Question 1

Which of the following best defines an organic molecule?

Accepted Answer

A molecule primarily composed of carbon atoms bonded to hydrogen and other elements.

Question 2

Why is carbon considered a versatile building block in biological molecules?

Accepted Answer

Because it can form up to four covalent bonds, allowing for diverse molecular structures.

Question 3

Which property of carbon allows it to form large, complex molecules essential for life?

Accepted Answer

Its ability to form double and triple bonds with other carbon atoms.

Question 4

Carbon skeletons can vary in all of the following ways EXCEPT:

Accepted Answer

Ability to form ionic bonds.

Question 5

Which of the following is NOT a type of isomer described in biological molecules?

Accepted Answer

Radioactive isomers.

Question 6

Estradiol and testosterone are both steroid hormones. Which feature do they share structurally?

Accepted Answer

They both have the same carbon skeleton of four fused rings.

Question 7

How do estradiol and testosterone differ in their functional groups?

Accepted Answer

Estradiol has a hydroxyl group, while testosterone has a ketone group.

Question 8

Which functional group is commonly found in amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$\mathrm{-COOH})$$

Question 9

A molecule with the formula $$\mathrm{C_6H_{12}O_6$}$$ can exist as different isomers. Which property allows these isomers to have distinct biological functions?

Accepted Answer

The arrangement of atoms in space (spatial orientation).

Question 10

Which of the following best describes a geometric (cis-trans) isomer?

Accepted Answer

Isomers that differ in the spatial arrangement around a double bond.

Question 11

Which functional group is most likely to make a molecule more hydrophilic?

Accepted Answer

Hydroxyl group ($$\mathrm{-OH})$$

Question 12

A student is analyzing a molecule and finds it contains both an amino group ($$\mathrm{-NH_2$}) $$and a carboxyl group ($$\mathrm{-COOH}). $$What type of molecule is this most likely to be?

Accepted Answer

An amino acid.

Question 13

Which of the following statements about enantiomers is correct?

Accepted Answer

They are mirror images of each other and can have different biological activities.

Question 14

Which functional group is characteristic of alcohols?

Accepted Answer

Hydroxyl group ($$\mathrm{-OH})$$

Question 15

A molecule contains a phosphate group ($$\mathrm{-PO_4$}). $$Which biological macromolecule is it most likely a part of?

Accepted Answer

Nucleic acid

Question 16

Which of the following is a correct application of the concept of isomerism in pharmaceuticals?

Accepted Answer

Enantiomers of a drug can have drastically different effects, with one being therapeutic and the other potentially harmful.

Question 17

Which of the following best explains why carbon can form such a wide variety of compounds?

Accepted Answer

Carbon can form single, double, and triple covalent bonds with itself and other atoms.

Question 18

A molecule with the formula $$\mathrm{C_2H_6O}$$ can be either ethanol or dimethyl ether. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 19

Which functional group is most likely to be involved in energy transfer reactions in cells?

Accepted Answer

Phosphate group ($$\mathrm{-PO_4$})$$

Question 20

A patient is found to have a genetic mutation that affects the enzyme responsible for converting testosterone to estradiol. Which functional group change is most likely impaired?

Accepted Answer

Conversion of a ketone group to a hydroxyl group.

Study Notes: Carbon Compounds in General Biology

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