Lab Quiz 1

Question 1

Discovery-based Science

Answer 1

approach were observations of nature are record as data sets that may be qualitative or quantitative

use methods of science: curiosity, careful observation, accurate recording, meticulous descriptions that would allow others to repeat the work to test its accuracy

seek the “what,” “where,” “when” type of questions

Question 2

Hypothesis-based Science

Answer 2

starts with observations but goes on to test proposed answers to the “how” and “why” questions

Question 3

Science is based on three fundamental ideas

Answer 3

1) principle of universal causality: replicated, identical results can be obtained
2) principle of uniformity in nature: future will resemble the past
3) law of parsimony: the simplest explanation with the fewest modifying statements is the best

Question 4

Hypothesis

Answer 4

a tentative answer to a key question

has to be

1) falsifiable
2) testable

Question 5

Qualitative Data

Answer 5

describe something without numbers

Question 6

Quantitative Data

Answer 6

describe something with numbers

Question 7

independent variable

Answer 7

what the experiment changes; its the cause

Question 8

dependent variable

Answer 8

the effect

should change as a result of varying the independent variable

Question 9

control variables

Answer 9

kept constant throughout the experiment

Question 10

1mL =

Answer 10

1000 microliters

or
0.5mL = 500 microliters

Question 11

Micropipette

Answer 11

pipette small amounts

-controls air flow

Question 12

Macropipette

Answer 12

move volumes greater than 1mL

-run on pressure

Question 13

Accurate

Answer 13

how close the measurement is to the true value

Question 14

Precise

Answer 14

refers to exactness and reproducibility

Question 15

Calibration

Answer 15

adjusting the device or correcting the measured value to match the true value as closely as possible

Question 16

Parallax

Answer 16

occurs when reading an instrument that has a scale and pointer that are not aligned perpendicular to your eyes

Question 17

Spectrophotometry

Answer 17

a method used to identify and quantify colored solutions based on their light absorbing properties

Question 18

5 basic parts of a spectrophotometer

Answer 18

1) light source
2) diffraction grating
3) slit
4) detector
5) readout

Question 19

6 type of protist

Answer 19

1) Stentor
2) Volvox: circular, pointed
3) Paramecium: cilia, oval
4) Euglena: flagella, pointed
5) Amoeba: movement inside, “blob with many arms”
6) Spirogyra: long, “stem-like”

Question 20

2 types of cyanobacteria

Answer 20

1) Anabaena

2) Gloeocapsa

Question 21

Vasoconstriction

Answer 21

blood flow increase

reduce surface area

Question 22

Vasodilation

Answer 22

blood flow decreases

increase surface area