The sequence of amino acids in a protein is based on the ________ of the mRNA
Fill in the blank with correct word.
Answer: nucleotide sequence
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Increased phosphate levels in the Everglades has led to:
A. displacement of native plants by phosphate-loving introduced plants. B. eutrophication followed by declines in fish and alligator populations. C. increased plant growth and diversity. D. expansion of native plants into adjacent ecosystems. E. declining populations of low-phosphate adapted cattails.
All mammals develop a placenta, which provides for exchange of nutrients and wastes
between mother and offspring.
a. True, by definition, mammals have placentas. b. False, some mammals produce eggs. c. True, all mammals have amniotic eggs. d. False, not all mammals nurture their young
In the mammalian heart, the systemic and pulmonary circuits ____
a. carry only oxygenated and deoxygenated blood, respectively b. carry only deoxygenated and oxygenated blood, respectively c. mix during times of stress d. intermix freely e. are completely separate
A physical barrier that separates a population
in half and that leads to the evolution of a new species is called
a. sympatric speciation. b. allopatric speciation. c. directional selection. d. ecological isolation. e. behavioral isolation