Which structure has cilia that create water currents
and mucous sheets that capture nutrients suspended
in the water in filter-feeding chordates?
a. notochord
b. differentially permeable membrane
c. filiform tongue
d. gill slits
e. jaw
Answer: d
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Evidence that sleep has an inherited component is that
A) MZ twins share more sleep characteristics than do DZ twins. B) siblings often go to sleep and wake up at the same time. C) people with insomnia have the same chromosome abnormality. D) DZ twins share more sleep characteristics than do MZ twins.
Which of these statements about snakes is false?
a. All snakes are carnivores. b. All snakes use internal fertilization. c. All snakes are venomous. d. All snakes have flexible skull bones and hinged jaws. e. Some snakes retain skeletal remnants of hindlimbs.
When a mouse cell and a human cell with different cell-surface protein markers are fused using polyethylene glycol (PEG) and immediately placed at 0°C, what would you expect happens to the mouse and human marker proteins?
A) Both the mouse and human marker proteins will rapidly disperse evenly throughout the fused membrane. B) Only the mouse cell marker proteins will disperse throughout the fused membrane; the human marker proteins will remain confined to the original human region of the fused membrane. C) The mouse and human markers will migrate to opposite poles of the fused membrane. D) The mouse and human markers will migrate little and remain confined to their original membrane regions. E) Both mouse and human markers will be endocytosed by the fused cell and destroyed in the fused cell.
The various taxonomic levels (for example, phyla, genera, classes) of the hierarchical classification system differ from each other on the basis of _____
A) how widely the organisms assigned to each are distributed throughout the environment B) their inclusiveness C) the relative genome sizes of the organisms assigned to each D) morphological characters that are applicable to all organisms