Exam 1 Flashcards
A metal ion that is essential for an enzyme activity is one example of a(n):
cofactor
The general purpose of staining a bacterial smear is to :
increase the contrast of the specimen
In one group of bacteria, the outermost layer of the cell envelope contains lipopolysaccharide. This group of bacteria is:
Gram-negative
What is one consequence of lipopolysaccharide being present on the surface of the bacterial cell?
It triggers a strong immune response against the bacterial cell in a host.
Activation energy is:
the energy barrier that must be overcome to convert substrate to product
Aseptic technique refers to:
laboratory procedures designed to keep microorganisms contained as they are grown and transferred so as to prevent contamination
A DNA or RNA nucleotide is composed of an:
organic nitrogen-containing base, pentose sugar, and phosphate group(s)
What can be said about the enzyme-catalyzed reaction depicted in the diagram?
The reaction is exergonic because the product exists at a lower energy level than the substrate
A microbiologist observes that all known bacteria discovered in the past have DNA as their genetic material. Therefore, he predicts that all new bacteria discovered in the future will also have DNA as their genetic material. This type of thinking is an example of:
inductive reasoning
All of the following are functions of various proteins in the bacterial cell membrane except:
mitosis and meiosis
When an object lies inside the focal length of a convex lens, the image seen by an observer is called a(an):
virtual image
The first person to give a description of cells based on his microscopical observations was:
Robert Hooke
If you wish to improve the resolution of the compound microscope, what would be the simplest step to take in the laboratory?
Add a drop of immersion oil between the specimen on the microscope slide and the 100x objective.
What is the reason for immersion oil?
Resolution improves as n increases, where n is the index of refraction of the transparent medium between the microscope slide and the objective.
Most capsules are composed of a network of polysaccharide fibers that is called the:
glycocalyx
A catalyst:
increases the rate of a chemical reaction