Four of the following are trends associated with vertebrate evolution. Which one is the exception?
a. conversion of the support for locomotion from the notochord to the vertebral column
b. expansion of the nerve cord to form the brain and spinal cord
c. changes in the respiratory system from gills to lungs with accompanying changes in the circulatory system
d. the development of fewer, more efficient chambers in the heart
e. modification of limbs that allowed for more efficient movement
ANSWER: d
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A phylogenetic species comprises ____
a. populations that share a recent evolutionary history b. individuals that share a recent evolutionary history c. interbreeding populations that are reproductively isolated d. individuals that share measurable traits that distinguish them e. one large gene pool subdivided into local populations
Caley, a 30-year-old nurse at Bethson Hospital, is diagnosed with a brain tumor. Caley's doctor presents her with multiple treatment options. Which of the following treatment options is most likely to damage Caley's healthy cells in addition to the cancer cells?
A) Chemotherapy B) Surgery C) Liquid biopsy D) Tyrosine kinase inhibitors
Which element is LEAST likely to be an abiotic factor that can affect community structure?
a. sunlight b. rainfall c. cloud cover d. decomposing organic matter e. temperature
The formation of the bivalent during meiosis
A. contributes to the genetic diversity of a species. B. ensures that the resulting haploid cells will have the same combination of homologous chromosomes as the original diploid cell. C. occurs during meiosis I and meiosis II. D. aids the alignment of sister chromatids in a single row along the metaphase plate. E. is required for the pairing of homologous chromosomes.