________ is a predator that bores a hole through the outer membrane of its gram-negative bacterial prey and then reproduces in the periplasm.
A. Vampirococcus
B. Daptobacter
C. Syntrophobacter
D. Bdellovibrio
Answer: D
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Bases are compounds that do all the following except
a. they bind hydrogen ions. b. they release hydrogen ions. c. they are pH 7 or above. d. they contain more hydroxide ions than hydrogen ions. e. they raise pH.
Which of the following is one of Chargaff’s
rules about DNA structure?
a. phosphate groups are connected to sugars by covalent bonds b. base pairs connect to each other by hydrogen bonds c. the amounts of adenine and thymine are the same as are the amounts of cytosine and guanine d. the DNA molecule forms into a double helix e. the strands in a DNA molecule run in opposite directions
Spiders use hydraulic pressure for all of the
following EXCEPT to a. oppose the contraction of their leg muscles. b. extend their hind legs outward. c. assist in jumping. d. pump blood into body tissues. e. compensate for their lack of opposing leg muscles.
The primary function of spongy mesophyll is:
a. photosynthesis. b. transpiration. c. to allow diffusion of gases. d. transport of substances. e. transport of water.