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Portage Learning CHEM 210 exams 1-8 and

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Question 1 3 / 3 pts

True or False: According to the Module, a compound with a molecular mass of 1,000 g/mol is considered a macromolecule.

True Correct!

False

Question 2 3 / 3 pts True or False: Biomolecules can have only two functional groups.

True Correct!

False

Question 3 3 / 3 pts

True or False: The following functional group is an alcohol.

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True Correct!

False

Question 4 3 / 3 pts

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True or False: In a eukaryotic cell, the organelles called peroxisomes serve the purpose of digesting macromolecules.

True Correct!

False

Question 5 3 / 3 pts True or False: Carbon dioxide has a linear molecular shape AND has a bond angle of 109.5o.

True Correct!

False

Question 6 3 / 3 pts Of the following, is not a property of carbon.

forming covalent bonds

triple bond formation Correct!

possessing five valence electrons

reacting to form long chains called polymers

forming multiple bonds

Question 7

3 / 3 pts Which of the following is an element not typically found in living organisms?

N

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Correct!

He

H

S

O

Question 8 3 / 3 pts is a functional group found in carbohydrates.

Esters

Thiols

Carboxylic acids Correct!

Alcohols

Amines

Question 9 3 / 3 pts

The following functional group is an example of.

Correct!

Ketone

Thiol

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Amide

Benzene

Aldehyde

Question 10 0 / 3 pts A is a chemical formula that does NOT show the C-H and C-C bonds.

You Answered

Covalent formula

Line bond formula

Empirical formula

Kekule’ structure Correct Answer

Condensed formula

Question 11 3 / 3 pts

A collection of two or more macromolecules uniting is called a.

Correct!

Supramolecular complex

Monomer

Macromolecular structure

Dimer

Kekule’ complex

Question 12 3 / 3 pts An organic compound with this structure, C=C, contains a functional group.

Alkane

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Correct!

Alkene

Alkyne

Alcohol

Both b and d

Question 13 3 / 3 pts Scientists refer to as the “super glue” of the chemistry. Correct!

C

Co

Na

N

O

Question 14 3 / 3 pts What molecule is most important for energy storage in cells?

Creatine

mitochondria

DNA

RNA Correct!

ATP

Question 15 3 / 3 pts

What would be the approximate size of a human cell?

a. 12 μ m

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b. 1 nm c. 15 nm d. 0.2 inch e. 15 cm

Correct!

a.

b.

c.

d.

e.

Question 16 3 / 3 pts For propane, there carbon and hydrogen atoms.

5, 12

4, 10 Correct!

3, 8

3, 6

None of the above

Question 17 3 / 3 pts For an organic compound, which structure is the most efficient to draw? Correct!

Line bond

Condensed

Lewis structure

Structural formula

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None of these

Question 18 3 / 3 pts When writing an organic functional group, scientists often write an “R” as part of the structure. What does the R indicate?

A string of carbon atoms

Radon

Routine carbon atom Correct!

Rest of the molecule

None of the above

Question 19 3 / 3 pts

According to the module, the study of NON-carbon compounds is referred.

Organic chemistry Correct!

Inorganic chemistry

Biochemistry

Environmental chemistry

None of the above.

Question 20 3 / 3 pts Which of the following is not a functional group discussed in this module?

Alcohol

Amine

Ketone

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Aldehyde Correct!

All of these were discussed.

Question 21 3 / 3 pts Which number would be closest to the approximate number of ribosomes in an E. coli cell?

A. 1

B. 25

C. 250

Correct!

D. 25,

E. Both c and d

Question 22 0 / 3 pts Which of the following would most likely have a cell wall? Correct Answer

Marigold flower cells

Deer cells

Heart cells

Human red blood cells You Answered

All of the above

Question 23 0 / 3 pts

Eukaryotes have molecules that provide protective structural. This network is called the .

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Cell wall You Answered

Cytoplasm

Cytosol Correct Answer

Cytoskeleton

Both Cell wall and Cytoskeleton

Question 24 3 / 3 pts The molecule linked to the medical condition of gout is. Correct!

