Choose the phrase that best represents microevolutionary change.
A. darker skin after hours spent in a tanning booth
B. major episodes of extinction
C. changes in allele frequency in a population
D. new forms of animals replacing older ones
Answer: C
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Which of the following organ systems are NOT involved in temperature regulation or secretions of
hormones?
a. integumentary system b. circulatory system c. muscular system d. skeletal system e. endocrine system
Open reading frames (ORFs) are
1.mRNA molecules. 2.random DNA fragments. 3.possible protein coding regions. 4.cloning vectors. 5.a type of bacteriophage.
There is still some controversy among biologists about whether Neanderthals should be placed within the same species as modern humans or into a separate species of their own. Most DNA sequence data analyzed so far indicate that there was probably little or no gene flow between Neanderthals and Homo sapiens. Which species concept is most applicable in this example?
A) phylogenetic B) ecological C) morphological D) biological
The productivity of an ecosystem
A. can be measured in biomass produced. B. can change depending on the stage of succession. C. is dependent on such abiotic factors as; temperature, water, and sunlight. D. All of these answers are true.