Breathing is usually regulated by
A. erythropoietin levels in the blood.
B. the concentration of red blood cells.
C. hemoglobin levels in the blood.
D. CO2 concentration and pH sensors.
E. the lungs and larynx.
D. CO2 concentration and pH sensors.
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Let P = purple flowers and p = white, and T = tall plants and t = dwarf. If the upper case letters represent the dominant alleles, what is the phenotype of a plant with the genotype PpTt?
A. purple flowers, tall B. purple flowers, dwarf C. white flowers, tall D. white flowers, dwarf E. pale purple flowers, intermediate height
How is synaptic signaling different from paracrine signaling?
A. Synaptic signaling specifically involves neurotransmitters that are released from neurons. B. Synaptic signaling acts over a longer distance than paracrine signaling. C. Synaptic signaling requires receptors to elicit a response in the target cell. D. Synaptic signaling is longer in duration than paracrine signaling. E. All of the answer options are correct.
Plastocyanin (PC) is a copper-containing protein that, like plastoquinol, is a mobile ________ carrier in photosynthesis
Fill in the blank with correct word.
Which of the following statements is FALSE?
A) Carbon, hydrogen, oxygen, and nitrogen are the most abundant elements of living matter. B) Some naturally occurring elements are toxic to organisms. C) All life requires the same essential elements. D) Iron is needed by all humans.