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TLS Online TPP Program

#Question id: 5078

A human blastomere is:

#XL - T Zoology

  1. an embryonic cell that is smaller than the ovum

  2. an embryonic structure that includes a fluid-filled cavity

  3. that part of the acrosome that opens the egg's membrane

  4. a cell that contains a (degenerating) second polar body

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TLS Online TPP Program

#Question id: 12575

#XL - R Botany

All of the following are adaptations that permit the camel to be active by day in the desert EXCEPT 
TLS Online TPP Program

#Question id: 4980

#XL - S Microbiology

If an increase in dicynodont species diversity (i.e., number of species) occurred soon after the Permian extinction, and if it occurred for the same general reason usually given for the increase in mammalian diversity following the Cretaceous extinction, then it should be attributed to
TLS Online TPP Program

#Question id: 20182

#XL - P Chemistry

Which is not true with respect to cathode rays?
TLS Online TPP Program

#Question id: 5526

#XL - T Zoology

The allantois
TLS Online TPP Program

#Question id: 4765

#XL - R Botany

The recessive mutant allele that causes cystic fibrosis is much more frequent in Caucasians population than in other world populations. Some scientists believe heterozygotes must have had a survival advantage during plagues such as cholera that occasionally swept through this population. What concept does this illustrate?