Biology 1020 LAB

Question 1

Chromosomes first become visible during which phase of mitosis?

Answer 1

Prophase

Question 2

If there are 20 chromotids how many centromeres are there?

Answer 2

10 (one centermere per chromatid pair

Question 3

Imagine looking through a microscope at a squashed onion root tip. The chromosomes of many of the cells are plainly visible. In some cells, replicated chromosomes are aligned along the center of the cells. These cells are in which stage of mitosis?

Answer 3

Metaphase

Question 4

graph G1 is represented by which numers

Answer 4

I and V??

Question 5

graph in the figure which number represents mitosis

Answer 5

IV

Question 6

Cytokinesis usually, but not always follows mitosis. If a cell completed mitosis but not cystokinesis, the result would be a cell with

Answer 6

two nuclei

Question 7

Cells that are in a non dividing state are in which phase?

Answer 7

G0

Question 8

If mammalian cells recieve a go-ahead signal at the G1 check point, they will

Answer 8

Complete the cycle and divide

Question 9

Which of the following is a requirement for the FIRST check point of the cell cycle after mitosis?

Answer 9

Enough Nutrients are present to sustain 2 daughters

Question 10

Which of the following statements about Binary fission is true

Answer 10

Process is similar to the replication of mitchondria

Question 11

LAB a dialysis sac conataining 2% sucrose solution is placed in a beaker containing 2% sucrose solution. which of the following is true?

Answer 11

An aproximetley equal amount of water will move into the sac as will move out of the sac

Question 12

LAB you are examining a cell with an electron microscope and you see the following structures: cell membrane and Ribosomes, which of the following statements regarding the cell you are looking at is true?

Answer 12

This cell could be an animal cell because it has a membrane.

Question 13

LABDuring Lab three you added distilled water to a slide of flaccid live onion cells. which statements re true

Answer 13

the water had a lower concentration of solutes than the onion cell and
the net water flow was out of the cell

Question 14

LABThe following items are added to a test tube and heated:
3ml of benedicts
1ml sucrose
which would you expect

Answer 14

No reaction

Question 15

LABOne of the two yeast cultures you performed the iodoform test on produced alcohol. this production of alcohol involved which of the following steps?

Answer 15

Two of the above are correct! WHICH TWO??

Question 16

LABIn the respirometer experiment with the Tenebrio Larvae, what were you measruing by means of injecting air in the control tube with the syringe?

Answer 16

The change in gas volume due to air pressure or temperature changes

Question 17

LABIdentify the top pigment

Answer 17

carotene

Question 18

LABexamine the chloroplast below. at which location would you expect to find photosynthetic pigments involved in capturing light

Answer 18

c

Question 19

LABThe following items are added to a test tube and allowed to stand for 45 min:
2ml of iki reagent
5 ml of stillate glucose culture medium before fermentation
3 ml 1.5 m NAoh
What results would you expect

Answer 19

None of the above

Question 20

LAB You have a solution of salt water with a concentration of salt at 5%. into this you place an animal cell. the cell shrinks to about 2/3 of its original size and remains stable. Which of the following statements is correct

Answer 20

At the end of the cytoplasm of the cell is isotonic

Question 21

LAB You are examining a cell with an electron microscope and you see the following structures:
Membrane bound nucleus
MitoChrondia
Which is FALSE?

Answer 21

This cell would be a plant cell because it has a mitochondria

Question 22

LAB in laboratory you seperated the pigments involved in photosynthesis by means of paper chromatography. which pigment has the greatest soluability in the solvent used?

Answer 22

D (the circle that is over lapped with another FIND NAMES

Question 23

LAB The following items are added to a test tube and heated:
3 ml of benedicts
1 ml of glucose
which of the following would you expect

Answer 23

e) NONE OF THE ABOVE
NOT a) yellow precipitate
NOT b) a milky white preciptiate
NOT c) no precipitate because reducing sugar will have totally fermented
NOT d) a dark red to black liquid indicating the presence of start

Question 24

One of the two yeast cultures you performed the iodoform test on produced alcohol. this production of alcohol involved which of the following steps?

Answer 24

E) two of the above are correct (fermentation and glycolysis)

Question 25

LAB During lab 3 you added distilled water to the slide of flaccide live onion cells. Using that knowledge as a back ground what would you expect to happen if you repeated the experiment but used your cheek cells instead of onion cells. select the best answer

Answer 25

• The cheek cells should have expanded and ruptured due to osmotic pressure
• the net flow of water should be into the cell

Question 26

LAB During lab you examined a solution of barium hydroxide which has a gas produced by a fermenting yest culture passed through it. Examine the list below and select the correct answer with reference to this demonstration and the reactions involved

Answer 26

The gas produced was CO2 as indicated by the white precipitate produced

Question 27

LAB Read the following statements with regard to the respiration experiment of flour beetles and germinating seeds in Lab 4 select best answer

Answer 27

• The controle tube allows us to account for changes in the air pressure during the experiment
• The KOH abosorbs the Co2 which reduces the amount of gas in the chamber
• The flour beetles at 30c should have the had the highest respiration rate per gm per hr
• the flour beetles and seeds are both Aerobic

Question 28

LAB F slide in a DISSECTING microscope will look like?

Answer 28

F (right side up and normal)

Question 29

LAB F slide in a compound mircoscope will look like?

Answer 29

Upside down and flipped

Question 30

Which of the following would you think are polar molecules based on their inability to mix with oil?

Answer 30

Ether and Soap

Question 31

LAB which of the following is an advantage of the dissecting microscope?

Answer 31

the optics do not invert images

Question 32

LAB if you add IKI to ethanol at a high pH you would expect a

Answer 32

Yellow precipitate

Question 33

LAB recall the catechol-potatoe experiment you conducted. knowing about how enzymes work which of the following set ups would you expect to have the fastest reaction in terms of turning the solution brown?

Answer 33

Catechol solution and cut potato in 40C

Question 34

In lab you separated the pigments involved in photosynthesis from a chloroplast preparation by means of paper chromatography. which pigment, based on the results, likely has the greatest solubility in the ACETONE PETROLEUM ether as a solvent?

Answer 34

Carotene

Question 35

The bond shown forming below occurs in the production of which class of biological molecules?
h-n-c-c-oh h-n-c-oh
H2O

Answer 35

Proteins

Question 36

During Lab 3 you added distilled water to the slide of flaccid live onion cells. Using that knowledge as background what would you expect to happen if you repeated the expirment but used your cheek cells

Answer 36

The net flow of water should be into the cell

Question 37

You are looking at electron micrographs of the following types of cells:
Human liver
Syingia leaf
Onion root tip
Which of the following would you find in all the micrographs?
chloroplast
mitocondria
nucleus

Answer 37

Mitochondria and nucleus

Question 38

The following items are added to a test tube and heated:
3 ml of bedict’s Solution
1 Ml glucose
what would you expect?

Answer 38

brick red precipitate indicating the presence of a REDUCING sugar