Which amino acid is least likely to participate in acid-base catalysis?

TLS Online TPP Program

#Question id: 28556

#Unit 5. Developmental Biology

In Dictyostelium, Neighboring cells respond to cAMP by which phenomenon?

a) inducing genes involved in cAMP synthesis and detection

b) Initiate a movement toward the cAMP pulse for about a minute

c) Release cAMP of their own

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#Question id: 26884

#Unit 10. Ecological Principles

c value define by many characteristics given below, except?

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#Question id: 12330

#Unit 10. Ecological Principles

Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

TLS Online TPP Program

#Question id: 11729

#Unit 6. System Physiology – Plant

Given some properties of cytokinin;

a) Kinetin is a naturally occurring plant growth regulator

b) it does occur as a base in the DNA of any species

c) It is a by-product of the heat-induced degradation of DNA

d) the deoxyribose sugar of adenosine is converted to a furfuryl ring and shifted from the 9 position to the 6 position on the adenine ring

which of the following given statements incorrect?

TLS Online TPP Program

#Question id: 15831

#Unit 8. Inheritance Biology

Your friends Ben and Jane are contemplating having children and seek your genetic counsel. Ben and Jane are unrelated, but both have younger brothers with the same, extremely rare genetic trait. (In fact, Ben and Jane met at a support group meeting for children and families of children with this rare disorder.) Ben’s parents and Jane’s parents are all unaffected.        

 Assume that the trait is X-linked recessive with complete penetrance. What is the probability that Ben and Jane’s first child will be affected? What is the probability that the first child will be a carrier?