The formation of the fertilization envelope requires an increase in the availability of _____
A) calcium ions
B) hydrogen ions
C) potassium ions
D) sodium ions
A
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The interactions and exchange of energy between all feeding levels is known as a ________
A) food web B) feeding frenzy C) trophic level D) food succession
Which of the following groups are considered chordates but are lacking the vertebral column trait?
A. cephalochordates & chondrichthyes B. urochordata & cephalochordates C. sea squirts & chondrichthyes D. osteichthyes & urochordata
Liver cells, mammary cells, and skin cells all contain the same genome; however, their respective proteomes vary drastically. This observation is best explained by what phenomenon?
A. cell division B. crossing over C. evolution D. gene splicing E. cell differentiation
A nucleotide consists of a phosphate group, a molecule of sugar, and a __________________, all linked together by covalent bonds.
A) polypeptide B) triglyceride C) nitrogen-containing base D) sugar-containing base E) phosphorus-containing base