Tooth like scales found on sharks and rays

A) placoid
B) ganoid
C) ctenoid
D) cycloid


Answer: A) placoid

Biology & Microbiology

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In order to add a single amino acid to a growing polypeptide chain, a total of ________ molecules or ATP of GTP are utilized.

A. three B. six C. two D. four

Biology & Microbiology

Deposits of shells from ancient _____ are mined as chalk and limestone

a. dinoflagellates c. radiolarians b. diatoms d. foraminiferans

Biology & Microbiology

Which of the following organisms employs a

contractile ring during cell division?

a. bears b. humans c. roses d. pigs e. more than one of these

Biology & Microbiology

If a pedigree of several generations shows only females affected by a particular trait, it cannot be a(n) ____ trait

a. autosomal recessive b. autosomal dominant c. Y-linked d. X-linked recessive e. X-linked dominant

Biology & Microbiology