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TLS Online TPP Program

#Question id: 9157

At 15-30°N, air masses formed over the Pacific Ocean are moved by prevailing westerlies, where they encounter extensive north-south mountain ranges. Which statement best describes the outcome of this encounter between a landform and an air mass?

#Unit 9. Diversity of Life Forms
  1. The cool, moist Pacific air heats as it rises, releasing its precipitation as it passes the tops of the mountains. This now warm and dry air cools as it descends on the leeward side of the range.
  2. The warm, moist Pacific air rises and cools, releasing precipitation as it moves up the windward side of the range. This now cool and dry air mass heats up as it descends on the leeward side of the range.

  3. The cool, dry Pacific air heats up and picks up moisture from evaporation of the snowcapped peaks of the mountain range, releasing this moisture as precipitation when the air cools while descending on the leeward side of the range.

  4. These air masses are blocked by the mountain ranges, producing high annual amounts of precipitation on the windward sides of these mountain ranges
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TLS Online TPP Program

#Question id: 4691

#Unit 3. Fundamental Processes

Processing of pre-rRNA transcripts (30S)  in bacteria, after the modification and cleavage produces mature RNAs is
TLS Online TPP Program

#Question id: 4690

#Unit 3. Fundamental Processes

Which of the following  of the cleavage enzymes of rRNAs and tRNA is a ribozyme?
TLS Online TPP Program

#Question id: 4689

#Unit 3. Fundamental Processes

Cleavage liberates precursors of rRNAs and tRNA Cleavage at the points that is carried out by the enzymes excepts
TLS Online TPP Program

#Question id: 4687

#Unit 3. Fundamental Processes

Multiplicity of infection (moi) is a measure of how many phage particles infect a given bacterial cell within a population?

a) If the average number is one or fewer phage particles per cell, the infection is more likely to result in lysis

b) If the number of phage particles is two or more, it is more likely to produce lysis

c) If the average number is one or fewer phage particles per cell, the infection is more likely to result in lysogney

d) If the number of phage particles is two or more, it is more likely to produce lysogney

which of the following is the correct prediction of moi measurement?
TLS Online TPP Program

#Question id: 4686

#Unit 3. Fundamental Processes

Bacteriophage λ, has two mode of life cycle;  lytic and lysogenic.  In the lytic growth

a) a single Cro dimer is bound to OR3; this site overlaps PRM and so Cro represses that promoter

b) Repressor bound at OR1 and OR2 blocks RNA polymerase binding at PR, repressing transcription from that promoter

c) PR and PL binds RNA polymerase and directs transcription of lytic genes

d) During lytic, PRM is on while PR (and PL) are off

Find the correct combinations of lytic growth.
TLS Online TPP Program

#Question id: 4685

#Unit 3. Fundamental Processes

Some given characteristics of repressor such as;

 I) λ-repressor and

II) cro-repressor

a) A repressor binds DNA as a dimer

b) A repressor work as both activator and repressor

c) Repressor is a single-domain protein

d) Repressor binds to operator sites cooperatively

e) Only represses transcription, like the Lac repressor

which of the following are correct match statements  of given repressor