You make a phospholipid bilayer with short, saturated hydrocarbon tails. You measure the permeability of this membrane to oxygen. You then double the length of the hydrocarbon tails and remeasure membrane permeability. You then double the length of the hydrocarbon tails again and make a third measurement of membrane permeability. You graph membrane permeability as a function of hydrocarbon tail length. Which of the accompanying graphs best represents the data you expect?

a.) Horizontal line
b.) Positive slope
c.) Bell shape
d.) Negative slope


Ans: d.) Negative slope

Biology & Microbiology

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Early failures of gene therapy included two children who developed ____________________ after receiving gene therapy for X-linked SCID

Fill in the blank(s) with correct word

Biology & Microbiology

Enzyme used to position nucleotides during DNA replication

(A) DNA ligase (B) DNA polymerase (C) RNA polymerase (D) Restriction enzyme (E) Reverse transcriptase

Biology & Microbiology

Which of these is not a major pathway by which ATP is consumed/used?

a. Synthesizing protein from amino acids b. Breaking down glycogen to glucose c. Transporting sodium out of a cell, from a low to high concentration d. Contraction of heart muscle

Biology & Microbiology

Why might the cricket genome have eleven times as many base pairs as that of Drosophila melanogaster?

A) Crickets have higher gene density. B) Drosophila are more complex organisms. C) Crickets must have more noncoding DNA. D) Crickets must make many more proteins.

Biology & Microbiology