Biological Sciences 121 > Lab Practical > Flashcards

Lab Practical Flashcards

(60 cards)

Study These Flashcards
1
Q

What are the 5 steps of the scientific method?

A
  1. Observation
  2. Questions
  3. Hypothesis
  4. Predictions
  5. Testing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Hypothesis

A

A statement that provides a possible explanation for an observation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Prediction

A

A prediction is a guess what might happen based on observation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Independent Variable

A

is the variable that is changed or controlled in a scientific experiment (x-axis)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Dependent Variable

A

It is the variable being tested and measured in a scientific experiment. (y-axis)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the two basic types of microscopes?

A

Light and electron(electromagnentic) microscopes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Magnification of a microscope

A

It makes objects larger

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Resolution of a microscope

A

Is the ability to distinguish fine detail

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The contrast of a microscope

A

It helps make an image easier to see because the contrast is the difference between light and dark areas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Resolving Power

A

Is the ability to distinguish two adjacent points as distinct and separate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Light Microscopes

A

Light microscopes use glass lenses and light. The highest resolution is 0.2 micrometers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Electron Microscopes

A

They use an electron beam focused by magnets to illuminate a specimen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Diffusion

A

is the process of random movement toward a state of equilibrium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does diffusion do?

A
  1. They have molecules from an area of higher concentration to one of lower concentration
  2. can occur in any medium (liquid, solid, gas)
  3. Doesn’t require a semipermeable membrane
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Osmosis

A

The net movement of a solvent across a selective permeable membrane into a region of higher solute concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does osmosis do?

A
  1. Can only occur in liquid
  2. requires a semipermeable membrane
  3. movement seeks to equalize solvent concentration (although it doesn’t achieve it)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are the 3 terms used to compare solute concentrations of 2 solutions separated by a membrane?

A
  1. Hypertonic
  2. Isotonic
  3. Hypotonic
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Hypertonic

A

The solution has a higher solute concentration than the other solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Isotonic

A

The solution has an equal solute concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Hypotonic

A

The solution has lower solute concentration than other solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is a selective permeable barrier?

A

It blocks some substances while permits other substances to enter a cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the basic structure of a prokaryotic cell?

A
  1. It has a cell membrane
  2. Lacks membrane-bound organelles
  3. Have nucleoid, where their chromosomes are organized
  4. have circular chromosomes
  5. Have ribosome
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What do all cells have?

A

They all have a plasma membrane, a cytoskeleton, and ribosomes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What do all eukaryotic cell have?

A
  1. They have a nucleus
  2. They have a linear chromosome
  3. They are 10-100 times bigger than prokaryotic cells
  4. They contain membrane bound organelles that perform a certain function
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Catalysts
Are substances that speed up reactions without being permanently altered
26
Enzymes
Are biological catalysts that are mostly protein, except RNA molecules, called ribozymes
27
Substrate
Are reactants that bind to a specific site on the enzyme
28
Active Site
A specific site on the enzyme where the reaction occurs
29
Enzyme-substrate complex (ES)
The binding of a substrate to the active site of an enzyme that are held together by H-bonding, electrical attraction, or temporary covalent bond
30
Substrate concentration affects what?
It affects the rate of an enzyme-catalyzed reaction
31
What affects enzymes speed?
1. Warming increases rates of chemical reactions, but if the temperature is too high, non-covalent bonds can break and inactivate enzymes 2. pH levels
32
Photosynthesis
Is the process of capturing energy from sunlight
33
Light-dependent reactions
Are enzymes that only work in light and convert light energy into chemical energy (in ATP and the reduced electron carrier NADPH)
34
Light-independent reactions
It uses the ATP and NADPH from the light-dependent reaction along with CO2 to produce carbohydrates
35
Light
Is a form of electromagnetic radiation, which travels as a wave but also behaves as particles
36
How many ATP can be made in the Calvin cycle?
54 ATP
37
Cellular Respiration
Is the set of metabaolic reactions used by cells to harvest energy from food. It is a catabolic pathway and glucose is oxidized
38
What is the general equation for photosynthesis?
6CO2 + 6H2O + light energy = 6O2 + carbohydrate
39
Aerobic Metabolism
A set of chemical reactions that releases energy from life's molecule by using O2
40
Anaerobic Metabolism
A set of chemical reactions that extract energy without O2
41
How many ATPs are made during one aerobic respiration?
32 ATPs
42
How many ATPs are created during fermentation?
2 ATPs
43
Anaerobic Fermentation
is the process of energy production in the absence of oxygen.
44
What is Paper chromatography?
It is a method that is used to separate the different pigments involved in photosynthesis
45
What are the two groups of pigments in photosynthetic organisms?
1. Chlorophyll A and B pigment | 2. Carotenoid pigment
46
Carotenoid Pigments
Are accessory pigments that absorbs wavelengths of light between the red and blue wavelengths, and transfer a portion of that energy to the chlorophylls
47
Chlorophyll A
Is the primary pigment of photosynthesis and absorbs orange-red and blue-violet light
48
Chlorophyll B
Is the accessory pigment of photosynthesis and is not necessary for photosynthesis to occur and absorbs blue light
49
Mitosis
ne nucleus produces two daughter nuclei, each containing the same number of chromosomes as the parent nucleus and the products are identical to each other
50
Gene Flow
Migration or mating of individuals between populations that introduces variation
51
Genetic Drift
is a mechanism of evolution in which allele frequencies of a population change over generations due to chance (sampling error). It is faster in smaller population
52
Founder effect
Occurs when new individuals that find a new place to live and colonize (special bottleneck)
53
Population Bottlenecks
occur when a random disaster occurs and a few individuals survives (passes through a narrow neck of a bottle)
54
Allele Frequencies
refers to how common an allele is in a population. It is determined by counting how many times the allele appears in the population then dividing by the total number of copies of the gene.
55
Genotype Frequencies
shows how a population's genetic variation is distributed among its members
56
shows how a population's genetic variation is distributed among its members
Acts to reduce variation without changing the mean value of a trait (birth weight)
57
Directional selection
Acts to shift the mean value of a trait toward one extreme ( Texas Longhorn cattle)
58
Disruptive selection
favors both extremes of trait values, resulting in a bimodal character distribution ( bill size in the black-bellied seedcracker of West Africa.)
59
The genotype of an organism
Is the listing of the two alleles for each trait that it possesses
60
The phenotype of an organism
Is a description of the way a trait is displayed in structure, behavior, or physiology of the organism
Biological Sciences 121
flashcards
Decks in class (20)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions