Consider the following electronegativity values: Boron (B) = 1.8 Carbon (C) = 2.5 Chlorine (Cl) = 3.2 Selenium (Se) = 2.6 Which of the following bonds is the most polar?
A. Se-Cl
B. C-Cl
C. B-Cl
D. cannot determine from the information provided
C. B-Cl
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Which of the following hormones counteract each other in regulating calcium homeostasis?
A. antidiurectic hormone and aldosterone B. atrial natriuretic peptide and aldosterone C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D) D. antidiurectic hormone and parathyroid hormone E. antidiurectic hormone and vitamin D (1,25 dihydroxyvitamin D)
During DNA replication, which enzyme removes the RNA primers and then fills in the gap?
A. DNA pol III B. DNA ligase C. DNA pol I D. DNA primase
A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are a little below normal, and no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is
the likeliest diagnosis for this child? A) Bruton-type agammaglobulinemia B) Grave's disease C) severe combined immune deficiency (SCID) D) systemic lupus erythematosus (SLE) E) hemolytic disease of the newborn
Both meiosis I and meiosis II decrease the total number of chromosomes found in a cell.
a. true b. false