What does phylogenetic evidence tell us about protostomes?

A. There was one transition from land to water.
B. There were multiple transitions from land to water.
C. There was one transition from water to land.
D. There were multiple transitions from water to land.


Ans: D. There were multiple transitions from water to land.

Biology & Microbiology

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Match the axoneme structure with its characteristic

A) links adjacent doublets B) generates force to slide microtubules past one another C) complete 13 protofilament microtubule D) project inward at each doublet E) incomplete 10–11 protofilament microtubule 1) A tubule 2) B tubule 3) sidearms 4) radial spokes 5) nexin

Biology & Microbiology

A positive direct ELISA result requires

A. one known antibody, one unknown antibody, and an unknown antigen. B. two known antibodies and one unknown antigen. C. two known antibodies and one known antigen. D. one known antibody, one unknown antibody, and a known antigen.

Biology & Microbiology

Passive ways of crossing a plasma membrane

What will be an ideal response?

Biology & Microbiology

Horizontal gene transfer is less prevalent in eukaryotic species because

A. of the multicellularity in eukaryotic species, which is lacking in prokaryotic species. B. eukaryotic species reproduce by sexual reproduction. C. of the presence of organelles and multicellularity. D. of the presence of organelles in the cells of eukaryotic species. E. of multicellularity and sexual reproduction.

Biology & Microbiology