Plant cells release hydrogen ions and oxygen from
H2O molecules in
a. photosystem I.
b. photosystem II.
c. cyclic photophosphorylation.
d. light independent reaction.
e. carbon fixation.
Answer:b
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Undifferentiated cells of plants are most likely to be present in which of the following tissues?
A. leaves B. transport systems (xylem and phloem) C. root tips D. flowers
Serovars are strains of a species that have distinctive antigenic properties.
Answer the following statement true (T) or false (F)
A translocation involving chromosome 21 can result in
A. a risk for Down syndrome independent of maternal age. B. a risk for Down syndrome dependent on paternal age. C. no increased risk outside of maternal age. D. lowering the risk of Down syndrome. E. no change in the risk for Down syndrome.
Absolute dating uses _____________ to estimate how old a fossil is
A. Structural features B. Embryonic structures C. Depth within rock layers D. A molecular clock E. Radioactive isotopes