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TLS Online TPP Program

#Question id: 8925

What is the probable sequence in which the following clades of animals originated, from earliest to most recent?
1. tetrapods
2. vertebrates
3. deuterostomes
4. amniotes
5. bilaterians

#XL - R Botany
  1. 5 → 3 → 2 → 4 → 1
  2. 5 → 3 → 2 → 1 → 4
  3. 5 → 3 → 4 → 2 → 1
  4. 3 → 5 → 4 → 2 → 1
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TLS Online TPP Program

#Question id: 18222

#XL - S Microbiology

Which event during the evolution of land plants probably made the synthesis of secondary compounds most beneficial? 
TLS Online TPP Program

#Question id: 1133

#XL - Q Biochemistry

What tertiary structure characterizes all cytokines?
TLS Online TPP Program

#Question id: 18502

#XL - R Botany

Triticum spelta is cultivated in
TLS Online TPP Program

#Question id: 5298

#XL - S Microbiology

Four E. coli strains of genotype a+ b− are labeled 1, 2, 3, and 4. Four strains of genotype a− b+ are labeled 5, 6, 7, and 8. The two genotypes are mixed in all possible combinations and (after incubation) are plated to determine the frequency of a+ b+ recombinants. The following results are obtained, where M = many recombinants, L = low numbers of recombinants, and 0 = no recombinants. On the basis of these results, assign a sex type (either Hfr, F+, or F−) to each strain
TLS Online TPP Program

#Question id: 1098

#XL - Q Biochemistry

Which of the following is the most plausible explanation for why an animal cell would be unable to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid?