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TLS Online TPP Program

#Question id: 5761

E. coli cells were spread on an agar plate, producing 1000 colonies.  The colonies are replica plated on two agar plates containing the antibiotic kanamycin and one agar plate without antibiotics.  All of the colonies are able to grow on the agar plate without antibiotic but only 4 colonies are able to grow on each of the agar plates containing kanamycin.  You notice that the four colonies that grew on each of the kanamycin containing plates are in the exact same position.  This demonstrates

#SCPH28 | Zoology

  1. how to screen for environmental mutagens

  2. that mutations occur in prokaryotes as well as in eukaryotes

  3. that in some cases mutations are caused by the selective agent itself

  4. a direct correlation between the amount of the selective agent used and the number of resistant mutants (one-hit relationship)

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TLS Online TPP Program

#Question id: 381

#SCPH05 I Biotechnology

Consider an acetate buffer, initially at the same pH as its pKa (4.76). When sodium hydroxide (NaOH) is mixed with this buffer, the:
TLS Online TPP Program

#Question id: 10694

#SCPH28 | Zoology

Which of the following is characteristic of parasitoid/ predators?

a) consumer usually larger than resource

b) Consumer requires one host for complete development.

c) Habitat independent

d) Consumer takes long time to kill host

e) Consumer never kills their host

f) Host is free living

Which of the following is feature of parasitoid?
TLS Online TPP Program

#Question id: 17920

#SCPH01 Biochemistry

C in CATH database stands for
TLS Online TPP Program

#Question id: 15661

#SCPH12 I Genetics

Which of the following is NOT true of a maternal effect gene?
TLS Online TPP Program

#Question id: 18636

#I Life Science/ Life Sciences Group – I-V

Number of rooted trees in a phylogeny of three sequences is –