Gingivitis is a Periodontal pathogen that causes dental plaques. There are more than 500 species in the oral cavity. A study states that at least 3 genera of bacterial isolates were able to stimulate light production and about 170 were able to respond to the autoinducer AI-2. The signal for AI-2 induces the growth of the bacteria which eventually increases the severity of the infection.

a) Since 170 bacterial isolates respond to AI-2 quorum sensing alone, how many bacterial isolates use:

agr quorum sensing

hsl quorum sensing

AI-2/agr quorum sensing

AI-2/hsl quorum sensing?

b) If AI-2 induces growth and increases the severity of infection, do bacteria that use agr quorum sensing do the same thing or do they differ? What about bacteria that use hsl quorum sensing?

Describe how components of the cytoskeleton, cytoplasm, cell surface and extracellular matrix interact to form cell junctions and the roles of distinct junction types in skin

Diagram and explain transcription

What are the 7 steps of Intramembranous ossification?

As we ride the glucose molecule into the small intestine we see a curious rod shaped organism. Upon further inspection we notice that it has an outer membrane with lipopolysaccharide. We barely have time to contemplate what this means before we feel the pull of transport. We ride past the cell wall (outer membrane and peptidoglycan) and are pulled through a transporter and into the cytoplasmic membrane of the cell. We ride through the transporter’s hydrophilic center, down the concentration gradient and into the cytoplasm.

1. What type of protein is this transporter?

Membrane transport protein

2. What type of transport are we experiencing?

What is the relationship between Microvilli of gut, epithelium, glucose, circulatory system, capillary fenestrations, glucose/ATP/life. Major emphasis on RELATIONSHIP

why you think a solid understanding of Biology is important for our everyday lives.

• What is LTP?
• What are some of the presynaptic changes observed?
• What are some of the postsynaptic changes observed?
• How do the AMPA and NMDA glutamate receptors contribute to LTP?

Many ecologists view continual growth as impossible in the long run due to limits imposed by nonrenewable resources and the capacity of the biosphere to absorb wastes. Others argue that through the use of technology and social organization, we can manage to meet our needs and provide long-term (but not infinite) growth. WHAT DO YOU THINK ? Please provide a structured essay with your thoughts,

During starvation, the body adapts to ensure that cells have access to a variety of fuel sources. Select all of the biochemical pathways that are active during periods of prolonged starvation.

Choose All That Apply

A. Ketogenesis

B. Lipolysis

C. Proteolysis

D. Gluconeogenisis

E. Glycogenesis

F. Lipogenesis