Two proteins that control synapse formation in response to environmental stimuli in early childhood and that when abnormal might lie behind autism are
A) collagen and elastin.
B) insulin and glucagon.
C) neurexin and neuroligin.
D) fibrin and fibrinogen.
C) neurexin and neuroligin.
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Cassie has athlete’s foot. How could you distinguish this fungal infection from a protist
pathogen?
a. Both are eukaryotes. b. Fungi have cell walls. c. Protists are heterotrophs, while fungi are photosynthetic. d. Protists have a nucleoid region, while fungi have a nucleus with DNA.
Four of the five tissues listed below are capable of
cell division. Select the exception. a. cork cambium b. apical meristem c. procambium d. periderm e. vascular cambium
Trace a drop of blood as it enters the vena cava and travels through the heart and body. Include the major vessels and the heart chambers and valves in your answer
What will be an ideal response?
Which of the following substances can easily diffuse across the lipid bilayer of the cell membrane? (Circle ALL that apply.)