The half-life of carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission) to her laboratory. Her wood sample contained 2 grams of carbon-14. If the age of the wood was determined to be 22,800 years old, how much carbon-14 originally existed in this piece of wood?
A. 16 grams
B. 32 grams
C. 4 grams
D. 8 grams
E. 12 grams
Answer: B
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The drug cytochalasin targets actin filaments in the cytoskeleton, preventing them from forming. Treatment of a cell with cytochalasin would result in its inability to ________.
A. prevent mutations in its chromosome B. form the nuclear envelope structure C. transport substances within the cell D. form cellular extensions
In your classroom aquarium you notice that the fish tend to stay around the rock piles and plants instead of swimming around the open water. Which statement below best explains your observations?
A) The fish are seeking shelter from strong currents. B) Fish use structures in their environment for protection and cover. C) Fish store uneaten food around structures. D) Structures capture heat so the fish use these locations to warm their bodies.
You may have heard through various media of an animal alleged to be the hybrid of a rabbit and a cat. Given that the cat (Felis domesticus) has a diploid chromosome number of 38 and a rabbit (Oryctolagus cuniculus) has a diploid chromosome number of 44,
what would be the expected chromosome number in the somatic tissues of this alleged hybrid? A) 41 B) 38 C) 82 D) 40 E) 44
With ________, there will be more than two genetic alternatives for a given locus
A) multiple alleles B) incomplete dominance C) epistasis D) codominance E) gain of function mutant