The ______ is a distinguishing feature found in the embryonic stage of all chordates that provides axial support.

a. dorsal hollow nerve cord
b. spinal cord
c. notochord
d. vertebral column


c. notochord

The notochord is a distinguishing feature found in the embryonic stage of all chordates that provides axial support. In vertebrates it is replaced by the vertebral column during embryonic development.

Biology & Microbiology

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You are comparing the events of meiosis I in cells from several different organisms. You come across one species in which you do not observe any chiasmata. The best conclusion to make is  

A.  there is no crossing over between non-sister chromatids B.  kinetochores of sister chromatids do not fuse C.  the chromosome pairs will not assort independently D.  chiasmata will form during meiosis II

Biology & Microbiology

Which of the following organisms are not classified as consumers?

a. Humans b. Trees c. Fungi d. Worms e. Parasites

Biology & Microbiology

Class II MHC molecules are found primarily on

A. macrophages. B. dendritic cells. C. erythrocytes. D. T cytotoxic cells. E. macrophages AND dendritic cells.

Biology & Microbiology

Of the following list, which antibiotics affect protein synthesis?

A. Penicillin B. Ciprofloxacin C. Chloramphenicol D. Tetracycline E. Both tetracycline and chloramphenicol are correct.

Biology & Microbiology