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TLS Online TPP Program

#Question id: 944

Because they lack aspartate kinase and aspartate semialdehyde dehydrogenase, ________ cannot synthesize lysine, methionine or threonine.

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. bacteria 

  2. fungi  

  3. tobacco plants

  4. mammals

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TLS Online TPP Program

#Question id: 10903

#Unit 6. System Physiology – Plant

Materials translocated in the phloem, such as sucrose, amino acids, hormones and some inorganic ions. Some inorganic solutes that move in the phloem called mobile elements. In contrast, some are relatively immobile in the phloem.

A) Immobile elements

B) Mobile elements

i) potassium, magnesium, phosphate, and chloride

ii) caesium, zinc, magnesium and iron

iii) nitrate, calcium, sulfur, and iron

iv) potassium, calcium, cobalt and caesium

Which of the following are the correct match of mobile and immobile elements in the phloem?
TLS Online TPP Program

#Question id: 33374

#Unit 1. Molecules and their Interaction Relevant to Biology

The 310 helix has 
TLS Online TPP Program

#Question id: 4815

#Unit 8. Inheritance Biology

The cross over percentage between linked genes J and M is 20%, J and L is 35%, J and N is 70%, L and K is 15%, M and N 50%. The sequence of genes on the chromosome is
TLS Online TPP Program

#Question id: 29516

#Unit 6. System Physiology – Plant

Cyanide inhibits cytochrome c oxidase in the mitochondria, which blocks the electron transport chain produced  by given reaction involves enzyme a and b which are
TLS Online TPP Program

#Question id: 13054

#Unit 13. Methods in Biology

Precision will be reduced, but yield will be increased
Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.
What would the expected effect be on a PCR reaction if the primers used were slightly shorter and more variable than the intended oligonucleotide sequences?