AP Bio Chapter 45 Part 2

Question 0

Vibrio fisheri

Answer 0

Bacterium that lives in organisms in marine animals, when population density hits a threshold, they begin to produce a light-producing protein, which gives them bioluminescence

Question 1

Quorum sensing

Answer 1

How unicellular organisms communicate chemically w one mother. Communication among microbes that triggers group response once particular population densities are released.

Question 2

Biofilms

Answer 2

Bacterial ecosystems that are established and maintained due to elaborate quorum sensing networks.

Question 3

Apoptosis

Answer 3

Programmed cell death, programmed because of the sugnals pathways that it is programmed to

Question 4

Death proteins are present where and what state

Answer 4

In every cell inactive form prior to signal reception

Question 5

What does amplifying a message mean

Answer 5

One signal molecule (ligand) could release millions of another molecule

Question 6

Membrane receptors are used by what type of molecules

Answer 6

A hydrophilic ligand, water soluble and polar.

Question 7

Describe the process a hydrophobic molecule takes

Answer 7

Goes straight through the plasma membrane, binds to a receptor molecule in the cytoplasm, this complex goes into the DNA, and can either turn a gene on or off or start making a protein or stop making a protein

Question 8

Ligand can be diffusable through

Answer 8

Cellular junctions

Question 9

Positive feedback definition

Answer 9

A form in regulation in which an end production of a process speeds up that process

Question 10

Negative feedback definition

Answer 10

A form of regulation in which an accumulation of the end product in that process slows down the process