Humans have ___ symmetry and are ___
a. radial--protostomes
b. radial-deuterostomes
c. bilateral--deuterostomes
d. bilateral-protostomes
e. biradial-deuterostomes
C
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The specificity of certain rhizobia to infect only particular plants is in part due to the
A) abundance of nutrients present in the soil. B) nifH genes they possess. C) rhizobial lipids that act as signaling molecules. D) season (time of year).
Phosphatases are a family of enzymes that specifically remove phosphate groups from proteins that were added by protein kinases. Vanadate is an inhibitor of phosphatases in eukaryotic cells
What effect would vanadate have on the response of cells to signals received by receptor kinases? A. The response of the cell would last longer than it normally would. B. The response of the cell would be shorter than it normally would. C. The signal would still bind the receptor, so there would be no effect.
Which of the following is closest to a micrometer in size?
A) the width of a strand of DNA B) the length of a plant cell C) the length of a chicken egg D) a typical prokaryotic cell E) the size of a ribosome
During what part of the M phase are chromatids separated and sorted so that each daughter cell eventually receives the same complement of chromosomes?
What will be an ideal response?