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WorksheetsUnit 3B Quiz #1 Retake
Total questions: 10
Worksheet time: 20mins
The half-life of strontium-90 is 25 years. How many half-lives have past after 100 years?
4
6
8
10
A radioactive substance decays with a half life of 100 years. If the substance is stored for 3 half-lives, then how much of the radioactive substance remains?
1/2, 50%
1/4, 25%
1/8, 12.5%
1/64, 1.56%
Each of the objects have varying amounts of the original radioactive material, X. Which object is likely the oldest?
Granite, 26% of the radioactive material remains.
Basalt, 34% of the radioactive material remains.
Gabbro, 47% of the radioactive material remains.
Pumice, 61% of the radioactive material remains.
How are bacteria becoming resistant to antibiotics?
Some bacteria can purposely change DNA to withstand antibiotics
Some bacteria acquire genetic mutations that allow them to withstand antibiotics.
Some bacteria learn how to avoid antibiotics.
Bacteria picked up the technology to reproduce faster than antibiotics can keep up
The pictures are from different types of animals. What can be said about them that is true?
They all have different bones, which implies that they all share a different ancestor.
They all have different bones, which implies that they all share a common ancestor.
They all have similar bones, which implies that they all share a different ancestor.
They all have similar bones, which implies that they all share a common ancestor.
Explain how the fossil record is evidence for the scientific theory of evolution.
It proves what future species of animals will look like in the future.
It shows that extinct animal have become a fossil through selection.
It shows that extinct species share similarities with current species.
It allows scientist to compare fossils from the past to undiscovered fossils.
Below are the % similarities of DNA between whales and other species. Based on this, which are whales most closely related to?
Pig, 68.4%
Hippo, 83.4%
Mouse, 38.4%
