Chemical bond is formed by sharing of electrons:
a. covalent bond
b. peptide bond
c. atom
Answer: a. covalent bond
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A change in genotype, but not in phenotype, is most likely due to
A. a point mutation in the third position of a DNA triplet. B. a nonsense mutation at the beginning of a gene. C. thymine dimer formation in the coding region of a gene. D. a mutation that leads to a frameshift in the middle of a gene.
A population declines when
A. animals are removed randomly. B. death rate exceeds reproductive rate. C. reproductive and death rates are equal. D. reproductive rate exceeds death rate. E. smaller animals are selectively removed.
The Panamanian golden frog is in decline because of ________, which are being driven by ________.
A. introduced species; increased global trade B. outbreaks of a fungus; deforestation C. outbreaks of a fungus; global climate change D. outbreaks of a virus; global climate change E. outbreaks of a virus; deforestation
An element with more or fewer neutrons than the same element as it appears on the periodic table is known as which of the following?
A) isomer B) ion C) buffer D) isotope