Jmu Bio 140 Lab Check Point 2 Questions With Correct Answers

Why is it important to post-rinse when pipetting volumes less than 20 microliters? CORRECT ANSWER Small volumes may not get expelled completely due to surface tension. True/False: Pipettors are most accurate in the middle to top end of their volume range. CORRECT ANSWER true How can contamination be prevented in the laboratory? CORRECT ANSWER -using barrier pipette tips -changing pipette tips between solutions -keeping test tubes and pipette tip boxes closed What unit is pipetteing done in? CORRECT ANSWER microliter (uL) How many liters are in a micro liter? CORRECT ANSWER 10^-6 L How do you convert milliliters to microliters? CORRECT ANSWER move decimal three times to the right Define biodiversity CORRECT ANSWER increases as more tips and branches are added to the tree of life Define species richess CORRECT ANSWER number of species found in an area Define Shannon diversity CORRECT ANSWER measure of biodiversity which accounts for species richness and evenness Define species abundance CORRECT ANSWER the total number of individuals of each species What are the major threats to biodiversity? CORRECT ANSWER -mass extinction event -habitat destruction and degragation -habitat framentation Define fragmentation CORRECT ANSWER the splitting of contiguous areas of natural habitats into small. isolated fragments Why are transects used? CORRECT ANSWER to control the size of a sample area What are the three basic steps of a PCR reaction? CORRECT ANSWER -denaturing -annealing -extension