Question

QUESTION

1. Check all of the following that are true for the glycocalyx.

   		Eukaryotic glycocalyx is attached to the cell via membrane lipids.
   		Eukaryotic glycocalyx is secretd from the cell.
   		Prokaryotic glycocalyx is made mostly of proteins.
   		Eukaryotic glycocalyx is important for recognition of hormones and cell signaling.
   		Prokaryotic glycocalyx is important in protection from the host immune system.
   		Prokaryotic glycocalyx is interior to the cell membrane.

QUESTION 37

1. Which cells do not typically have peptidoglycan in their cell walls (check all that apply)

   		Mycoplasma
   		Monomorphic cells.
   		Archaea
   		Mycobacterium
   		Fungi
   		Bacilli

QUESTION 40

1. Which of the following correctly describes the swan neck flask?

   		Liquid broth in the flask remained sterile for many years.
   		Spontaneous generation occurs in this flask.
   		This flask must be sealed in order to prevent immediate contamination by microbes.
   		Microbes can contaminate the sterile broth in the flask by falling into the flask from the air.
   		Broth in the flask does not have access to air.

QUESTION

1. Which of the following two microbes belong in the same category?

   		Yeast and Molds.
   		Bacteria and Viruses.
   		Viruses and Helminths.
   		Bacteria and Fungi.
   		Protozoa and Prions.

Answer 1

Question 1

All are true for the glycocalyx because The glycocalyx is a carbohydrate-enriched coating that covers the outside of many eukaryotic cells and prokaryotic cells, particularly bacteria . When on eukaryotic cells the glycocalyx can be a factor used for the recognition of the cell. On bacterial cells, the glycocalyx provides a protective coat from host factors. The possession of a glycocalyx on bacteria is associated with the ability of the bacteria to establish an infection.

Eukaryotic glycocalyx is important for recognition of hormones and cell signaling.

The glycocalyx of bacteria can assume several forms. If in a condensed form that is relatively tightly associated with the underlying cell wall, the glycocalyx is referred to as a capsule. A more loosely attached glycocalyx that can be removed from the cell more easily is referred to as a slime layer.

Question 2

Correct answer is Mycoplasma becaues  mycoplasmas are the only bacteria that naturally lack a cell wall. Mycoplasmas maintain a nearly even pressure between the outside environment and the cytoplasm by actively pumpinsodium ions. Their cytoplasmic membranes also contain sterols that most likely provide added strength. The remaining gram bacteria in the domain Bacteria, with the exception of a few bacteria such as the Chlamydias, have a semirigid cell wall containing peptidoglycan.

Question 3.

Correct answer is spontaneous generation occur in the flask .

Explain: Pasteur's experiment showed that microbes cannot arise from nonliving materials under the conditions that existed on Earth during his lifetime. But his experiment did not prove that spontaneous generation never occurred. Eons ago, conditions on Earth and in the atmosphere above it were vastly different.

Question no 4.

Correct answer is yeast and molds .

Explain: The major groups of microorganisms—namely bacteria, archaea, fungi (yeasts and molds), algae, protozoa, and viruses—are summarized below. Links to the more detailed articles on each of the major groups are provided.