2-7-12
#1. The outer layer of human skin is the epidermis. The waxy outer layer of a plant’s leaf is the cuticle. What major function do human skin and a plant leaf’s cuticle share?
F. oxidation
G. protection
H. respiration
I. variation
2-8
#2. Hepatitis is a disease that damages liver cells. Once the disease is in remission, the liver cells can be replaced and full function can be restored. Which of the following mechanisms does the body use to replace the damaged liver cells?
- New cells are created through cell division
- The existing healthy cells expand and grow larger
- The existing liver cells change to adapt to the new environment
- New cells are created through sexual reproduction
2-9
#3 Ozone is a molecule composed of three oxygen atoms. The ozone layer in Earth’s stratosphere filters UV radiation from the Sun. Scientists have identified a number of different compounds that destroy the ozone in this layer of the atmosphere. What would be the most likely result of continued depletion of the ozone layer?
A. An increase in earthquake activity
B.An increase in stability of marine ecosystems
C. An increase in skin cancer among humans
D. An increase in greenhouse gas concentrations
2-10
4. A researcher has developed a new explosive that cannot be detected by traditional methods, such as using x-ray scanners or bomb-sniffing dogs. Which of the following should the researcher do prior to widely distributing the new explosive?
A. post his procedure for making the explosive on a website so that other researchers can replicate it
B. sell the formula for the explosive to the highest bidder
C. register a patent for the explosive with the government
D. notify the government so they can take measures to ensure the safety of the general public
2-13
#5. What can scientists determine about horses by examining fossils of horses that lived in other geologic times?
A. The changes that have occurred in horses over long periods of time
B.The color of skin horses had in the Mesozoic era
C. The increase in intelligence of horses over millions of years
D. The way that horse behavior has evolved in response to changing conditions