If a gene is replaced with a heterologous sequence such that the gene is then nonfunctional, what is the result usually called?
What will be an ideal response?
a knockout
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A high proportion of the food that cattle eat cannot be digested by cattle
a. True, cattle have large saclike pouches that house plant-digesting microbes. b. False, cattle are herbivores and thus produce the necessary enzyme to digest plant material. c. True, this is why cattle have to eat large amounts of food, because most passes undigested through their gut. d. False, cattle eat highly nutritious plants that are readily digested
Lignin is to cellulose strands as __________ is to
epidermal cells. a. cuticulin b. epidermerin c. pectin d. cutin e. chitin
In eukaryotes, the AUG initiation codon is located in the ________ sequence
A) Shine—Dalgarno B) Kozak C) Khorana D) Goldberg—Hogness E) Pribnow
How can freeze-fracture be used to determine the orientation of a protein in a membrane?
A. Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope. B. Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins. C. Freeze-fracture allows a cell to be cleaved in between the lipid bilayer, splitting the plasma membrane into two layers.