Which characteristic of the light absorbing regions of chlorophylls and carotenoids most likely accounts for the ability
of these molecules to absorb light?
a. ringed structures
b. the presence of aldehyde side-groups
c. the presence of magnesium
d. an extensive network of double bonds
e. long hydrocarbon chain
ANSWER: d
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Which of the following is not an example of facilitated diffusion?
A) GLUT1 glucose transporter B) anion exchange protein C) aquaporins D) channel proteins E) oxygen transport
During which stage of the cell cycle do the chromosomes duplicate?
A. telophase B. prophase C. mitosis D. anaphase E. interphase
The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by which of the following statements?
A) PSI precedes PSII in photosynthesis. B) Electrons are excited by PSI or PSII, but not both. C) Chlorophyll molecules in the reaction centers of PSI and PSII are designated P700 and P680, respectively, to reflect the wavelengths of their light absorption maxima. D) PSII was discovered before PSI. E) Only PSI contains a special pair of chlorophyll a molecules.
The fertilization of an egg by a sperm produces a cell called a/an:
A) oocyte. B) ovum. C) gamete. D) zygote.