Aquaporins are specific channel proteins that allow for the movement of ______ across a selectively permeable membrane
Fill in the blank(s) with the appropriate word(s).
water
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The osmoregulatory/excretory system of an insect is based on the operation of _____
A) protonephridia B) metanephridia C) Malpighian tubules D) nephrons E) ananephredia
In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only redeyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were
a. Xw+Xw+; XwY. b. Xw+Xw; XwY. c. XwXw; Xw+Y. d. Xw+Xw; Xw+Y. e. XwXw; XwY.
During DNA replication in E. coli, what is the role of DnaA?
A) DnaA is a region of DNA recognized by the replisome where replication is initiated. B) DnaA bends DNA, hydrolyzing the hydrogen bonds in the 13-mer region of oriC and creating an open complex. C) DnaA is a helicase that uses ATP to hydrolyze hydrogen bonds and separate DNA strands. D) DnaA carries the helicase protein to the open region of DNA where hydrolysis and strand separation will occur. E) DnaA prevents reannealing of the separated strands so replication can proceed.
The occurrence of transformation in Archaea
a. has yet to be observed. b. is similar to that found in Bacteria. c. is very different from what is normally observed in Bacteria. d. can be either similar to or different from that found in Bacteria, depending on the particular archaeon.