Question

• 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

• 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

• 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

• Which organic molecule is not found on the plasma membrane?

  A. carbohydrates

  B. cholestrol

  c. phospholipids

  d. proteins

• What does this statement mean : "Information flow between cells tissues and organs is an essential feature of homeostasis and allows for integration of physiological processes"

  
  

A. the nervous system is the most prominent body system for integration of physilogical processes 

B. some substances can affect local processes while others travel to exert their effects on other distant parts of the body

C. communication between body structures through body fluids is the most important physiological processes

D. Neurotransmitters, hormones, paracrine and autocrine substances exert their efferts locally as well as distant body structures

• which statement best describes the orientation the phospholipid molecules in a membrane:

A.) the nonpolar fatty acids are oriented towards the cholestrol molecules

B.) the hydrophilic layer is oriented towards the middle of the phosphlipids 

C.) phospholipids align themselves in the membrane in a bimolecular layer

D.) the hydrophobic and hydrophilic structures point away from the cell

• Which is NOT a product of glycolysis under aerobic and anaerobic conditions?

  A.) lactate 

  B.) FADH 

  C.) pyruvate 

  D.) NADH 

• Which reason is why water is an essential nutrient? 

A.) water needs to move between compartments

B.)can be obtained through ingestion

C.) body cant make enough water for its needs

D.) water evaporates from the skin that has the largest surface area among all body structures