How do cytokines function?
A. They bind directly to microbes to enhance their chance of being ingested (phagocytosed).
B. They are secreted in the phagolysosomes of neutrophils to effect killing of ingested microbes.
C.
They are secreted by one cell type. They then bind to a receptor on target cell causing a signal within that cell that turns on (or off) certain genes to achieve a response.
D. They work as a series of serum proteins to produce a hole in microbes to directly lyse them.
C
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Where do terrestrial plants obtain the necessary carbon for photosynthesis?
What will be an ideal response?
Full induction of the lactose operon requires
A. lactose present. B. lactose and glucose present. C. lactose and arabinose present. D. lactose present without glucose.
The complex polysaccharide that provides flexibility to the primary walls of collenchyma cells is called ____
a. cellulose b. lignin c. fiber d. pectin e. cuticle
The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____
A) gains electrons and gains potential energy B) loses electrons and loses potential energy C) gains electrons and loses potential energy D) loses electrons and gains potential energy