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.

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology

An immature male gametophyte is called a(n) _________.

A. Pollen tube B. Megasporangium C. Pollen grain D. Naked seed E. Ovule

Biology & Microbiology