Approximately how many gene products are involved in the synthesis of melanin in humans?
a. 10
b. 25
c. 50
d. 100
e. 1000
ANSWER: d
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Which of the following relationships is INCORRECT?
A. maternal effect genes activate gap genes B. gap genes activate pair-rule genes C. pair-rule genes regulate segment polarity genes D. segment polarity genes regulate pair-rule genes E. maternal effect genes activate pair-rule genes
Which of the following describes an organ?
a. groups of similar cells that perform specialized functions b. composed of at least two types of tissues c. structure that contains DNA d. a thin bilayer that separates individual cells
The molting hormone of arthropods is:
a. corticotropin b. MSH c. oxytocin d. ecdysone e. adrenalin
Which of the following is not an
environmental cue for plants? a. Length of night. b. Temperature. c. Earth’s magnetic field. d. Presence of pathogens. e. Gravity.