Match the membrane lipid group on the left with the correct type of membrane lipid on the right.
A) cholesterol
B) cerebrosides
C) triglycerides
D) 24-carbon fatty acids
E) phosphoglycerides
1) phospholipids
2) glycolipids
3) sterols
1. E) phosphoglycerides
2. B) cerebrosides
3. A) cholesterol
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Which of the following have a single, circular chromosome?
a. Archaea b. Bacteria c. both Archaea and Bacteria d. neither Archaea nor Bacteria e. only methanogens
A scientist is building a cladogram for animals. Which of the following is a node that you would expect to find on the cladogram?
a) leg length b) deuterostome development c) feather arrangement d) fur texture
If an enzyme catalyzes the reaction A + B ? C, then
A. the enzyme could also convert A + B to another molecule D. B. the enzyme will also catalyze the reaction C ? A + B C. the enzyme undergoes a conformational change when bound to A and B. D. the enzyme energizes A and B to make them more reactive. E. the active site of the enzyme binds C more tightly than A and B.
In which of the following do the mucous membranes serve as a portal of entry for disease?
A) a pathogen crosses from the mother to the fetus by way of the placenta. B) A person rubs the eye with contaminated fingers and the pathogen is washed into the nasal cavity by way of tears. C) A person is bitten by a mosquito that carries the malaria parasite. D) Fungi digest the outer layer of the skin. E) A person receives an injection with a contaminated needle.