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TLS Online TPP Program

#Question id: 4605

Over long periods of 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?

#SCPH28 | Zoology

  1. Natural selection cannot account for losses, but accounts only for new structures and functions.

  2. Natural selection accounts for these losses by the principle of use and disuse.

  3. Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.

  4. The ancestors of these organisms experienced harmful mutations that forced them to lose these structures.

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TLS Online TPP Program

#Question id: 15215

#SCPH06 I Botany

Different from conventional gels (Resolving and stacking gel), the matrix of single gels introduced contains three amino acids are
TLS Online TPP Program

#Question id: 5590

#SCPH01 Biochemistry

The theory that every cell of an organism has the same genome as every other cell
TLS Online TPP Program

#Question id: 5130

#SCPH01 Biochemistry

Regulation by gradients of paracrine factor concentration was elegantly demonstrated by the specification of different mesodermal cell types in the frog Xenopus laevis by activin, a paracrine factor of the TGF-beta family. Which of the following observations are correct from this graph?
TLS Online TPP Program

#Question id: 1691

#SCPH01 Biochemistry

What is the structure recognized by the αβ T-cell receptor on the cell surface of an antigen-presenting cell?
TLS Online TPP Program

#Question id: 3482

#SCPH28 | Zoology

Which statement below about mating behavior is correct?

A) Some aspects of courtship behavior may have evolved from agonistic interactions.

B) The degree to which evolution affects mating relationships depends on the degree of prenatal and postnatal input the parents are required to make.

C) The mating relationship in most mammals is monogamous, to ensure the reproductive success of the pair.

D) Polygamous relationships most often involve a single male and many females, but in some species this is reversed