Biology Answers

Discussion of eukaryotic cell division

Explain withdrawal or flexor reflex based on sherrington's rule

what is the three major anatomic regions of the cell and the physiologic function of each of the regions?

Which of the following compounds are macroergic 

A. glycerol 3-phosphate 

B. Carbamoyl phosphate 

C. Fructose-6-phosphate 

D. Glycerol-3-phosphate 

E. 1,3 - bisphosphoglycerate 

F. Glucose-3-phosphate 

G. Adenosine diphosphate 

Transport RNA is defined as an "adapter" molecule in protein biosynthesis because (more than 1) 

a. reads the amino acid sequence to guide RNA synthesis 

b. connects the 30S and 50S subunits of ribosomes 

c. can “recognize” both aminoacyl-Trnk synthetases and amino acids 

d. functions by "translating" the nucleotide sequence of the mRNA into the corresponding amino acid sequence of the synthesized protein 

Which of the following statements apply to globular proteins (select one or more) 

a. active center is formed at the level-secondary structure 

b. regulatory centers are formed at the level of the quarterly structure 

c. when the tertiary structure is disturbed, partial and complete loss of biological properties occurs 

d. subunits in quaternary proteins bind to covalent bonds 

e. active center is formed at the level-tertiary structure 

2,3-BPG (2,3-bisphosphoglycerate) is an intermediate in the reaction catalyzed by phosphoglycerate mutase. Erythrocytes need minimal amounts of 2,3-BPG because: (select one or more) 

a. involved in the conversion of 3-phosphoglycerate to 2-phosphoglycerate 

b. involved in the formation of 1,3-bisphosphoglycerate 

c. fatty acid synthase regulator 

d. is a negative effect of hemoglobin function 

e. ATP synthase regulator 

Which of the following pairs of amino acids has a negatively charged side chain at pH 8.0? (select one) 

A. asparagine and glutamine 

B. leucine and glycine 

C. histidine and lysine 

D. aspartate and glutamate 

An alcoholic in a state of hypoglycaemic coma was admitted to Pirogov. Since alcoholics usually suffer from malnutrition, Dr. Ivanov performs a biochemical test. Which of the following enzymes should you test for thiamine deficiency? (select one) 

A. UDP-galactose epimerase 

B. transaldolase 

C. aldolase 

D. glucose-6-phosphate dehydrogenase 

E. transketolase 

Which of the following statements about Michaelis-Menten kinetics is true provided that the substrate concentration is equal to Km: (select one or more) 

A. 50% of enzyme molecules are bound to the substrate 

B. the reaction rate is equal to half the Vmax 

C. the reaction rate is equal to Vmax 

D. the reaction rate does not depend on the substrate concentration 

E. the enzyme is completely saturated with substrate