Which of the following factors influence the rise in ventilation during exercise? (Select all that apply.)
a. A rise in K+ in the blood during heavy exercise
b. A drop in PO2 in the blood
c. Feedback from sensory neurons in the skeletal muscles
d. Input from centers of the brain driving locomotion
Answer:
a. A rise in K+ in the blood during heavy exercise
c. Feedback from sensory neurons in the skeletal muscles
d. Input from centers of the brain driving locomotion
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Which chemical, contained in the granules of basophils, helps prevent blood clot formation?
a. histamine b. leukotrienes c. prostaglandins d. heparin e. SRS-A
Crossing-over results in
A. chromosome duplication. B. new combinations of genes. C. point mutations. D. All of these answers are true.
Bacterial chromosomes are always circular DNA molecules.
Answer the following statement true (T) or false (F)
Cyanobacteria, or blue-green algae, are considered the most ancient organisms capable of photosynthesis. Given what you know about cyanobacteria, which of the following is the more similar species?
A. Halobacterium salinarum; A unicellular obligate aerobe that often inhabits hypersaline lakes. This species produces gas vesicles in order to maximize its access to oxygen at the lake's surface. B. Rickettsia rickettsii; A unicellular intracellular pathogen that infects warm-blooded animals, including humans, causing Rocky Mountain spotted fever. C. Nitrosolobus multiformis; A unicellular rod-shaped nitrifying bacterium that inhabits subsurface soils at depths associated with plant roots. D. Nostoc verrucosum; A filamentous species often found in shallow streams and creeks that is capable of fixing atmospheric nitrogen using specialized cells known as heterocytes.