Which of the following molecules are signal molecules for a receptor tyrosine kinase?

1.insulin
2.epidermal growth factor
3.nerve growth factor
4.platelet derived growth factor
5.All of the choices are correct.


5

Biology & Microbiology

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Which of the following is mismatched with regard to similar excellular structures in plant and animal cells?

A) elastins-extensins B) extracellular matrix-cell wall C) collagens-cellulose D) proteoglycans-hemicelluloses E) fibronectins-pectins

Biology & Microbiology

Substrate-level phosphorylation occurs during which of the following stage(s) of glucose catabolism?

A) formation of acetyl-CoA B) lysis stage of glycolysis C) energy-conservation stage of glycolysis D) Krebs cycle E) formation of acetyl-CoA and the Krebs cycle

Biology & Microbiology

In sickle cell anemia, the defective hemoglobin differs from the normal hemoglobin by  

A.  the color of the pigment. B.  the size of the molecule. C.  a single amino acid substitution. D.  the total number of amino acids. E.  the type of blood cell it is found in.

Biology & Microbiology

Which of the following is the correct order for the synthesis of the plant cell wall, from the outermost layer to the innermost layer?

A) middle lamella; primary cell wall; secondary cell wall; plasma membrane B) primary cell wall; middle lamella; secondary cell wall; plasma membrane C) plasma membrane; secondary cell wall; primary cell wall; middle lamella D) middle lamella; secondary cell wall; primary cell wall; middle lamella E) primary cell wall; secondary cell wall; plasma membrane; middle lamella

Biology & Microbiology