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- 1. Multiple Choice
Salivary amylase is an enzyme in humans that breaks down starches. What substance would humans have difficulty digesting with this enzyme?
lipids
nucleic acids
proteins
carbohydrates
- 2. Multiple Choice
Which best explains why the rate of a biochemical reaction decreases at high temperatures?
The activation energy increases.
The shape of the enzyme changes.
The enzyme-substrate complex forms.
The bonds between substrates are broken.
- 3. Multiple Choice
A contractile vacuole helps protists eliminate excess liquid. This is a "pumping" process which reduces pressure inside the cell and prevents the cell from bursting. What is most likely the source of energy for this process?
DNA
lipids
ATP
ribosomes
- 4. Multiple Choice
What do both prokaryotic and eukaryotic cells contain?
membrane-bound organelles
linear chromosomes
cytoplasm
a nucleus
- 5. Multiple Choice
Which of these cells in the human body is specialized to transport oxygen throughout the body?
- 6. Multiple Choice
What would most likely be produced when a cell with eight chromosomes undergoes mitosis?
two cells with four chromosomes each
two cells eight chromosomes each
four cells with four chromosomes each
four cells with eight chromosomes each
- 7. Multiple Choice
This diagram shows a Paramecium, a unicellular protist. When a chemical is added to the pond water in which the Paramecium lives, the Paramecium stops moving. Which structure is most likely affected?
1
2
3
4
- 8. Multiple Choice
During translation, what does the tRNA deliver to the ribosomes?
amino acids
DNA
mRNA
proteins
- 9. Multiple Choice
Which will most likely cause an increase in the frequency of genetic mutations in humans?
increased exposure to mold spores in the air
increased exposure to rising levels of atmospheric CO2
increased exposure to bacteria in drinking water
increased exposure to X-rays
- 10. Multiple Choice
Identical twin girls are separated at birth and cared for by two different families. After twenty years, the twins have different heights and weights. What is most likely the cause of these differences?
One twin had a genetic condition that prevented her from growing tall.
The DNA of one twin was different from the DNA of the other twin.
Each twin was provided a different diet and physical activities.
The proteins made by one twin were different that the proteins made by the other twin.
- 11. Multiple Choice
Which molecules are joined together to make proteins?
fatty acids
nucleic acids
amino acids
acetic acids
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