Q: Which equation correctly represents the calculation of total magnification when using a compound microscope?

Total magnification $$= \text{Objective lens magnification} \times \text{Ocular lens magnification}$$

Q: Which equation correctly represents the relationship between pH and hydrogen ion concentration?

$$\text{pH} = -\log_{10}[\text{H}^+]$$

Question 1

Which of the following best describes the endosymbiotic theory?

Accepted Answer

It proposes that eukaryotic cells evolved from prokaryotic cells through the engulfment of smaller prokaryotes, which became organelles such as mitochondria and chloroplasts.

Question 2

Which scientist is credited with disproving the hypothesis of spontaneous generation using a swan-neck flask experiment?

Accepted Answer

Louis Pasteur

Question 3

A patient develops an infection after surgery that was not present before admission. What is the term for this type of infection?

Accepted Answer

Nosocomial infection

Question 4

Which scientist developed the system of binomial nomenclature for classifying organisms?

Accepted Answer

Carlolus (Carl) Linnaeus

Question 5

Which of the following best describes a mutualistic symbiotic relationship?

Accepted Answer

Both organisms benefit from the interaction.

Question 6

What is the main function of bacterial capsules?

Accepted Answer

To protect bacteria from phagocytosis and help them adhere to surfaces.

Question 7

Which equation correctly represents the calculation of total magnification when using a compound microscope?

Accepted Answer

Total magnification $$= 	ext{Objective lens magnification} 	imes 	ext{Ocular lens magnification}$$

Question 8

Which of the following is a function of enzymes in chemical reactions?

Accepted Answer

They act as catalysts to lower the activation energy and speed up reactions.

Question 9

Which scientist discovered penicillin, the first antibiotic?

Accepted Answer

Alexander Fleming

Question 10

Which of the following statements about Gram staining is correct?

Accepted Answer

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

Question 11

Which molecule is considered the energy currency of the cell?

Accepted Answer

ATP (adenosine triphosphate)

Question 12

Which scientist established criteria for determining the etiological agent of infectious disease, known as 'postulates'?

Accepted Answer

Robert Koch

Question 13

Which of the following is a property of facilitated diffusion?

Accepted Answer

It is a passive process that requires a membrane protein to transport molecules across the membrane.

Question 14

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 15

Which equation correctly represents the relationship between pH and hydrogen ion concentration?

Accepted Answer

$$	ext{pH} = -\log_{10}[	ext{H}^+]$$

Question 16

Which of the following best describes a frameshift mutation?

Accepted Answer

A mutation caused by insertion or deletion of nucleotides that alters the reading frame of the genetic code.

Question 17

Which scientist's work was critical in understanding the structure of DNA through X-ray crystallography?

Accepted Answer

Rosalind Franklin

Question 18

Which process is used by bacteria to communicate and coordinate behavior based on population density?

Accepted Answer

Quorum sensing

Question 19

Which equation represents dehydration synthesis, where two monomers join and release water?

Accepted Answer

$$	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + 	ext{H}_2	ext{O}$$

Question 20

Which scientist co-developed the CRISPR-Cas9 gene editing technology?

Accepted Answer

Emmanuelle Charpentier & Jennifer Doudna

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