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TLS Online TPP Program

#Question id: 3846

A heat-sensitive DNA ligase (25°C permissive, 37°C nonpermissive) has been used to show that DNA synthesis is discontinuous. Examination of DNA replication in the presence of [3H]-thymidine in the mutant would demonstrate which of following?

#Unit 3. Fundamental Processes

  1. The accumulation of short segments of unlabeled DNA at 25°C and at 37°C

  2. The accumulation of short segments of unlabeled DNA at 25°C but not at 37°C

  3. The accumulation of short segments of radioactive DNA at 25°C but not at 37°C

  4. The accumulation of short segments of radioactive DNA at 37°C but not at 25°C

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TLS Online TPP Program

#Question id: 12928

#Unit 13. Methods in Biology

Name the enzyme which is used to stabilize bases.
TLS Online TPP Program

#Question id: 13122

#Unit 2. Cellular Organization

Choose the incorrect?
1- COPI vesicles transport proteins from the rough ER to the cis -Golgi; COPII vesicles transport proteins in the reverse s Direction.
2- The KDEL receptor binds more tightly to its ligand ar low pH, and it is thought that the receptor is able to bind KDEL peptides in the cis-Golgi but to release these peptides in the ER because the pH of the Golgi is slightly lower than that of the ER.
3- The KDEL sorting signal is recognized and bound by the KDEL receptor, a transmembrane protein found primarily on small transport vesicles shuttling between the ER and the cis -Golgi and on the cis-Golgi reticulum.
TLS Online TPP Program

#Question id: 12785

#Unit 10. Ecological Principles

Which of the following members of a marine food chain occupies a similar tropic level to a grasshopper in a terrestrial food chain?
TLS Online TPP Program

#Question id: 15979

#Unit 12. Applied Biology

Embryo developed through the cell proliferation__
a) From the explant without callus formation
b) Callus formation takes place
c) By indirect embryogenesis
d) By direct embryogenesis
e) By using growth regulator
TLS Online TPP Program

#Question id: 3667

#Unit 3. Fundamental Processes

In an ______________ plasmid, replication occurs in two stages. In the first stage, the double stranded circular plasmid DNA replicates to form another double-stranded circular DNA and a single-stranded circular DNA, In the second stage, the complementary strand is synthesized on the single-stranded DNA to make another double-stranded DNA.