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TLS Online TPP Program

#Question id: 561

Enzyme X exhibits maximum activity at pH = 6.9.  X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4.  One likely interpretation of this pH activity is that:

#SCPH05 I Biotechnology

  1. a Glu residue on the enzyme is involved in the reaction.

  2. a His residue on the enzyme is involved in the reaction.

  3. the enzyme has a metallic cofactor.

  4. the enzyme is found in gastric secretions

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TLS Online TPP Program

#Question id: 18223

#SCPH06 I Botany

The origin of indirect evidence of life, no recognizable fossils except bacteria (microfossils) was during which geological eras?
TLS Online TPP Program

#Question id: 3524

#SCPH12 I Genetics

Which of the following genotypes would produce the greatest variety of gametes of the alleles assorted independently?
TLS Online TPP Program

#Question id: 10959

#SCPH28 | Zoology

 Which of the following would best explain a prolonged bleeding time test?
TLS Online TPP Program

#Question id: 8852

#SCPH28 | 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?
TLS Online TPP Program

#Question id: 15560

#SCPH28 | Zoology

Nearly all of the genetic improvements to industrially important antibiotic-producing strains have been achieved by the use of