Question

• Order the sequence of events in transcription?

1- free ribonuleotide triphosphates base-pair with the deoxyribonucleotides in the DNA template 

2- RNA polymerase binds to the promoter region of a gene

3- primary rna transcript is formed 

4- two DNA strands are seperated

• Figure the 2 statements that would not describe the pathway that leads to the secretion of proteins from cells?

statement A: proteins from the golgi bodies are processed further in the endoplasmic reticulum

statement B: The signal sequence directs the endoplasmic reticulum

statement C: A secretory vesicle buds off from the golgi bodies 

statement D: signal sequence is removed in the lumen of the endoplasmic reticulum 

          - A&D

• -A or B

• -C & D

•  - B & C

• how can an irreverible step in a metabolic pathway be reversed?

  A. When both the reactants and products have equal amounts of energy

  B. When the reactants contain large amounts of energy

  C. When another chemical reaction with a large amount of energy occurs at same time 

  D. when collision of substances generate the energy needed