Uric acid

Luciferin

Luciferase

Glucose

Glycine

Question 25 3 / 3 pts

About how many different elements are found in living organisms?

Correct!

30

50

68

92

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Question 26 3 / 5 pts (Short response) Explain the common similarity in all prokaryotic and eukaryotic cells. Give a brief explanation of the similarity. Your Answer:

The common similarity between prokaryotic and eukaryotic cells are they both contain cells, a cell membrane and ribosomes.

The fundamental similarity is that each cell type has a plasma membrane that separates life from non-life. The plasma membrane acts as a barrier to most molecules but does have proteins that permit select molecules to cross via proteins (transporters). The plasma membrane permits the cell to have a different composition of molecules inside the cell than out and defines a space for life to occur.

Develop the membrane response further, based on module material.

Question 27 2.5 / 5 pts (Short response) Would scientists be more likely to find an element such as O in a biomolecule, or W? Explain which she would more likely find in biological molecule and give specific physical/chemical properties. Your Answer:

Scientists would be more likely to find an element of O in a biomolecule because O is a bulk element while W is a trace element. O is found is most strcutures and functional groups.

She would more likely find O. Smaller elements are preferred. In the case of O, it is found in water, so it would be highly concentrated. Smaller elements with smaller atomic shells are favored because they can form stable covalent bonds. Strong bonds form by significant overlap of atoms, such as carbon and hydrogen permitting them to share electrons. The bond that forms requires a substantial amount of energy to break, which allows the bonds to withstand insults, such as mechanical and thermal stresses. This bond strength is good news for living organisms. Stable bonds allow cells to form, hair to grow, and skin to protect against abrasion.

Larger elements, such as W, tend to form ionic compounds–not covalent.

Describe why O is using the size/overlap.

Question 28 3.5 / 5 pts (Short response) What element is the basis for life? Describe at least two properties of this

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element that permit it to serve the basis for life. Your Answer:

Carbon is the element that is the basis for life. Carbon has the ability to form stable covalent bonds and unique combinations. Carbon has its own branch organic chemistry.

1. Carbon can form strong covalent bonds with a variety of different elements. 2. Besides, carbon can form double and triple bonds with other carbon atoms and other elements (N and o). 3. Carbon can form long chains by forming numerous carbon-carbon bonds; we

call these large molecules polymer. 4. Lastly, carbon can form cyclic structures, which are also called ring compounds.

Give one more property of carbon.

Question 29 4 / 5 pts (Short response) How does organic chemistry differ from inorganic chemistry? Your Answer:

Organic chemistry is focues on the chemical and physical properties of carbon and inorganic chemistry focues on non organic compounds.

Organic chemistry is the study of the carbon-based compounds. Inorganic chemistry is the study of all other elements, but carbon. There is no need to have separate sub-disciples for organic and inorganic chemistry, but for historical and organizational reasons the difference exists.

Include the non-carbon elements in your defintion of inorganic.

Question 30 0 / 5 pts (Short response) Biochemists study the communication within and among organisms. According to the module, what are two other aspects of living organisms that biochemists study? Your Answer:

Bichemists study carbs and proteins in living organism along with chemistry and biology. Also luciferin i studies and luciferase.

In the module, biochemists also study the structure and function of biomolecules and the chemical reactions of organisms.

Be more specific here. This is related to the homework problems and module material.

EXAM 2

Question 1

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3 / 3 pts

The pH of a solution of 0.0010 M NaOH is:

Correct!

11

[Kw=[H+][OH-] = 1.0 x 10-14; [H+][0.0010] = 1.0 x 10-14^ [H+]=1.0 x 10-11;

pH=-log[1.0 x 10-11;]=11]

0

Question 2 3 / 3 pts Water is a unique molecule. Which of the following contributes to water’s unique place in the chemical world?

The geometry of the molecule

The polarity of the O-H bonds

The ability of water molecules to hydrogen bond

The bond angle of water Correct!

All of the answers are correct

Question 3 0 / 3 pts

The bent shape of water is due to.

The dipole arrows in a water molecule