Question 1

Which property of carbon allows it to form a wide variety of molecular structures in living organisms?

Accepted Answer

Its ability to form four covalent bonds due to four unpaired electrons in its valence shell

Question 2

A carbon atom in methane ($$CH_4) $$forms bonds with four hydrogen atoms. What is the bond angle between any two hydrogen atoms in this molecule?

Accepted Answer

$$109.5^\circ$$

Question 3

Which of the following best explains why hydrocarbons are hydrophobic?

Accepted Answer

They contain many nonpolar carbon-hydrogen bonds

Question 4

Which type of isomerism is responsible for the difference in biological activity between the two forms of ibuprofen?

Accepted Answer

Enantiomerism

Question 5

A molecule with the formula $$C_5H_{12}$$ can exist as pentane or 2-methylbutane. What type of isomers are these?

Accepted Answer

Structural isomers

Question 6

Which functional group is most important for cellular energy transfer, as seen in ATP?

Accepted Answer

Phosphate group

Question 7

If a carbon skeleton contains a double bond, what effect does this have on the geometry of the molecule?

Accepted Answer

It causes the atoms involved in the double bond to lie in the same plane (planar geometry)

Question 8

Which of the following molecules is a hydrocarbon?

Accepted Answer

CH$$_4$$

Question 9

Which functional group can act as a base by accepting a hydrogen ion ($$H^+) in $$aqueous solution?

Accepted Answer

Amino group

Question 10

A molecule contains a carbon atom bonded to four different groups. What property does this carbon atom confer to the molecule?

Accepted Answer

It makes the molecule capable of forming enantiomers

Question 11

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They determine the molecule's chemical reactivity and shape

Question 12

Which functional group is NOT typically found in biological organic molecules?

Accepted Answer

Cyanate group

Question 13

Which of the following statements about ATP is correct?

Accepted Answer

ATP releases energy when it reacts with water to form ADP

Question 14

Which functional group is most likely to be found in proteins and is crucial for maintaining their shape through disulfide bonds?

Accepted Answer

Sulfhydryl group

Question 15

Which of the following is a real-world example of the importance of enantiomers in medicine?

Accepted Answer

Only one enantiomer of albuterol is effective in treating asthma

Question 16

Which of the following best describes the difference between testosterone and estradiol?

Accepted Answer

They have the same carbon skeleton but different chemical groups attached

Question 17

Which of the following is true about the methyl group in biological molecules?

Accepted Answer

It is non-reactive and often serves as a tag on biological molecules

Question 18

Which of the following molecules contains both single and double bonds involving carbon?

Accepted Answer

Urea ($$CO(NH_2$)_2)$$

Question 19

Which of the following statements about carbon skeletons is correct?

Accepted Answer

Carbon skeletons can be straight, branched, or arranged in rings

Question 20

Which functional group, if removed, would most adversely affect the shape of a protein due to loss of disulfide bridges?

Accepted Answer

Sulfhydryl group

Chapter 4: Carbon and the Molecular Diversity of Life – Study Notes

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