In some mammalian tissues, the mRNAs for proteins such as apolipoprotein-B and glutamate receptors are edited before translation to alter the information encoded in the original genes
What enzymes are responsible for this editing, and what do they do?
What will be an ideal response?
Ans: The enzymes responsible for RNA editing in these genes are cytidine and adenosine deaminases. These enzymes deaminate the nucleotide base of certain nucleotides, such as altering a C to a U or an A to an I (inosine).
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B cells have antigen receptors that bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells. T cells have antigen receptors that _____
A) are active only in lymph nodes B) bind only to antigens present on the surface of the invading or foreign cells C) bind only to freely dissolved antigens in the plasma D) bind to antigen fragments presented on major histocompatability (MHC) complexes by host cells E) bind to antigens that are either freely dissolved or present on the surface of invading or foreign cells
What may have been a site for the synthesis of organic molecules on the early Earth with its source of hot water and metal ions from rocks?
a. dried-out mud flats b. stratified mica crystals c. deep sea hydrothermal vents d. the bottoms of tidal pools e. pockets in lava beds
In the flowering plant life cycle, into what
strucures do microspores directly develop?
a. male gametophytes b. megaspores c. sperm d. zygotes e. male sporophytes
Which type of active transport is illustrated here?
1.Antiport
2.H+ pumped against its gradient
3.Symport
4.Uptake of cations