Which character would allow you to identify something as an echinoderm and not a chordate?

A. Dorsal hollow nerve cord
B. Radial symmetry
C. Pharyngeal gill slits
D. Post-anal tail


Ans: B. Radial symmetry

Biology & Microbiology

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Which of the following is true regarding cell

membrane proteins? a. All are free to move laterally through the lipid bilayer. b. All are rigidly positioned. c. Some are tethered by cytoskeletal elements. d. Some form complexes. e. Some are tethered by cytoskeletal elements, and some form complexes.

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________ is the source of the oxygen gas released by a photosystem

A) H2O B) Chlorophyll a C) CO2 D) C6H12O6

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If mitosis makes somatic cells, what does meiosis make?

A) Sex cells B) Heart cells C) Nerve cells D) Body cells

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Triplet on tRNA

(A) Nonsense codon (B) Anticodon (C) Ribosome (D) Exon (E) Poly-A tail

Biology & Microbiology