Why is the goose rolling a beer can back to her nest?
a. She's a silly goose.
b. She's using the beer can as part of the nest border to protect the eggs.
c. She's trying to get nutrition from any source she can.
d. She's exhibiting a fixed action pattern that directs her to retrieve any item that even vaguely resembles an egg.
e. She's a first-time mother and is in the process of learning the difference between eggs and non-eggs.
Answer: d. She's exhibiting a fixed action pattern that directs her to retrieve any item that even vaguely resembles an egg.
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Over generations in a population, traits seen in individuals with higher fitness values will
A. become less prevalent in the population. B. become more prevalent in the population. C. stay at the same frequency in the population. D. decrease the population's mean fitness.
The function of helicase enzymes is to
a. break hydrogen bonds and unwind the two strands of the DNA molecule prior to replication. b. rewind the two DNA molecules after replication. c. remove bases that might have been inserted incorrectly. d. seal new short stretches of nucleotides into one continuous strand. e. fragment old DNA that is no longer of use to the cell
Stacy has a dog that has a tumor on its back leg. This means the _______________
a. dog has cancer b. dog has an abnormal mass of cells c. cells are metastasizing d. dog has been exposed to a carcinogen
Which of the following types of radioactive particle has the highest LET?
a) Alpha particle b) x-ray c) gamma-ray d) proton