What makes it possible for human mitochondria, which have only 22 sequences that code for tRNA, to translate mitochondrial polypeptides that require 32 tRNAs?
What will be an ideal response?
Thanks to the third-base wobble, many of the tRNAs can recognize codons using the first two bases of the codon. In addition, many nuclear genes can be imported into mitochondria and the exchange of genetic information between the nucleus and mitochondria is required for proper mitochondrial function. Therefore, some of the tRNAs are read using these nuclear-encoded tRNAs if the mitochondria do not transcribe those particular tRNAs.
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Plant root nodules are
A) formed from gall-rotting bacteria that decompose plant roots. B) harmful to plants, because the bacteria outcompete the plants for nutrients. C) sites where nitrogen fixation occurs. D) structures created by fungi and are found in all agricultural crops.
An mRNA molecule has a cap attached to its 5' end and a poly-A tail attached to its 3' end
a. True b. False Indicate whether the statement is true or false
Which of the following is a byproduct of photosynthesis?
A) carbon dioxide B) water C) oxygen D) glucose E) energy
Evolutionary adaptations that help diverse animals directly exchange matter between cells and the environment include _____
A) a gastrovascular activity, a two-layered body, and a torpedo-like body shape B) an external respiratory surface, a small body size, and a two-cell-layered body C) a large body volume, a long, tubular body, and a set of wings D) an unbranched internal surface, a small body size, and thick covering