The hormone that helps us respond to low oxygen levels by promoting an increase in red blood cell counts is
A. erythropoietin.
B. hemopoeitin.
C. renin-angiotensin.
D. adrenocorticotropin.
E. estradiol.
A. erythropoietin.
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Which of the following contain both chlorophyll a and chlorophyll b?
A. Green sulfur bacteria B. Cyanobacteria C. Purple sulfur bacteria D. Prochloron
A smooth pattern of variation along a geographical gradient is referred to as a ____
a. ring species b. hybrid zone c. morphological species d. cline e. cluster of subspecies
In photosynthesis, the uptake of CO2 by plants occurs through openings on the surface of
A) roots. B) stems. C) leaves. D) flowers.
Which of the following elements of the sliding-filament model of muscle contraction is incorrectly defined?
a) tropomyosin—a regulatory protein b) troponin complex—a set of additional regulatory proteins c) transverse tubules—infoldings of the plasma membrane d) sarcoplasmic reticulum—a specialized endoplasmic reticulum e) calcium ions—ions bound to the myosin protein that play a role in muscle contraction and relaxation