A change in chromosome number during
fertilization can lead to
a. sympatric speciation.
b. disruptive selection.
c. directional selection.
d. hybrid sterility.
e. allopatric speciation
A
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Purines and pyrimidines are precursors for synthesis of ________.
A. fatty acids B. peptidoglycan C. nucleic acids D. proteins
Receptor protein-tyrosine kinases add phosphate groups to which amino acid on the receptor?
a. serine b. glycine c. threonine d. tryptophan e. tyrosine
Root systems that are adapted to absorb water and nutrients from the upper layers of soil are called
a. adventitious root systems. b. prop root systems. c. fibrous root systems. d. taproot systems. e. storage root systems.
A confidence interval can be constructed for which of the following population parameters?
A. Population standard deviation B. Population variance C. Population mean D. All of the answers are correct.