One cell sends second messengers to another cell through gap junctions. What type of signaling would this be considered?
A. paracrine
B. autocrine
C. endocrine
D. direct contact
E. synaptic
Answer: D
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When turns are removed from a closed-circular DNA, the DNA may become:
A. overwound and supercoils will result. B. underwound and supercoils will result. C. underwound or overwound, depending on the sequence of the DNA. D underwound, but this form is unstable and typically reverts to the relaxed state. E. overwound, but this form is unstable and typically reverts to the relaxed state.
A microtubule-organizing center (MTOC)
A) contains centrioles in plant cells. B) serves as a site for both microtubule and intermediate filament assembly. C) anchors either end of cytoplasmic microtubules. D) anchors only the minus ends of cytoplasmic microtubules. E) usually is positioned near the cell membrane.
Describe endotoxins and exotoxins. What effects do they each have on infected persons? What will be an ideal response?
What is significant about cephalization?
A. The division of body parts allows repetition of important structures. B. A concentration of sensory organs allows better detection of threats for motile organisms. C. It allows animals to be triploblastic. D. It is the basis for radial symmetry.