The phospholipid molecules of most membranes have a ____

a. hydrophobic head and a hydrophilic tail
b. hydrophilic head and a hydrophobic tail
c. hydrophobic head and two hydrophobic tails
d. hydrophilic head and two hydrophobic tails
e. hydrophilic head and tail


d

Biology & Microbiology

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A transgene is best described as  

A.  hard to destroy once inserted into a genome. B.  hard to study because of its transposons. C.  created by several of the DNA motifs. D.  an inserted foreign gene. E.  a result of endosymbiosis.

Biology & Microbiology

For eukaryotes, translation takes place in the _____

a. nucleus b. nucleolus c. cytoplasm d. plasma membrane e. nucleus and cytoplasm

Biology & Microbiology

The movement of materials from the lumen to the blood or lymph is ____

a. motility b. secretion c. digestion d. absorption e. elimination

Biology & Microbiology

Which was NOT discussed as a way to control HIV's threat to humans?

A. By utilizing theory about evolutionary trade-offs B. By learning more about how similar viruses affect dogs C. By learning more about a rare mutant human allele D. By administering multiple drugs at once to an infected person

Biology & Microbiology