Question 1

Which of the following best describes a colony that is very small, dot-like, and scattered across the agar surface?

Accepted Answer

Punctiform

Question 2

A student observes a bacterial colony with a lens-shaped appearance. Which term should be used to describe its form?

Accepted Answer

Spindle

Question 3

Which of the following colony elevations is characterized by a shallow, dome-like profile, but not as deep as pulvinate?

Accepted Answer

Raised

Question 4

If a colony margin is described as 'erose,' what is another term that can be used interchangeably?

Accepted Answer

Serrated

Question 5

A colony that is difficult to remove from a loop due to its sticky consistency is best described as:

Accepted Answer

Viscous

Question 6

Which of the following is NOT a factor that should be included when describing the culture conditions of a colony?

Accepted Answer

Gram stain result

Question 7

A colony that blocks transmitted light when viewed under a dissecting microscope is described as:

Accepted Answer

Opaque

Question 8

Which of the following best describes a colony with a branching structure that distinguishes it from filamentous colonies?

Accepted Answer

Rhizoid

Question 9

A student describes a colony as 'mucoid.' What characteristic is most likely being observed?

Accepted Answer

Large, moist, sticky colonies

Question 10

Which of the following terms describes a colony with a surface that is shiny and reflects light?

Accepted Answer

Glistening

Question 11

A colony with a central raised bump is best described as:

Accepted Answer

Umbonate

Question 12

Which of the following is the most appropriate way to describe a colony that stains the agar with a colored pigment?

Accepted Answer

Diffusible pigment

Question 13

A microbiologist observes a colony with a margin that appears to have deep, finger-like projections. Which term best describes this margin?

Accepted Answer

Lobate

Question 14

Which of the following best describes a colony that is semi-circular in cross-section and not as deep as pulvinate?

Accepted Answer

Convex

Question 15

A student describes a colony as 'translucent.' What does this indicate about the colony's opacity?

Accepted Answer

Light passes through, but the colony is not completely clear

Question 16

Which of the following is a critical reason for accurately describing the culture conditions when documenting colony morphology?

Accepted Answer

Colony morphology can be influenced by culture conditions

Question 17

A colony is described as 'butyrous.' What does this term indicate about the colony's surface?

Accepted Answer

The colony has a buttery consistency

Question 18

Which of the following best describes a colony with a margin that is smooth and unbroken?

Accepted Answer

Entire

Question 19

A microbiologist notes a distinctive odor coming from a bacterial colony. According to best practices, how should this observation be documented?

Accepted Answer

As an 'other' distinguishing characteristic

Question 20

Which of the following is the best description of a 'crateriform' colony elevation?

Accepted Answer

A colony with a central depression

Colony Morphology: Describing Microbial Colonies on Agar Plates

Study Guide - Practice Questions