Biology 1020 LAB Flashcards
Chromosomes first become visible during which phase of mitosis?
Prophase
If there are 20 chromotids how many centromeres are there?
10 (one centermere per chromatid pair
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?
Metaphase
graph G1 is represented by which numers
I and V??
graph in the figure which number represents mitosis
IV
Cytokinesis usually, but not always follows mitosis. If a cell completed mitosis but not cystokinesis, the result would be a cell with
two nuclei
Cells that are in a non dividing state are in which phase?
G0
If mammalian cells recieve a go-ahead signal at the G1 check point, they will
Complete the cycle and divide
Which of the following is a requirement for the FIRST check point of the cell cycle after mitosis?
Enough Nutrients are present to sustain 2 daughters
Which of the following statements about Binary fission is true
Process is similar to the replication of mitchondria
LAB a dialysis sac conataining 2% sucrose solution is placed in a beaker containing 2% sucrose solution. which of the following is true?
An aproximetley equal amount of water will move into the sac as will move out of the sac
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?
This cell could be an animal cell because it has a membrane.
LABDuring Lab three you added distilled water to a slide of flaccid live onion cells. which statements re true
the water had a lower concentration of solutes than the onion cell and
the net water flow was out of the cell
LABThe following items are added to a test tube and heated:
3ml of benedicts
1ml sucrose
which would you expect
No reaction
LABOne of the two yeast cultures you performed the iodoform test on produced alcohol. this production of alcohol involved which of the following steps?
Two of the above are correct! WHICH TWO??
LABIn the respirometer experiment with the Tenebrio Larvae, what were you measruing by means of injecting air in the control tube with the syringe?
The change in gas volume due to air pressure or temperature changes
LABIdentify the top pigment
carotene
LABexamine the chloroplast below. at which location would you expect to find photosynthetic pigments involved in capturing light
c
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
None of the above
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
At the end of the cytoplasm of the cell is isotonic
LAB You are examining a cell with an electron microscope and you see the following structures:
Membrane bound nucleus
MitoChrondia
Which is FALSE?
This cell would be a plant cell because it has a mitochondria
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?
D (the circle that is over lapped with another FIND NAMES
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
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
One of the two yeast cultures you performed the iodoform test on produced alcohol. this production of alcohol involved which of the following steps?
E) two of the above are correct (fermentation and glycolysis)
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
- The cheek cells should have expanded and ruptured due to osmotic pressure
- the net flow of water should be into the cell
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
The gas produced was CO2 as indicated by the white precipitate produced
LAB Read the following statements with regard to the respiration experiment of flour beetles and germinating seeds in Lab 4 select best answer
- 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
LAB F slide in a DISSECTING microscope will look like?
F (right side up and normal)
LAB F slide in a compound mircoscope will look like?
Upside down and flipped
Which of the following would you think are polar molecules based on their inability to mix with oil?
Ether and Soap
LAB which of the following is an advantage of the dissecting microscope?
the optics do not invert images
LAB if you add IKI to ethanol at a high pH you would expect a
Yellow precipitate
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?
Catechol solution and cut potato in 40C
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?
Carotene
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
Proteins
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
The net flow of water should be into the cell
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
Mitochondria and nucleus
The following items are added to a test tube and heated:
3 ml of bedict’s Solution
1 Ml glucose
what would you expect?
brick red precipitate indicating the presence of a REDUCING sugar
