The 3D structure of the complete Escherichia coli ribosome with bound mRNA and tRNAs revealed that the very amino terminus of one protein (L27) does reach into the active site. This finding suggested a role for this protein in catalysis. To test this possibility, the nine amino acids at the L27 amino terminus that were in close proximity to the active site were eliminated by mutation. The following possible outcomes were found to be correct as

A. The resulting cells produced ribosomes with reduced but detectable peptidyl transferase activity

B. Region of the L27 protein contributes to peptidyl transferase activity

C. The mutant ribosomes, didn’t synthesised wildtype levels of cells

D. Vast majority of this increase in peptide bond formation is retained, even without the presence of L27 in the active site

E. The most likely role for L27 is to correctly position one or more of the RNA components of the active site

TLS Online TPP Program

#Question id: 24573

#Unit 10. Ecological Principles

Calculate the finite rate of increase, if ecologists count the number of birds in the population, N0= 100, the next year ecologists count 110 birds in the same population, 

TLS Online TPP Program

#Question id: 24574

#Unit 10. Ecological Principles

If number of birds in the population N0= 100 next year ecologists count 110 birds in the same population, consider a population of birds growing at a rate of 5% per year. After 5 years how many birds would there be?

TLS Online TPP Program

#Question id: 24575

#Unit 10. Ecological Principles

If the initial population size 1000 then given population birth rate is 0.55, and death rate is 0.45, then calculate the change in population per unit time?

TLS Online TPP Program

#Question id: 24576

#Unit 10. Ecological Principles

The birth of 100 cockroaches to a population of 1,000 would represent a birth rate. Similarly, the death of 50 cockroaches in a population of 1,000 would be a death rate, d, per individual per week. Calculate the rate of change in a population per unit time ?

TLS Online TPP Program

#Question id: 24577

#Unit 10. Ecological Principles

If the initial population size is 10 and the per capita growth rate is 0.1. what would be change in the population size after time t=2?

TLS Online TPP Program

#Question id: 24578

#Unit 10. Ecological Principles

if ecologists count the number of birds after a year is 150 in the same population which have the finite rate of increase will be 1.5. Calculate the initial population size of given population?