Which of the following statements is TRUE of C3b?

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#Question id: 20037

#XL - P Chemistry

Velocity of electron in the first orbit of H-atom is compared to that of velocity of light is approximately

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#Question id: 4613

#XL - T Zoology

The questions below refer to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) and the vertical axis represents morphological change.  Which species is most closely related to species W?

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#Question id: 4620

#XL - T Zoology

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?

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#Question id: 3770

#XL - Q Biochemistry

Semiconservative replication involves a template. What is the template?

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#Question id: 5564

#XL - T Zoology

At the moment of sperm penetration, human eggs ________.