Early biologists classified living things into two kingdoms. Many biologists today recognize
__________ kingdom(s).
a. one
b. two
c. three
d. six
e. twelve
D
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When biological membranes are frozen and then fractured, they tend to break along the middle of the bilayer. The best explanation for this is that _____
A) the integral membrane proteins are not strong enough to hold the bilayer together B) water that is present in the middle of the bilayer freezes and is easily fractured C) hydrophilic interactions between the opposite membrane surfaces are destroyed on freezing D) the carbon-carbon bonds of the phospholipid tails are easily broken E) the hydrophobic interactions that hold the membrane together are weakest at this point
Explain why most iron-oxidizing bacteria are obligately acidophilic, and discuss some of the environments where these organisms are found
What will be an ideal response?
A particular type of common water snake is only found on islands in Lake Erie. This represents a
A. recessive trait. B. genetically distinct population. C. clone. D. hybrid.
The genera ________ and ________ are amoebic human parasites that cause gastrointestinal and brain infections, respectively
a. Entamoeba / Giardia b. Entamoeba / Naegleria c. Naegleria / Entamoeba d. Naegleria / Giardia