Placoid scales are characteristic of class

(a) Cephalaspidomorphi.
(b) Chondrichthyes.
(c) Osteichthyes.
(d) Reptilia.


(b) Chondrichthyes.

Biology & Microbiology

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A total of ______ codons code for ______ commonly occurring amino acids.

a. 20; 64 b. 64; 20 c. 4; 20 d. 20; 4

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Respiration is a physiological process by which O2

enters the internal environment and CO2 leaves by diffusing across a __________. Fill in the blank(s) with the appropriate word(s).

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What is a form of recombination in bacteria that involves the F plasmid?

What will be an ideal response?

Biology & Microbiology

The structure of the Drosophila gene, called Tinman, is similar to a gene in humans that also _____

A) promotes ear development B) specifies the location of the heart C) determines structures in the eyes D) specifies limb elongation points

Biology & Microbiology