Sketch and label a cross-section through the human skin. Describe two differences that would occur if the skin were
exposed to UV radiation. What will be an ideal response?
The sketch should resemble Fig. 40-1. Exposure to UV radiation would cause the epidermis
to thicken and melanin production to increase.
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What is the relationship between operons and transcription units?
a. They are two terms for the same thing. b. An operon is made up of a transcription unit and associated regulatory DNA sequences. c. A transcription unit is made up of an operon and associated regulatory DNA sequences. d. An operon is comprised of multiple transcription units. e. A transcription unit is comprised of multiple operons.
The importance of crustose calcareous algae on a coral reef is that they:
a. provide food for corals. b. prevent settlement of larvae. c. cement bits of rubble in the process of reef formation. d. are a major source of food for reef dwellers. e. create habitat for juvenile fish.
Which of the following is a zone of decomposition?
A) forest canopy B) photic zone C) forest floor D) kelp forest
Define an ecological footprint.
A. the amount of land a person needs to provide a place to live B. the amount of energy a person needs to meet his/her needs C. the amount of water a person needs to meet his/her needs D. the total amount of resources used by an individual to meet his/her needs E. the amount of food a person needs to eat