If a meteor impact or volcanic eruption injected a lot of dust into the atmosphere and reduced the sunlight reaching Earth's surface by 70 percent for one year, which of the following marine communities most likely would be least affected?
A) deep-sea vent
B) coral reef
C) intertidal
D) pelagic
E) estuary
Answer: A
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Increased concentrations of carbon dioxide (CO2) (5% to 10%) and approximately 15% oxygen (O2) produce an environmental condition that best suits which type of organism?
a. Aerobes b. Anaerobes c. Capnophiles d. Microaerophiles
A worker in a cheese-making facility argued that whey, a nutrient-rich by-product of the process, should be dumped into a nearby pond to serve as fish food.Is this a good idea or a bad one, and why?
A. It's a great idea! Let's feed the fish and help them multiply! B. Bad idea-the fish won't be able to eat the whey, so it will sit there rotting and pollute the waters, making them uninhabitable for the fish. C. Bad idea-bacteria would thrive on this rich nutrient source and multiply readily. As they multiply, they'll use the oxygen in the water to harvest the energy from the whey, depleting it. As the oxygen depletes below a certain point, the fish (and perhaps other organisms) will not be able to survive. D. Great idea! This will not only feed the fish, but also microbes and other small organisms. It'll enhance the entire food chain and help all of them!
When impulses are conducted through the heart, transmission is delayed at the __________ so that the
__________ may contract before the __________. a. sinoatrial node; atria; ventricles b. sinoatrial node; ventricles; atria c. atrioventricular bundle; atria; ventricles d. atrioventricular node; ventricles; atria e. atrioventricular node; atria; ventricles
One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU). PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color, eczema, and a "mousy" smell). By detecting PKU early, doctors are able to reduce the effect of this condition with a modified diet. PKU is an example of
a. epistasis b. pleiotropy c. polygenic trait d. codominance e. incomplete dominance