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
B
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Many diseases, cancers, and even normal human variations can be caused by mutations and variations in the DNA nucleotide sequence. The most likely immediate result of DNA having a different nucleotide sequence is that
A. the protein resulting from the DNA mutation would be denatured and nonfunctional. B. the peptide bonds in the protein would by hydrolyzed and the protein would fall apart. C. no direct result of change in the protein molecule would occur if DNA is mutated. D. the polypeptide of a protein would be altered. E. the ability for the cell to make proteins would fail.
Hydrogen ion flow out of the thylakoid compartments ____
a. occurs between photosystems I and II b. is called the hydrogen transfer system c. provides energy to produce ATP molecules d. causes excitation of chlorophyll molecules e. requires the intermediary action of acceptor molecules
The most diverse, successful, and familiar group of plants today are the:a
gymnosperms. b. bryophytes. c. ferns. d. angiosperms. e. lycopods.
What is the leading scientific hypothesis explaining how the endomembrane system of eukaryotic cells originated?
A) From the inward folding of the plasma membrane B) From engulfing prokaryotic cells C) From engulfing eukaryotic cells D) From the spontaneous coalescence of phospholipids