If an organism has the same life strategy as a maple tree, the synaptonemal complex will be observed
a. only in alternating generations.
b. in each generation.
c. only in a unicellular haploid phase.
d. only in a multicellular haploid phase.
e. only in gametophyte.
A
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In true fishes, the gills primarily serve which
function? a. gas exchange b. feeding c. water elimination d. both feeding and gas exchange e. all of these
The specialized membrane proteins that actively transport sodium and potassium ions across the plasma membrane are known as the ________
A) sodium-chloride pump B) sodium-manganese pump C) sodium-potassium pump D) sodium pump
In 1928, Frederick Griffith's experiments with Streptococcus pneumoniae suggested that
A) bacteria do not incorporate the DNA of other bacteria. B) attenuated R (rough) bacteria easily revert to the wild type (virulent). C) RNA was the genetic material. D) heat-killed bacteria could somehow "transform" live bacteria. E) protein was the genetic material.
How many chromatids are present in prophase I in a diploid cell in which 2n = 12?
A) 6 B) 12 C) 24 D) 48 E) Can't tell–more information is required.