Channels present in the membranes of some cells that allow rapid movement of water are called ________.
Fill in the blank(s) with the appropriate word(s).
aquaporins
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The transformation step in creating bacteria genetically engineered to produce human proteins involves:
A. binding of the donor DNA to the vector DNA and renaturing. B. cleaving the donor and vector DNA so they can be bound into a single molecule. C. bacteria taking up the recombinant DNA in the form of the vectors. D. bacteria expressing the novel proteins encoded by the donor DNA. E. None of the answer options are correct.
In addition to carbon dioxide, which of the following are also considered to be greenhouse gases?
A. water vapor and methane B. methane C. oxygen D. water vapor E. methane and oxygen
How many proteins appear to be related to the differences in shell color?
a. 1 b. 2 c. 3 d. 4
During a human pregnancy, implantation occurs at which stage?
a. zygote b. early cleavage c. blastocyst d. gastrula e. embryo