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TLS Online TPP Program

#Question id: 1022

Why are we concerned at all with monitoring emerging/reemerging diseases?

#Unit 4. Cell Communication and Cell Signaling

  1. These represent growing threats to human health that will require new scientific research and resources to effectively combat.

  2. Because globalization (greater trade and travel between countries) leads to more chances for spread of illnesses into new areas and populations. Monitoring these illnesses will help us to protect people.

  3. Because the speed of travel has increased greatly. With increased speed of travel, it is far more likely that a serious pathogenic threat from one area of the world can spread rapidly across the globe in a very fast manner. We need to monitor the occurrence of these illnesses to try to protect populations.

  4. All of the above.

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TLS Online TPP Program

#Question id: 4654

#Unit 9. Evolution & Diversity of Life Forms

Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?
TLS Online TPP Program

#Question id: 4655

#Unit 9. Evolution & Diversity of Life Forms

Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
TLS Online TPP Program

#Question id: 4656

#Unit 9. Evolution & Diversity of Life Forms

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?
TLS Online TPP Program

#Question id: 4657

#Unit 9. Evolution & Diversity of Life Forms

 Which of the following statements most detracts from the claim that the human appendix is a completely vestigial organ?
TLS Online TPP Program

#Question id: 4658

#Unit 9. Evolution & Diversity of Life Forms

Members of two different species possess a similar-looking structure that they use in a similar fashion to perform the same function. Which information would best help distinguish between an explanation based on homology versus one based on convergent evolution?
TLS Online TPP Program

#Question id: 4659

#Unit 3. Fundamental Processes

Many bacterial responses are controlled by two component regulatory systems. What will happen at the high concentration of glutamine and at the low concentration of glutamine?

a) At high concentrations glutamine binds to a sensor domain of NtrB conformational change in the protein that inhibits its histidine kinase activity

b) NtrC phosphorylation takes place causes a conformational change in NtrC that unmasks the NtrC DNA-binding domain so that it can bind to the glnA enhancers

c) At the same time, the regulatory domain of NtrC blocks its DNA-binding domain from binding the glnA enhancers

d) At low concentrations of glutamine dissociates from the sensor domain in the NtrB protein, leading to activation of a histidine kinase transmitter domain

Which of the following given combination is correct?