Which endocrine gland synthesizes melatonin?
A) pineal
B) adrenal cortex
C) thyroid
D) parathyroid
Answer: A
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In many arthropods, body segments have become fused into functional groups called _____.
Fill in the blank(s) with the appropriate word(s).
The genes that play a role in the biological clock code for what specific molecules?
a. nucleotides b. tissues c. proteins d. carbohydrates e. DNA
In reproductive cloning, cells are subjected to an electric current under special circumstances. What effect does this have?
A) It mimics fertilization and begins embryonic development. B) It removes an udder cell from an adult. C) It introduces recombinant DNA. D) It removes DNA from an egg.
Plants are different from all other photosynthetic organisms in that they:
A) have photosynthetic pigments. B) develop from embryos. C) are green. D) are eukaryotic.