In light-dependent reactions, hydrogen ions are transported into the thylakoid membrane. What drives the
movement of these ions?
a. passive diffusion of ions from high to low concentration
b. passive diffusion of ions from low to high concentration
c. active transport of ions driven by the hydrolysis of water into oxygen
d. active transport of ions driven by energy from the electron transport chain
e. active transport through the enzyme ATP synthase
ANSWER: d
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Which of the following statements best compares the two dominant lineages of modern angiosperms?
A. Monocots have only one pistil per flower whereas eudicots have three. B. Monocots have only one cotyledon whereas eudicots have two. C. Monocots are lycophylls whereas eudicots are euphylls. D. Monocots have only one stamen per flower whereas eudicots have six. E. Monocots are monophyletic whereas eudicots have multiple origins.
In humans, which cell does NOT have a nucleus when mature?
a. erythrocytes b. lymphocytes c. neutrophils d. eosinophils e. monocytes
The acidic nature of the fluid around active tissue is the result of ____
a. falling levels of oxygen b. falling DPG levels c. rising levels of carbon dioxide d. increased iron concentration e. increased blood pressure
The body of a fungus has several characteristics. One of these is their hyphae, long chains of cells. Which of the following statements best describes the nature of septa and cross walls?
A. Septa form cross walls between the long chains of cells that make up hyphae. B. Septa of the cross walls are formed on the outside of fungal cells and give the fungal body more rigidity. C. Spores of fungi that are formed within reproductive structures have cross walls separated by septa. D. The cross wall within the nuclear membrane of every fungal body forms septa. E. Cross walls are responsible for the formation of spindle plaques within the hyphae after the septa are produced.