The structures of porin proteins in bacterial membranes and mitochondrial and chloroplast outer membranes is atypical for multipass integral proteins,

because the porin transmembrane region is composed of a ________ instead of ________ transmembrane segments as in bacteriorhodopsin.
Fill in the blank with correct word.


Answer: β-barrel (cylindrical β-sheet); α-helical

Biology & Microbiology

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What is the distribution of phenotypes from a cross of purple tall pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white; tall is dominant to dwarf.)

A. 63 purple tall; 28 purple tall; 27 white dwarf; 7 white dwarf B. 132 purple tall; 138 white dwarf C. 54 purple tall; 6 white dwarf D. 100% purple tall E. 27 purple dwarf; 28 purple tall; 31 white dwarf; 29 white tall

Biology & Microbiology

When tumor suppressor genes are ____ this significantly increases the chance of a woman getting cancer.

a. over-expressed b. under-expressed/deleted c. expressed d. all of the above

Biology & Microbiology

Which antibody class is most prevalent in the bloodstream?

A. IgE B. IgD C. IgM D. IgA E. IgG

Biology & Microbiology

When making functional form choices to alleviate an interpolation/extrapolation identification challenge the justification will almost always take what form?

A. A p-value from a test statistic B. A hypothesis test C. Theoretical argument D. A calculation of difference of means across sub-samples of the data

Biology & Microbiology