TLS Online TPP Program

#Question id: 4620


The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

#Section 2: Evolution
  1. Forelimb evolution was adaptive in people and bats, but not in whales.

  2. Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.

  3. Genes mutate faster in whales than in humans or bats.

  4. Whales are not properly classified as mammals.

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TLS Online TPP Program

#Question id: 9276

#Section 5: Applied Ecology & Evolution

The carotenoid b-carotene, whose structure and absorption spectrum at,

TLS Online TPP Program

#Question id: 9277

#Section 5: Applied Ecology & Evolution

The light energy absorbed by the carotenoids is transferred to chlorophyll for photosynthesis; because of this role they are called

TLS Online TPP Program

#Question id: 9278

#Section 5: Applied Ecology & Evolution

Bilin pigments are open-chain tetrapyrroles found in antenna structures known as phycobilisomes that occur in

TLS Online TPP Program

#Question id: 10163

#Section 5: Applied Ecology & Evolution

Some statements regarding C2, C3, C4 and CAM plants

a.) For Sucrose synthesis after C2 C3 and C4 cycle having different procedure

b.) C4  cycle reduces occurrence of C2 which is thermodynamically very expensive and toxic by increasing the assimilation of CO2 at high temperature almost at 350 C

c.) C4 plant is generally found in near to equator  and they are more abundant than C3 plant

d.) In Dark when stomata are closed and CO2 not assimilated in the CAM plants

Which of the following statements from above combination is true?

TLS Online TPP Program

#Question id: 9198

#Section 5: Applied Ecology & Evolution

Tropical forests are being converted to farm or pasture land at an alarming rate, and one major focus is on the biodiversity and the impact to these ecosystems. What is a direct benefit to humans that helps explain why these forests need to be preserved?

TLS Online TPP Program

#Question id: 9203

#Section 5: Applied Ecology & Evolution

The human impact that scientists determined has caused the most extinctions on record is ________, and beyond further losses from this impact, the other impact with the largest potential to cause future extinctions is ________.