While snowshoeing through the winter woods, you stop to look at a tree branch pictured at the right. Specifically, what are the brown structures hanging from the branch?
What will be an ideal response?
Female (seed) cones.
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Companion cells load most of the carbohydrates into sieve tube members ____
a. through plasmodesmata b. by osmosis c. by antiport
d. through carrier proteins e. by symport
Fructose and galactose both have six carbon atoms, twelve hydrogen atoms and six oxygen atoms, just like glucose. A friend of yours says: "Since those sugars have the same number of atoms, they should have the same name." You answer: "While they do have the same number and type of atoms,
A. they are named differently because of their quaternary structures, which is very important in carbohydrates, especially glucose." B. they are all polysaccharides and have slightly different functions within organisms and therefore have different names." C. they are named differently because they are involved in different DNA nucleotide formation." D. they are named differently because when heated above their optimal temperature they become denatured and will not react with their substrates." E. they are named differently because they are alternate forms of the monosaccharide, glucose."
Plants can most readily utilize the ________ form of nitrogen
A) nitrous oxide B) N2 C) amino D) nitrate
Shortly after returning from a trip to several continents, a young man experiences episodes of fever, chills, muscle aches, and headache that recur at irregular intervals. The young man reports carrying only a large backpack and commonly staying in hostels along the way while traveling. Which of the following diseases is he likely to have?
A) anaplasmosis B) scrub typhus C) louse-borne relapsing fever D) Lyme disease E) yaws