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

Biology & Microbiology

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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?

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The genetic engineering of human-animal hybrids is a routine procedure related to assisted reproductive technologies

a. True b. False

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Because oxygen is more electronegative than hydrogen, the water molecule is

A. ionic. B. nonpolar. C. hydrophilic. D. hydrophobic. E. polar.

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