Most mineral ions that plants need are moved into the ____
a. symplast via active transport
b. transmembrane pathway via bulk flow
c. apoplast via facilitated diffusion
d. symplast via facilitated diffusion
e. the apoplast via bulk flow
ANSWER: a
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You discover a new bird species, but so far have only observed ten nesting females. The female birds are small and mostly brown, with a bit of red around their tails and throats. After the eggs hatch, you perform genetic tests which reveal that all chicks within a nest share the same father, but some chicks across nests also share a father. Based on this, what would you predict about the males of this species?
A. They are larger than the females with more coloration. B. They appear very similar to the females. C. They are smaller than the females with less coloration. D. They are similar in size to the females with more coloration.
Which of the following can be found in a plant cell, but not an animal cell?
a. mitochondria b. nucleus c. chloroplast d. Golgi body
When Peter Agre and colleagues compared frog oocytes expressing aquaporin with control oocytes lacking aquaporin placed in pure water, they found that
A) the control oocytes lacking aquaporin swelled and burst as water was transported into the cells. B) the oocytes expressing aquaporin swelled and burst as water was transported into the cells. C) the oocytes expressing aquaporin collapsed as water was transported out of the cells. D) the oocytes expressing aquaporin first swelled and then collapsed as water was transported into and then back out of the cells. E) the oocytes expressing aquaporin first collapsed and then swelled as water was transported out and then back into the cells.
Which of the following statements is not true?
A. A cell will temporarily decondense its chromatin to give proteins rapid, localized access to specific DNA sequences. B. When a cell divides, its chromatin structures will typically be inherited by its daughter cells. C. A cell can permanently condense and silence an entire chromosome during development. D. A cell will temporarily decondense its chromatin to silence genes during differentiation. E. A cell will temporarily decondense its chromatin to allow access to specific DNA sequences for replication, repair, or gene expression.