Lab II Exam

Question 1

What are the three things that happens in Interphase?

Answer 1

1. G1-Growth
2. S-DNA Synthesis
3. G2-Growth organelle replication prepares to divide

Question 2

Prophase

Answer 2

Centrosomes duplicate/ begin moving apart. Chromosomes condense and become visible.

Question 3

Metaphase

Answer 3

Nucleus vanishes. Chromsomes line up in middle of cell. Centrosomes send out spindle fibers.

Question 4

Anaphase

Answer 4

Spindle shortens-chromosomes pulled towards opposite poles for cells.

Question 5

Telophase

Answer 5

Nuclei begin to re-form. Chromosomes begins to disappear. Chromatin form 2 identical cells.

Question 6

How many phases are there?

Answer 6

5: Interphase, Prophase, Metephase, Anaphase & Telophase

Question 7

Define Diffusion?

Answer 7

is a process that allows ions or molecules to move from where they are more concentrated to where they are less concentrated.

Question 8

Prediction- Increase salt concentration will increase rate of diffusion in water?

Answer 8

Result- Steeper concentration gradient increase rate of diffusion

Question 9

Prediction- Rate of diffusion of salt reduces when in sugar water?

Answer 9

Result- Different molecules do not impact rate of diffusion.

Question 10

Things that affects enzyme activity?

Answer 10

Temperture, pH, presence of salt, amount and type of nutrients available, and the presence of absence of oxygen.

Question 11

Micrococcus Luteus

Answer 11

This organism is a common inhabitant of human skin, which contains a high salt concentration relative to many other environment. While this organism is not generally considered pathogenic, some infections have been attributed to this organism in the literature.

Question 12

Streptococcus Salivarius

Answer 12

This bacterium is a primary inhabitant of the human oral cavity, and while not commonly associated with disease, this species can produce a glycocalyx and stick to teeth, initiating the formation of plaque.

Question 13

Different levels of bacteria growth

Answer 13

- = no growth 
\+ = little growth
\++ = moderate growth 
\+++ = heavy growth

Question 14

Qualitative Assessment

Answer 14

it gives you the idea of how much growth has occurred, but cannot place a number on the growth or do any statistical tests on the data.

Question 15

Stectrophotometer

Answer 15

this is an instrument that shines light through a solution, and measures how much light passes through the solution and how much is absorbed or scattered by the solution

Question 16

Quantitative Assessment

Answer 16

which is a number that can be put on observation, allowing for statistical test to be performed.

Question 17

How did we know that the amylase concentration was too high?

Answer 17

We knew the amylase concentration was to high we knew that how fast it broke down.

Question 18

How do we know if starch is present?

Answer 18

By doing the Iodine Reactant test

Question 19

How do we know if Glucose is present?

Answer 19

By doing the Benedict’s Reaction test