Lab Quiz 1

Question 1

Hypothesis

Answer 1

A tentative answer to a key question.

Question 2

Dependent Variable

Answer 2

The effect that changes as a result of varying the independent variable.

Question 3

Independent Variable

Answer 3

What the experimenter changes; the cause.

Question 4

Controlled Variable

Answer 4

Identified and kept constant throughout the experiment.

Question 5

Meniscus

Answer 5

The curved surface of water in a cylinder due to surface tension.

Question 6

Taring

Answer 6

Zeroing an instrument to compensate for the mass of something.

Question 7

Mean

Answer 7

The average.

Question 8

Range

Answer 8

The difference between the highest and the lowest data points.

Question 9

Variance

Answer 9

Measures how far each number in the set is away from the mean.

Question 10

Standard Deviation

Answer 10

Summarizes the variability in repetitive measurements.

Question 11

Spectrophotometer

Answer 11

An instrument designed to detect the amount of light energy absorbed by molecules in a solution.

Question 12

Percent Transmittance

Answer 12

A scale from 0 to 100.

Question 13

Absorbance

Answer 13

A scale from 0 to 2.

Question 14

Lambert-Beers Law

Answer 14

For a given concentration range absorbency is directly proportional to the concentration of solute molecules.

Question 15

Standard curve

Answer 15

A graph with known properties used to find an unknown.

Question 16

Significant figures

Answer 16

The number of important single digits in a scientific expression.

Question 17

Line graph

Answer 17

A graph of linear values.

Question 18

Histogram

Answer 18

A bar graph of frequency distribution which is on a horizontal axis.

Question 19

Wavelength

Answer 19

Limits the resolving power of the microscope.

Question 20

Resolution

Answer 20

The capacity of an optical instrument to distinguish two points that are close together.

Question 21

Magnification

Answer 21

Makes things appear larger.

Question 22

Contrast

Answer 22

The gradations of dark to light tone when viewing an image.

Question 23

Working distance

Answer 23

The distance between the slide and objective.

Question 24

Fixing

Answer 24

The use of the fixative to preserve the specimen in biology.

Question 25

Stage

Answer 25

Where the specimen is place for viewing

Question 26

Light source (dissecting microscope)

Answer 26

One projects light from above and another projects light from below the stage.

Question 27

Body

Answer 27

Heavy metal column and parts encasing the lens system of the microscope

Question 28

Ocular lens (dissecting microscope)

Answer 28

The lenses you look through our adjustable for individual differences. May have adjustment ring at its base.

Question 29

Inter pupillary Distance

Answer 29

The distance between the pupils.

Question 30

Objective lenses

Answer 30

Closest the specimen, located in the recesses at the bottom of the body.

Question 31

Magnification control

Answer 31

A knob on the body with magnification capabilities between four times and 50 times.

Question 32

Focusing knob

Answer 32

Turning the knob raises or lowers the body and lens to focus the specimen.

Question 33

Ocular lenses (compound microscope)

Answer 33

Can either be monocular or binocular. Usually a system of several lenses which may have a pointer.

Question 34

Body tube

Answer 34

Hollow housing through which light travels to the ocular.

Question 35

Objective lenses (compound microscope)

Answer 35

Set of three or four lenses mounted on a turret at the bottom of the body tube.

Question 36

Mechanical stage

Answer 36

A gear device for precisely moving the slide.

Question 37

Substage condenser lens

Answer 37

Focuses light on the specimen, located immediately under the stage

Question 38

Diaphragm control

Answer 38

Either annular or iris, adjustable light barrier built into the condenser.

Question 39

Course focus adjustment

Answer 39

Raises or lowers the stage to bring the slide into focus.

Question 40

Find focus adjustment

Answer 40

Changes the specimen to objective distance vary slightly.

Question 41

Focal plane

Answer 41

The plane in which the images and focus.

Question 42

Depth of field

Answer 42

The depth or thickness of an object that is simultaneously and focus.

Question 43

Prokaryotic

Answer 43

Lack nuclear envelope, chromosomal proteins and membranous cytoplasmic organelles. Like bacteria and blue-green algae.

Question 44

Eukaryotic

Answer 44

Have nucleus containing ribosomes in numerous small structures made of membrane inside cells, include; protists, fungi, plants and animals.

Question 45

Vegetative cells

Answer 45

Any cell and a plant or animal that does not participate in reproduction.

Question 46

Akinetes

Answer 46

Thick-walled resting cell found in cyanobacteria and green algae.

Question 47

Heterocysts

Answer 47

A specialized cell that takes part in nitrogen fixation.

Question 48

Cell wall (Fungal)

Answer 48

Made of a polysaccharide polymer called chitin.

Question 49

Cell wall (Plant)

Answer 49

Composed of cellulose and materials not found in fungal cell walls, not in animal cells.

Question 50

Protoplasts

Answer 50

The living cell within a plant cell wall.

Question 51

Chloroplast

Answer 51

Found in the cytoplasm of some protoplasts, carry out the reactions of photosynthesis.

Question 52

Vacuole

Answer 52

Large vesicles found in protoplasts containing water and dissolved materials.

Question 53

Tissues

Answer 53

In aggregate of cells in an organism with similar structure and function.

Question 54

Tonoplast

Answer 54

The cytoplasmic membrane surrounding the vacuole in a cell which separates the vacuum contents from the cytoplasm.

Question 55

Epithelial cells (tissue)

Answer 55

Densely packed cells that sit on the basement membrane and form the coverings or linings of body cavities.

Question 56

Neurons

Answer 56

Nervous system cells primarily designed for communication.

Question 57

Axon

Answer 57

The output end of a neuron.

Question 58

Dendrite

Answer 58

The input end of a neuron.

Question 59

Ligand

Answer 59

A chemical produced by the body to activate a receptor in the body.

Question 60

Agonist

Answer 60

A chemical outside of the body that also activates the receptor.

Question 61

Antagonist

Answer 61

Binds to the receptor but doesn't activate it, but prevents the ligand from activating.