Which of the following statements are correct?

I) Hormones often regulate homeostasis through antagonistic functions.
II) Hormones of the same chemical class usually have the same function.
III) Hormones are secreted by specialized cells usually located in exocrine glands.
IV) Hormones are often regulated through feedback loops.
A) only I and II
B) only II and III
C) only I and III
D) only III and IV
E) only I and IV


Answer: E

Biology & Microbiology

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Which one of the following incorrectly pairs a vertebrate group with its major evolutionary innovation?  

A.  Amphibians—paired lateral fins B.  Dinosaurs—bipedalism C.  Placoderms—jaws D.  Sharks—teeth E.  Ostracoderms—cartilaginous endoskeleton

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In translation the joining of amino acids is catalyzed by the enzyme ____

a. RNA polymerase b. reverse transcriptase c. peptidyl transferase d. polyadenylase e. aminoacyl-tRNA synthetase

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The zone that has no light is called the ________ zone.

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

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Which of the following is NOT a characteristic of

viruses? a. Contains DNA or RNA genetic material. b. Contains cytoplasm and ribosomes. c. Has a protein coat. d. Can only replicate inside a living host cell. e. Is very small.

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