Some cells contain membrane-bound
compartments called
a. organs.
b. organites.
c. organelles.
d. organella.
e. organellum.
C
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Which of the following accurately describes the structure of fibrous proteins?
A) Fibrous proteins usually contain a number of different domains with different structural motifs. B) Fibrous proteins are composed of an equal mixture of ? helices and ? sheets with interconnecting looped segments. C) Fibrous proteins have an extensive tertiary and quaternary structure that affects the strength and elasticity of each fiber. D) Fibrous proteins have a simple primary structure and very little secondary structure, resulting in long, thin fibers. E) Fibrous proteins are usually composed of either ? helices or ? sheets throughout the molecule, giving them a highly ordered, repetitive structure.
NADPH is made by
A. the Krebs cycle. B. glycolysis. C. the Calvin cycle. D. the passing of electrons from photosystem I to an electron transport chain. E. chemiosmosis.
where does replication take place?
What will be an ideal response?
Chemoreceptors located in the aortic and carotid bodies stimulate the respiratory control center in the brain when the blood ________ decreases.
A. pH B. PO2 C. PCO2 D. HCO3- concentration E. hemoglobin concentration