List several differences between insects and spiders.
What will be an ideal response?
Insects Spiders
3 pairs of walking legs 4 pairs of walking legs
1 pair of antenna 0 antenna
1 pair of mandibles 0 mandibles (true)
Compound eyes No compound eyes
Head, thorax, & abdomen Cephalothorax & abdomen
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A new serotype of Vibrio cholerae, V. cholerae 0139, has picked up the ability to produce
A. pili. B. flagella. C. capsules. D. toxin.
The difference between diffusion and passive transport is that during diffusion molecules move ________ and in passive transport they move ________
a. through passive transporters / across the lipid bilayer b. down concentration gradients / up concentration gradients c. through active transporters / through passive transporters d. across the lipid bilayer / through passive transporters
Cells with gap junctions are typical of tissues
a. that suffer wear, abrasion, and mechanical insults. b. such as bone and cartilage that must withstand external forces. c. that require rapid exchange of chemical messages, as is the case for cardiac muscle. d. that secrete enzymes or hormones. e. described by all of these.
Single-strand binding proteins prevent the hydrolysis of single-strand regions of DNA by nucleases
__________________ Indicate whether the statement is true or false.