When the acidic level of human blood increases, how is the proper balance of hydrogen ions (H+) restored?
A) Bicarbonate (HCO3-) releases H+ ions that combine with excess OH- ions to form H2O.
B) Carbonic acid eats up the extra OH- ions.
C) Bicarbonate (HCO3-) accepts H+ ions and forms carbonic acid.
D) H+ ion-donor levels increase.
C
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Genetically based characteristics that make organisms more likely to survive and reproduce are referred to as ____
a. acquired characteristics b. adaptive traits c. favored characteristics d. selective traits e. divergent characteristics
Which of the following is (are) true concerning
antigen-presenting cells? a. They may be macrophages. b. They may be B cells. c. They may be dendritic cells. d. They have antigen bound to their MHC markers. e. All of these are true.
During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat (b) the presence of vegetation that was toxic if eaten; who ate only meat (c) inconsistent food supplies; who preferred high-calorie foods (d) animal predators; who were lean and could ambulate quickly
Which of the following is a trait unique to photosynthetic eukaryotes?
a. The presence of chlorophyll a b. The presence of chloroplasts c. The presence of thylakoid membranes d. Using water for reducing power e. Living in aerobic environments