The assisted transport of a molecule across the cell membrane without an expenditure of energy is known as what?
A. osmosis
B. diffusion
C. crenation
D. facilitated transport
E. active transport
Answer: D
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Leaves arise
a. as part of the periderm. b. as part of secondary growth. c. at the nodes. d. as a result of differentiation of cambium cells. e. from the lateral, not the apical, meristem
In the familial form of retinoblastoma, individuals who inherit one mutant allele of the RB1 gene have an 85% chance
of developing retinoblastoma and other cancers. Explain why, when these individuals carry only one copy of the mutant gene, there is such a high incidence of cancer in these RB1 heterozygotes. What will be an ideal response?
The genetic engineering of human-animal hybrids is a routine procedure related to assisted reproductive technologies
a. True b. False
Because oxygen is more electronegative than hydrogen, the water molecule is
A. ionic. B. nonpolar. C. hydrophilic. D. hydrophobic. E. polar.