The chemical structure of chlorophyll is based on a complex organic ring structure, with a long hydrophobic side
chain and a(n) ____ atom in the center of the ring.
a. carbon
b. manganese
c. magnesium
d. iron
e. nitrogen
ANSWER: c
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The fact that Salmonella has a high ID50 means that
A. it is more pathogenic than 50% of all gut microbes. B. an antibiotic dose of 50 ?g/ml can be expected to kill the organism. C. the most stringent decontamination measures must be used in food preparation facilities. D. consuming just a few cells of Salmonella will not result in illness.
Even though rocky shores are subject to some of the same abiotic factors as sandy beaches, such as changes in temperature and salinity, the species diversity is much higher in the former than the latter. What other variables do you think contribute to this high species diversity in the rocky intertidal?
What will be an ideal response?
What is the term given to the theory which put forth the idea that living organisms could arise by incubating nonliving components?
A) preformation B) spontaneous generation C) evolution D) collective combination E) natural selection
With which of the following would hemizygosity most likely be associated?
A) incomplete dominance B) X-linked inheritance C) sex-limited inheritance D) autosomal dominance E) codominance