Scientists unearth a Wooly Mammoth from the Siberian Ice Sheath and discover that a eukaryotic "amoeba"-like cell is still alive. Which component of the cell membrane might contribute to maintaining the fluidity of plasma membranes under freezing conditions?
A. peripheral proteins
B. high levels of long phospholipid tails within the lipid bilayer
C. high levels of unsaturated phospholipid tails within the lipid bilayer
D. absence of cholesterol
E. high levels of saturated phospholipid tails within the lipid bilayer
C. high levels of unsaturated phospholipid tails within the lipid bilayer
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Acromegaly is the result of excessive secretion of which hormone by adults?
a. melatonin b. triiodothyronine c. thyroxine d. testosterone e. growth hormone
Rhizobia help plants meet their __________ by producing __________
a. nitrogen; NH3 b. phosphorus; PO4 c. potassium; K2O d. nitrogen; NO3 e. phosphorus; ATP
Choose the true statement about genome size and gene number in animals.
A. There is a strong correlation between the number of genes and genome size. B. Much of the extra DNA in humans is in the form of exons. C. The pufferfish has a larger genome than humans and more genes. D. Genome size differences depend to a large extent on the amount of retrotransposon DNA present.
Body parts that are similar but have evolved in different lineages due to environmental pressures are called ________
a. morphological convergences b. homologous structures c. analogous structures d. vestigial structures e. morphological divergences