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

Biology & Microbiology

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Crossing-over results in 

A. chromosome duplication. B. new combinations of genes. C. point mutations. D. All of these answers are true.

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Bacterial chromosomes are always circular DNA molecules.

Answer the following statement true (T) or false (F)

Biology & Microbiology

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.

Biology & Microbiology