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TLS Online TPP Program

#Question id: 4568

 In Darwinʹs thinking, the more closely related two different organisms are, the

#XL - S Microbiology

  1. more similar their habitats are.

  2. less similar their DNA sequences are.

  3. more recently they shared a common ancestor.

  4. less likely they are to have the same genes in common.

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TLS Online TPP Program

#Question id: 4605

#XL - T Zoology

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?
TLS Online TPP Program

#Question id: 2922

#XL - T Zoology

Human genes/proteins that regulate the cell cycle are most easily isolated by:
TLS Online TPP Program

#Question id: 7286

#XL - R Botany

Which of the floral whorls is affected in apetala 3/pistillata (ap3/pi) mutants?
TLS Online TPP Program

#Question id: 18005

#XL - T Zoology

Which structure is common to both gymnosperms and angiosperms? 
TLS Online TPP Program

#Question id: 2122

#XL - S Microbiology

The inner (plasma) membrane of E. coli is about 75% lipid and 25% protein by weight.  How many molecules of membrane lipid are there for each molecule of protein?  (Assume that the average protein is Mr 50,000 and the average lipid is 750.)