TLS Online TPP Program

#Question id: 748


The bond between the bases and the sugars in DNA referred as:

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. hydrogen bond

  2. glycosidic bond

  3. phosphodiester bond

  4. covalent linkage

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TLS Online TPP Program

#Question id: 11554

#Unit 7. System Physiology – Animal

What happens in a cell when adenylyl cyclase is activated?

TLS Online TPP Program

#Question id: 13176

#Unit 10. Ecological Principles

Coral reefs can be found on the southern east coast of the United States but not at similar latitudes on the southern west coast. Differences in which of the following most likely account for this?

TLS Online TPP Program

#Question id: 18079

#Unit 9. Diversity of Life Forms

Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs? 
1. Sporophyte embryo 2. female gametophyte 
3. egg cell                 4. megaspore 

TLS Online TPP Program

#Question id: 1089

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements describes a likely effect of a drug designed that inhibits the cellular response to testosterone?

TLS Online TPP Program

#Question id: 879

#Unit 1. Molecules and their Interaction Relevant to Biology

 Correct approaches to protein structure prediction-:

i. Homology modeling

a) Methods is the Rosetta program, formulated by David Baker. To satisfy the program’s computational needs, a volunteer network of ∼100,000 computers, known as Rosetta@home, provides the 500,000 or so hours of processing time required to generate a structure.

ii. Structural genomics

b) which seeks to determine the X-ray structures of all representative domains, is aimed at expanding this predictive technique. The identification of structural homology is likely to provide clues as to a protein’s function even with imperfect structure prediction.

iii. Threading

c) Is a computational technique that attempts to determine the unknown structure of a protein by ascertaining whether it is consistent with a known protein structure. It does so by placing the unknown protein’s residues along the backbone of a known protein structure and then determining whether the amino acid side chains of the unknown protein are stable in that arrangement

iv. Ab initio

d) Aligns the sequence of interest with the sequence of a homologous protein or domain of known structure—compensating for amino acid substitutions, insertions, and deletions—through modeling and energy minimization calculations.