Question 1

Which of the following is NOT considered a microbial organism?

Accepted Answer

Plants

Question 2

Which macromolecule category is primarily responsible for storing genetic information in cells?

Accepted Answer

Nucleic acids

Question 3

A student is studying a molecule with the following structure: $\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$. Which class of macromolecules does this molecule belong to?

Accepted Answer

Carbohydrates

Question 4

Which of the following statements about DNA is correct?

Accepted Answer

DNA is a long polymer of nucleotides that stores genetic instructions

Question 5

Which process describes the flow of genetic information from DNA to protein?

Accepted Answer

Central Dogma: Transcription followed by Translation

Question 6

A mutation changes an adenine (A) base in DNA to a cytosine (C). Which type of macromolecule is directly affected by this change?

Accepted Answer

Nucleic acid

Question 7

Which of the following is a function of the cytoplasmic membrane in microbial cells?

Accepted Answer

Acting as a selective barrier to water-soluble molecules

Question 8

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

They translate the genetic code into protein

Question 9

Which of the following elements is NOT a major component of biological macromolecules?

Accepted Answer

Calcium

Question 10

A scientist isolates a molecule with a carboxyl group ($\mathrm{-COOH}$), an amino group ($\mathrm{-NH_2}$), and a unique R group. What type of molecule is this?

Accepted Answer

Amino acid

Question 11

Which of the following is TRUE about the structure of DNA?

Accepted Answer

It forms a double helix stabilized by base stacking and hydrogen bonds

Question 12

Which macromolecule is most directly involved in catalyzing metabolic reactions in the cytoplasm?

Accepted Answer

Proteins (enzymes)

Question 13

Which of the following is a property shared by all living organisms?

Accepted Answer

Metabolism

Question 14

A patient is diagnosed with a disease caused by a eukaryotic microorganism that lacks chlorophyll and absorbs nutrients from its environment. Which type of organism is most likely responsible?

Accepted Answer

Fungi

Question 15

Which of the following best explains why phospholipids are essential for cell membranes?

Accepted Answer

They form a bilayer that acts as a barrier to water-soluble molecules

Question 16

During DNA replication, which base pairs with guanine (G)?

Accepted Answer

Cytosine (C)

Question 17

Which of the following is a correct sequence for the central dogma of molecular biology?

Accepted Answer

DNA $\rightarrow$ RNA $\rightarrow$ Protein

Question 18

A researcher finds a cell with a network of proteins that provides structural support and organizes its contents. What is this network called?

Accepted Answer

Cytoskeleton

Question 19

Which of the following is a function of the cytoplasm in microbial cells?

Accepted Answer

Site of metabolic activities such as protein synthesis and energy release

Question 20

Which of the following is TRUE about the genome of a bacterial cell?

Accepted Answer

It is usually a single circular DNA molecule

Fundamentals of Microbial Cell Structure and Macromolecules

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