Bio Lab Quiz review

True or False: In science, the terms "theory" and " hypothesis" are used interchangeably.

False

True or False: Scientific claims found in newspapers and online media are always reliable.

False

True or False: The Scientific Method is a linear process.

False

What type of chemical bond involves two atoms sharing electrons ? hydrogen none of the above ionic covalent

covalent

True or False: A scientific experiment can have multiple independent variables ?

False

Match the following definitions with their terms: 1. Closeness of two or more measurements to each other. 2. Closeness of a measured value to a standard or know value. 3. Familiar and useful measure of the average. 4. Middle observation in a set of observations which have been ranked. 5. Observation that occurs most frequently. Median Precision Mode Accuracy Mean

1: Precision 2: Accuracy 3: Mean 4: Median 5: Mode

How many covalent bonds does carbon (C) usually form? 4 2 3 1

4

Based on the assumptions and approaches inherent to modern scientific methodology, which of the following statements can NOT be investigated scientifically? Acid rain increases mortality in trees Ethanol has a lower boiling point than water A supernatural Creator spoke the natural world into existence about 6000 years ago Malaria is caused by a microorganism transmitted by mosquitoes

A supernatural Creator spoke the natural world into existence about 6000 years ago

Which reagent is used to test for the presence of simple sugars? Biuret Reagent Lugol's Iodine Benedict's Reagent Sudan IV stain

Benedict's Reagent

In our Lab 3: Biochemistry, apple juice represented the known for which macromolecules? Lipids Carbohydrates (simple sugars) Polysaccharides (starch) Proteins

Carbohydrates (simple sugars)

Which macromolecules did we test for in Lab 3? Select all that apply. Carbohydrates (simple sugars) Polysaccharides (starch) Nucleic Acids Lipids Proteins Chitin

Carbohydrates (simple sugars) Polysaccharides (starch) Lipids Proteins

What is the independent variable in this experiment? manufacturer cost mg of ibuprofen per tablet type of machine

Cost

What color is present for a positive test for starch using Lugol's Iodine? Light Orange Pale Blue Pale Purple Dark Purple/Black

Dark Purple/Black

Which of the following are parts of a typical scientific paper? Select all that apply. Techniques Discussion Materials/Methods Literature Cited Resources Results Introduction Colleagues Abstract

Discussion Materials/Methods Literature Cited Results Introduction Abstract

Which of the following is NOT a step in the Scientific Method? Hypothesis Analysis Question Discussion with peers

Discussion with peers

When two monomers react to form a polymer, what type of molecule is typically released? H20 CO2 O2 C6H12O6

H2O

Match the following terms with their definitions: Tentative answer usually leading to predictions: A procedure performed to gather data: An extremely strong statement that provides an explanation of a natural phenomenon based on a wealth of well-documented evidence: Summarizes and presents the data so that trends or patterns can be observed: Statement regarding whether or not the hypothesis is supported: Analysis Theory Hypothesis Experiment Conclusion

Hypothesis Experiment Theory Analysis Conclusion

A refrigerator thermometer is read ten times and registers degrees Celsius as: 39.1, 39.4, 39.1, 39.2, 39.1, 39.2, 39.1, 39.1, 39.4, and 39.1. However, the real temperature inside the refrigerator is 37.0 degrees C. What can you tell about the refrigerator thermometer? It is accurate, but not precise. It is neither accurate nor precise. It is both accurate and precise. It is precise, but not accurate.

It is precise, but not accurate.

One of the first steps in the Scientific Method, something anyone can do regardless of equipment, is... Analyze Results Draw a conclusion Test Hypothesis Make an observation

Make an observation

A pharmaceutical company has just purchased a new machine to produce 200-mg ibuprofen tablets. Before getting rid of their older machine, they carry out an experiment to determine if the new machine is as accurate as the older one. Random samples of 10 tablets from each machine are taken and analyzed for ibuprofen content. The raw data and analysis output are as follows: Old Machine: 199.8 199.7 200.0 200.1 199.6 199.9 200.0 200.2 200.7 200.0 New Machine: 199.8 196.4 201.2 201.9 203.3 198.5 203.4 200.4 193.9 202.1

Old Machine: Mean: 200 Minimum: 199.6 Maximum: 200.7 Count: 10 Standard Deviation: 0.305505 P-value: 0.92736 New Machine: Mean: 200.09 Minimum: 193.9 Maximum: 203.4 Count: 10 Standard Deviation: 3.063205

What color is present for a positive test for proteins using Biuret? Pale Purple/Violet Yellow Light Orange Dark Purple/Black

Pale Purple/Violet

You have an object whose weight is known to be exactly 450 g. When weighing the object, the scale you are using reads 445 g ten times in a row. Which of the following statements is correct? The scale is both accurate and precise The scale is accurate but not precise The scale is precise but not accurate The scale is neither accurate nor precise

The scale is precise but not accurate

T/F One indicator of precision is Standard Deviation. True False

True

T/F: Everyone has a bias.

True

Using Means, does the new machine appear to be as accurate as the old machine (at least within a tenth of a milligram)? No Yes

Yes

What are the monomers for a peptide (protein) polymer? amino acids saccharides fatty acids nucleotides

amino acids

A hypothesis or theory must meet all of the following criteria except: be falsifiable be testable by experimentation and observation of the natural world be open to revision and change be accepted by a large number of people

be accepted by a large number of people

If an instrument is precise but not accurate, which of the following would be appropriate? calibrating trashing taring deviating

calibrating

What type of chemical bond involves the transfer of one or more electrons from one atom to another atom? Polar Covalent Hydrogen Ionic

ionic

What does the standard deviation of a sample set represent? represents the middle or centre of its distribution measures the spread of a data distribution brief informational coefficients that summarize a given data set how scattered, spread out or variable a set of data is around some central tendency

measures the spread of a data distribution

What is the scientific term for the dip of the fluid's surface in a graduated cylinder or other narrow tube? meniscus convex crescentoid sickle

meniscus

What is the dependent variable in this experiment? mg of ibuprofen per tablet manufacturer cost type of machine

mg of ibuprofen per tablet

Does the new machine appear to be as precise as the old machine? No Yes

no

Compared to Ethane (CH3CH3) molecules, Water (H2O) molecules..... none of these. slide past each other better. stick together more. drip faster.

stick together more.