Scientists use experiments and observations to make logical conclusions about scientific inquiries. This process is called the _________
Answer: Scientific method
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Dairy cattle were unknown in Thai culture until recently, and 97 percent of Thai people are lactose intolerant as adults. Which explanation for such widespread lactose intolerance is most likely correct?
A) Allergies are becoming more common in humans as more chemicals are being encountered during longer lifetimes. B) Evolutionarily, producing an enzyme to break down a sugar that will never be encountered is wasteful. C) The ability to digest sugar in milk is determined by environment, and most humans are not exposed to milk as a food source beyond childhood years. D) There is no good explanation for this situation in humans.
If the sunflowers represent 2400 calories, how many calories would be lost as heat as you
move from the first to the second trophic level?
a. 240 b. 2160 c. 90 d. 10
Organisms that have been genetically engineered are called ____, because they have been modified to contain genetic
information called a(n) ____ from an external source
a. transgenic; transgene b. transgenic; oncogene c. somatic; Ti plasmid d. genetically modified organisms; restriction fragment length polymorphism e. somatic; transgene
The Krebs cycle takes place in the ____
a. ribosomes b. cytoplasm c. nucleus d. mitochondria e. chloroplasts