A primary function of carbohydrates attached to the glycoproteins and glycolipids of animal cell membranes is to _____
A) facilitate diffusion of molecules down their concentration gradients
B) actively transport molecules against their concentration gradients
C) maintain the integrity of a fluid mosaic membrane
D) maintain membrane fluidity at low temperatures
E) mediate cell-cell recognition
Answer: E
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Restriction enzymes have proved so useful in manipulating DNA because
A. they cut at defined sites. B. the sticky ends make it very easy to allow recombination of any type of DNA. C. they protect eukaryotes against virus attack. D. they cut RNA molecules. E. they cut at defined sites AND the sticky ends make it very easy to allow recombination of any type of DNA.
Under ideal conditions, how many copies of all the sequences of the host genome should be represented in a genomic library?
What will be an ideal response?
Which of the following is not a characteristic of parenchyma cells?
a. They all lack the ability to photosynthesize. b. They can differentiate into other kinds of cells in response to an injury to the plant. c. They may contain various storage materials, such as starch grains, oils, or water. d. They must be living cells in order to function. e. They may secrete substances of various types.
Antisense nucleic acids interfere with protein synthesis.
Answer the following statement true (T) or false (F)