When mixed with water, phospholipids spontaneously form membranes because they ________
A) have hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water
B) have hydrophilic fatty acid tails that are attracted to water and hydrophobic phosphate groups that avoid water
C) have hydrophilic heads that are attracted to their hydrophobic tails
D) are both fluid and mosaic
A
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What is the most challenging issue facing genome sequencing?
a. the inability to develop fast and accurate sequencing techniques b. the ethics of using information from genomes at the individual level c. the availability and stability of DNA d. the use of recombinant DNA technology by drug manufacturers
A beaker contains 100 milliliters (mL) of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the result of this mixing?
A) The concentration of Na+ ions will rise. B) The pH of the beaker's contents will increase. C) The pH of the beaker's contents will be neutral. D) The pH of the beaker's contents will decrease.
In harvesting the chemical energy of the molecules in food:
a) organisms can utilize sugars, lipids, and proteins. b) all macromolecules must first be converted into their hydrocarbon chains. c) all macromolecules must first be converted into proteins or free-form amino acids. d) all macromolecules must first be converted into glucose or another simple sugar. e) all macromolecules must first be converted into glucose.
Place the steps of viral replication in the correct order.1. Attachment to host cell2. Entry into host cell3. Synthesis of nucleic acids and proteins4. Self-assembly of nucleocapsids5. Release from host cell
Fill in the blank(s) with the appropriate word(s).