Protein synthesis on the primordial Earth may have been catalyzed by ____ before the evolution of enzymes
a. lightning
b. RNA
c. carbohydrates
d. amino acids
e. DNA
b
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If a patient has a deep tissue infection as the result of an animal bite on the arm, the portal of entry is described as the __________.
A) connective tissue B) skin C) respiratory route D) parenteral route E) gastrointestinal route
As blood is pumped through the body, which of the following is the correct order of blood vessels the blood will encounter as it leaves the heart?
a) artery-vein-capillary-venule-arteriole b) arteriole-artery-capillary-vein-venule c) artery-arteriole-capillary-venule-vein d) vein-venule-capillary-arteriole-artery
Three critical amino acids in the active site of an enzyme are arginine, lysine, and histidine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
What is the advantage of the proofreading function of DNA polymerase?
A. All DNA mutations can be detected and repaired during DNA replication. B. DNA polymerase is always present in the nucleus and can repair all mutations when they occur. C. DNA polymerase can be recruited to recently mutated sites to repair mutations. D. DNA polymerase can repair most mutations as they occur during DNA replication.