Question 1

Which scientist is credited with the initial discovery of the antibiotic action of penicillin?

Accepted Answer

Alexander Fleming

Question 2

What unique chemical feature is present in all penicillin antibiotics?

Accepted Answer

A beta-lactam ring

Question 3

Penicillin inactivates which key bacterial enzyme, leading to cell wall disruption?

Accepted Answer

Transpeptidase (PBP)

Question 4

Bacteria defend themselves against penicillin antibiotics by producing which enzyme?

Accepted Answer

Beta-lactamase

Question 5

Which quantum number determines the size and number of nodes in an atomic orbital?

Accepted Answer

Principle quantum number ($n$)

Question 6

How many radial nodes does a 3s orbital have?

Accepted Answer

2

Question 7

What is the formula for calculating the number of radial nodes in an atomic orbital?

Accepted Answer

$n - l - 1$

Question 8

Which atomic orbital is characterized by a dumbbell shape and one angular node?

Accepted Answer

2p

Question 9

What is the electron configuration for carbon (C)?

Accepted Answer

$1s^2 2s^2 2p^2$

Question 10

Which rule states that electrons fill orbitals of equal energy singly before pairing up?

Accepted Answer

Hund's Rule

Question 11

A bacterial cell wall is composed of aminoglycan polymers cross-linked with what?

Accepted Answer

Oligopeptides

Question 12

What happens to a bacterium when its cell wall is not cross-linked due to penicillin action?

Accepted Answer

It undergoes osmolysis and dies

Question 13

Which quantum number determines the spatial orientation of an atomic orbital?

Accepted Answer

Magnetic quantum number ($m_l$)

Question 14

Which of the following is a beta-lactamase inhibitor often co-prescribed with penicillin?

Accepted Answer

Clavulanic acid

Question 15

What is the shape of a 3d orbital?

Accepted Answer

Clover leaf

Question 16

Which principle states that only two electrons with opposite spins can occupy an orbital?

Accepted Answer

Pauli Exclusion Principle

Question 17

If an atom has a principle quantum number $n = 3$ and angular momentum quantum number $l = 1$, what is the subshell?

Accepted Answer

3p

Question 18

Which of the following best describes the electron probability density plot for a 1s orbital?

Accepted Answer

A spherical distribution with no nodes

Question 19

What is the main function of the valence electrons in an atom?

Accepted Answer

They participate in chemical bonding and reactions

Question 20

Which of the following statements about electrons is correct according to modern chemistry?

Accepted Answer

Electrons are neither waves nor particles, but can be modeled as both

Atomic and Molecular Structure: Foundations for Organic Chemistry

Study Guide - Practice Questions