Question 1

Which of the following best explains why sucralose (Splenda) tastes sweet but provides no calories when consumed?

Accepted Answer

Sucralose binds to the sweet receptor protein but cannot be metabolized by sucrase due to its altered atomic positions.

Question 2

Which of the following chemical interactions is primarily responsible for the folding of proteins so that hydrophobic side chains are buried in the center?

Accepted Answer

Hydrophobic effect

Question 3

A hydrogen bond typically involves three atoms. Which of the following best describes the arrangement?

Accepted Answer

A hydrogen atom covalently bonded to an electronegative atom (N or O) and attracted to another electronegative atom (N or O).

Question 4

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 5

Given the following carbon compound: $$CH_3CH_2OH ($$ethanol), what is the oxidation state of the carbon atom bonded to the hydroxyl group?

Accepted Answer

$$-2$$

Question 6

Which of the following is NOT a functional group commonly found in biological molecules?

Accepted Answer

Alkene

Question 7

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve sharing a pair of electrons between atoms, while ionic bonds involve the transfer of electrons resulting in oppositely charged ions.

Question 8

Which of the following is a correct rule for assigning oxidation states to carbon in organic compounds?

Accepted Answer

Each bond to a more electronegative atom (such as O, N, or halogen) increases the oxidation state by $$+1.$$

Question 9

Which of the following is a chain isomer of n-pentane ($$CH_3CH_2CH_2CH_2CH_3$$)?

Accepted Answer

2-methylbutane ($$CH_3CH(CH_3$)CH_2CH_3)$$

Question 10

Which of the following best describes the role of van der Waals interactions in biological systems?

Accepted Answer

They allow geckos to adhere to smooth surfaces due to cumulative weak attractions.

Question 11

Which of the following is the correct IUPAC name for the compound $$CH_3CH_2CH_2OH$$?

Accepted Answer

1-propanol

Question 12

Which of the following is a correct statement about the hydrophobic effect?

Accepted Answer

It is the exclusion of non-polar structures from a network of polar structures, driving protein folding.

Question 13

Which of the following is a stereoisomer of L-alanine?

Accepted Answer

D-alanine

Question 14

Which of the following best describes the oxidation state change when methane ($$CH_4) is $$converted to carbon dioxide ($$CO_2$$)?

Accepted Answer

The carbon atom is oxidized from $$-4 to$$ $$+4.$$

Question 15

Which of the following is a correct description of a ketone functional group?

Accepted Answer

A carbonyl group in the interior of a carbon chain

Question 16

Which of the following is true regarding the spatial characteristics of carbon bonds in organic molecules?

Accepted Answer

Carbon forms four bonds arranged in a tetrahedral geometry.

Question 17

Which of the following is a correct statement about redox reactions in metabolism?

Accepted Answer

Catabolism releases energy by moving carbon atoms to a higher oxidation state.

Question 18

Which of the following is a correct example of a functional group isomer?

Accepted Answer

Dimethyl ether ($$CH_3OCH_3) $$and ethanol ($$CH_3CH_2OH)$$

Question 19

Which of the following elements is NOT one of the four most common elements in the human body?

Accepted Answer

Calcium

BioC 3022: Biochemistry Course Syllabus and Policies

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