. is involved in lipid processing and sorting is in plant cells
4. the site of synthesis of the cell wall polysaccharides.
5. All of the above.

Answer 12

5. ALL

Question 13

which is true regarding, Golgi Complexes Are

1. very common in mature oocytes
2. very rare in mature oocytes
3. are common and large juxta-nuclear in fertilized pronuclear ova

Answer 13

2 and 3 are correct.

Question 14

All are true about Annulate Lamellae Except:

1. are most common in fertilized pronuclear ova
2. are rare in blastomeres where there is a high turnover of nuclear envelope membranes
3. are closely associated with nuclei.

Answer 14

2. is the best answer.
   Annulate Lamellae are most common in fertilized pronuclear ova, and closely associated with nuclei

Question 15

The Main Function of Mitochondria Is:

1. protein synthesis
2. anaerobic fermentation
3. lipid synthesis
4. to generate energy
5. to store energy

Answer 15

4. to generate energy

Question 16

Mitochondria

1. have their own DNA
2. are normally exclusively maternally inherited in human
3. can occasionally be paternally inherited in mussels, fruit-flies and honeybees
4. all true.

Answer 16

4- all true

Question 17

Import of Proteins into Mitochondria is mediated by Hsp70

1. Yes
2. No.

Answer 17

1. Yes

Question 18

All about Mitochondrial DNA are true EXCEPT:

1. has a circular structure
2. codes for 37 genes
3. codes for less than 25 genes
4. multiple deletions are associated with a decline in sperm motility

Answer 18

all true except (3)

Question 19

Live Births have been obtained after Mitochondrial Transfer into Human Oocytes

1. Yes
2. No

Answer 19

1.Yes

(2016 first mitochondrial donation)

Question 20

Nuclear envelope dis-assembly (disappear) marks to the end of prophase of mitosis in most cells

1. Yes
2. No

Answer 20

1. YES

Question 21

Nucleoli

1. are not surrounded by a membrane
2. are organized around specific chromosomal regions
3. are morphologically consisting of 2 regions
4. morphological regions might represent the progressive stages of rRNA transcription progressing

Answer 21

1,2 and 4 are true

Nucleoli: are not surrounded by a membrane, organized around specific chromosomal regions, and morphological regions might represent the progressive stages of rRNA transcription progressing.

Question 22

During ribosome formation there is no molecular traffic between cytoplasm and nucleus

1. Yes
2. No

Answer 22

2. No

Question 23

Dis-assembly of the nuclear envelope is similar to the breakdown of the endoplasmic reticulum.

1. Yes
2. NO

Answer 23

1. YES

Question 24

which is NOT an event of the Nuclear Envelope Dis-assembly

1. nuclear membranes are fragmented in vesicles
2. nuclear pore complexes dissociate
3. nuclear lamina polymerize

Answer 24

3. nuclear lamina polymerize

Question 25

The fundamental building block of all **cell membranes** are: 1. proteins 2. polysacharides 3. phospholipids 4. glycoproteins

Answer 25

3. phospholipids

Question 26

Proteins constitute between 1. 10 and 20 % of the total mass of the cell membrane 2. less than 10% of the total mass of the cell membrane 3. between 20 and 75 % of the mass of the cell membrane 4. cell membranes do not contain any protein

Answer 26

3. Mass of the cell membrane consist of 20-75% proteins

Question 27

Which molecules make also part of the mammalian cell membrane? 1. cholesterol 2. glycolipids 3. sphingomyelin

Answer 27

all true ## Footnote Cholesterol, glycolipids and sphingomyelin: Molecules make also part of the mammalian cell membrane

Question 28

In cell membrane: Bilayers phospholipids can rotate and move laterally. 1. Yes 2. No

Answer 28

YES

Question 29

Which molecules belong to the group of **phospholipids** that compose the mammalian cell membrane? 1. phosphatidylcholine 2. phosphatidylserine 3. phosphatidylethanolamine 4. sphingomyelin 5. All TRUE

Answer 29

ALL TRUE