Which lineage includes living members associated with adaptations such as squalene, spiral valve, electroreceptors, lateral line system, and claspers?

a. Actinopterygii
b. Petromyzontoidea
c. Chondrichthyes
d. Sarcopterygii


Ans: c. Chondrichthyes

Biology & Microbiology

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Which of the following is mismatched with regard to similar excellular structures in plant and animal cells?

A) elastins-extensins B) extracellular matrix-cell wall C) collagens-cellulose D) proteoglycans-hemicelluloses E) fibronectins-pectins

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Science is based on the assumption that nature behaves in a ________ and ________ manner.

Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

You would expect the Hox genes of a mosquito and a rabbit to be very _________

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The smallest subatomic particle is the ________.

A. neutron B. isotope C. electron D. proton E. ion

Biology & Microbiology