Lab II Exam Flashcards
What are the three things that happens in Interphase?
- G1-Growth
- S-DNA Synthesis
- G2-Growth organelle replication prepares to divide
Prophase
Centrosomes duplicate/ begin moving apart. Chromosomes condense and become visible.
Metaphase
Nucleus vanishes. Chromsomes line up in middle of cell. Centrosomes send out spindle fibers.
Anaphase
Spindle shortens-chromosomes pulled towards opposite poles for cells.
Telophase
Nuclei begin to re-form. Chromosomes begins to disappear. Chromatin form 2 identical cells.
How many phases are there?
5: Interphase, Prophase, Metephase, Anaphase & Telophase
Define Diffusion?
is a process that allows ions or molecules to move from where they are more concentrated to where they are less concentrated.
Prediction- Increase salt concentration will increase rate of diffusion in water?
Result- Steeper concentration gradient increase rate of diffusion
Prediction- Rate of diffusion of salt reduces when in sugar water?
Result- Different molecules do not impact rate of diffusion.
Things that affects enzyme activity?
Temperture, pH, presence of salt, amount and type of nutrients available, and the presence of absence of oxygen.
Micrococcus Luteus
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.
Streptococcus Salivarius
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.
Different levels of bacteria growth
- = no growth \+ = little growth \++ = moderate growth \+++ = heavy growth
Qualitative Assessment
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.
Stectrophotometer
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
Quantitative Assessment
which is a number that can be put on observation, allowing for statistical test to be performed.
How did we know that the amylase concentration was too high?
We knew the amylase concentration was to high we knew that how fast it broke down.
How do we know if starch is present?
By doing the Iodine Reactant test
How do we know if Glucose is present?
By doing the Benedict’s Reaction test
