The microscopic air sacs or alveoli are the sites where blood
(a) picks up oxygen.
(b) gives up carbon dioxide.
(c) gives up oxygen.
(d) both a and b.
(d) both a and b.
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Conserved arrangements of segments of DNA in related genomes are referred to as
A. synteny. B. homology. C. analogous DNA. D. a contig. E. a comparative genome.
In a sunflower population, a mutation arises that results in vessels 4à— wider than wild-type. The mutants will have _________ water-transport capacity, but will also be more susceptible to _________
A. higher; cavitation from freezing B. higher; cavitation from air leaks C. higher; conduit collapse D. lower; cavitation from freezing
The trait of medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas plants with small leaves are P'P'. A cross is made between two plants each with medium-sized leaves
If they produce 80 seedlings, what would be the expected phenotypes, and in what numbers would they be expected? What is the term for this allelic relationship?
An immature male gametophyte is called a(n) _________.
A. Pollen tube B. Megasporangium C. Pollen grain D. Naked seed E. Ovule