While dining out with an entomologist (insect scientist), you both order mushrooms from the menu. She turns to you and says, “We might as well be eating beetles!” You both laugh, because science jokes are inevitably funny. Why is this statement true?
a. Beetles eat a lot of mushrooms so it is believed they taste the same.
b. The carbohydrates in both beetle and fungus diets are sucrose and maltose.
c. Beetle shells and fungus cell walls are both made of chitin, a modified carbohydrate.
d. It is not very funny because the two share no commonality.
c. Beetle shells and fungus cell walls are both made of chitin, a modified carbohydrate.
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Sutherland discovered that epinephrine signals
A) a decrease in levels of cAMP as a result of bypassing the plasma membrane. B) lower blood glucose by binding to liver cells. C) interactions with insulin inside muscle cells. D) interactions directly with glycogen phosphorylase. E) elevation of cytosolic concentrations of cyclic AMP.
The European corn borer is an insect whose larvae eat corn crops, thus reducing the yield of the crops. Scientists have genetically modified corn in the hopes of making it more resistant to infestation by the European corn borer. Design an experiment to
test whether the genetically modified variety is more resistant to infestation than an unmodified variety. State your hypothesis, and identify your experimental group and your control. What will be an ideal response?
Food infections have incubation periods of days to weeks, whereas the incubation period for food intoxications is hours to days. Please select the true statements that explain this situation.
> In food infections, the microorganism has to grow in the infected human host, producing more toxins as it reproduces. > The elements that cause food intoxications, like arsenic and mercury, are extremely potent in tiny amounts causing a faster disease symptomology. > The gram-positive bacteria, the organisms causing food intoxications, grow much faster than gram-negative bacteria, the organisms causing food infections. > Food intoxications involve the ingestion of exotoxins produced by microorganisms in the food whereas food infections involve the ingestion of the microbial cells themselves.
Ferns produce their spores through meiosis.
Indicate whether the statement is true or false.