microbiology 101 chapter 3 homework

The typical definition of a species is one with distinct characteristics that produce viable offspring when mated with another organism in the same species. Bacterial species cannot be defined as readily, due to the fact that _______.

All of the statements are true regarding the indistinct defining of bacterial species.

A unicellular microorganism was recovered from a hot spring (95°C) in Wyoming. The cells lack a nucleus, have a cell wall that lacks peptidoglycan, and have 70S ribosomes. Analysis of the plasma membrane reveals that the lipids contain long-chained branched hydrocarbons with ether linkages. Please choose the group in which this organism would be classified, based on the description provided.

Archaea

Select the structures that are possessed by some, but not all bacteria.

Flagella, Endospores, Pili, Fimbriae, Glycocalyx

Choose the division that includes the archaea (archaebacteria).

Mendosicutes

A client has a serious case of the flu. A random sample of sputum was taken from the patient coughing up blood. The lab tech said they had isolated a bacterium that did not have any peptidoglycan. You hypothesize that the identity of this microbe could possibly be _______.

Mycoplasma pneumoniae

Choose the substance or condition that triggers sporogenesis among endospore-forming bacteria.

Nutrient depletion

Which structure plays a direct role in the exchange of genetic material between bacterial cells?

Pilus

Gram-negative bacteria _______.

are less susceptible to antibiotics that target peptidoglycan than gram-positive organisms

The two functions of bacterial appendages are ________.

attachment and motility

The site(s) for most ATP synthesis in bacterial cells is(are) the _______.

cell membrane

If bacteria living in salty seawater were displaced to a freshwater environment, the cell structure that would prevent the cells from rupturing is the ________.

cell wall

Peptidoglycan is a unique macromolecule found in bacterial _______.

cell walls

The cell _______ can be composed of three layers: the cytoplasmic membrane, the cell wall, and the outer membrane.

envelope

When an endospore germinates, it develops into multiple vegetative cells ensuring reproductive success.

false

Halobacterium salinarium lives in and requires salt. This is an example of an archaeabacterium described as a(n) _______.

halophile

Chemotaxis refers to the ability to ________.

move in response to a chemical

The term that refers to the presence of flagella over the cell surface is _______.

peritrichous

The presence of variation in the size and shape of bacterial cells of the same species is known as _______.

pleomorphism

The function of bacterial endospores is ________.

protection of genetic material during harsh conditions

A collection of bacterial cells that shares an overall similar pattern of traits different from other groups of bacteria is defined as a bacterial _________.

species

Archaea do not have the typical peptidoglycan structure found in bacterial cell walls.

true

Rods that are slightly curved are called ________.

vibrio

Bacterial endospores are not produced by _______.

Staphylococcus

Which of the following is mismatched?

Thermoplasmas - adapted to frozen environments

Find the true statement about biofilms.

They complicate the treatment of some infections