Q: Which of the following is a correct example of an anabolic reaction involving carbohydrates?

$$\text{Glucose} + \text{Glucose} \rightarrow \text{Maltose} + \text{H}_2\text{O}$$

Question 1

Which of the following correctly describes the scientific name for the yeast commonly used in baking, and the taxonomic levels used in binomial nomenclature?

Accepted Answer

Saccharomyces cerevisiae; Genus and Species

Question 2

Which of the following is a key structural difference between the plasma membranes of Bacteria and Archaea?

Accepted Answer

Bacterial membranes contain ester-linked phospholipids, while archaeal membranes contain ether-linked phospholipids.

Question 3

A patient presents with a chronic cough and is suspected of having tuberculosis. Which staining technique and dye would be most appropriate to identify the causative agent, and what is the main component of its cell wall?

Accepted Answer

Acid-fast stain using auramine O; mycolic acid

Question 4

Which of the following best describes the difference between molds and yeasts?

Accepted Answer

Molds are multicellular and reproduce by forming spores, while yeasts are unicellular and reproduce by budding.

Question 5

Which of the following is a correct example of an anabolic reaction involving carbohydrates?

Accepted Answer

$$	ext{Glucose} + 	ext{Glucose} ightarrow 	ext{Maltose} + 	ext{H}_2	ext{O}$$

Question 6

Which of the following statements about the Gram stain is correct?

Accepted Answer

Gram-positive bacteria retain the crystal violet-iodine complex and appear purple, while Gram-negative bacteria lose the complex and appear pink after counterstaining.

Question 7

Which of the following best explains why immersion oil is used with the 100x objective lens in light microscopy?

Accepted Answer

It increases the numerical aperture by reducing light refraction, improving resolution.

Question 8

Which of the following is a function of the bacterial glycocalyx, and what are its two main forms?

Accepted Answer

Protection against desiccation; capsule and slime layer

Question 9

Which of the following best describes the difference between a triglyceride and a phospholipid?

Accepted Answer

A triglyceride has three fatty acids attached to glycerol, while a phospholipid has two fatty acids and a phosphate group attached to glycerol.

Question 10

Which of the following is a correct pairing of a bacterial genus with its typical location in the human microbiome?

Accepted Answer

Bacteroides – intestines

Question 11

Which of the following scientists is correctly matched with their contribution to microbiology?

Accepted Answer

Louis Pasteur – disproved spontaneous generation and developed pasteurization

Question 12

Which of the following best describes the difference between psychrophile and thermophile membranes?

Accepted Answer

Psychrophile membranes have more unsaturated fatty acids, while thermophile membranes have more saturated fatty acids.

Question 13

Which of the following is a correct example of a monosaccharide and its function?

Accepted Answer

Glucose – primary energy source for cells

Question 14

Which of the following best describes the role of the condenser in a light microscope?

Accepted Answer

It focuses light onto the specimen to improve illumination.

Question 15

Which of the following is a correct description of the function of bacterial flagella and fimbriae?

Accepted Answer

Flagella are used for motility, while fimbriae are used for attachment to surfaces.

Question 16

Which of the following best explains why electron microscopy is required to visualize bacteriophages?

Accepted Answer

Bacteriophages are smaller than the resolution limit of light microscopes, which is approximately $$0.2\ \mu	ext{m}.$$

Question 17

Which of the following is a correct example of a catabolic reaction involving carbohydrates?

Accepted Answer

$$	ext{Glycogen} ightarrow 	ext{Glucose}$$

Question 18

Which of the following best describes the difference between organic and inorganic compounds?

Accepted Answer

Organic compounds contain carbon-hydrogen bonds, while inorganic compounds generally do not.

Question 19

Which of the following is a correct description of the levels of protein structure and the bonds involved?

Accepted Answer

Primary structure: peptide bonds; Secondary structure: hydrogen bonds; Tertiary structure: disulfide, ionic, and hydrophobic interactions; Quaternary structure: interactions between polypeptide subunits

Question 20

A bacterial cell is placed in a hypertonic environment. Which type of cell wall structure is more likely to help the cell survive, and why?

Accepted Answer

Gram-positive cell wall, because its thick peptidoglycan layer provides better protection against dehydration.

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