A research project you are doing looks at different protein-encoding genes in the human genome. What are some of the main classes of genes that you will find? (Select all that apply.)A) clusters of two or more distinct genes known as multigene familiesB) transposons that move within or between chromosomesC) single-copy genes that exist once on the genomeD) simple sequence repeatsE) tandem clusters used to increase levels of specific mRNAs
What will be an ideal response?
A, C, E
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The bacteriocins produced by Escherichia coli are called colicins.
Answer the following statement true (T) or false (F)
In the central nervous system, nerves are called
a. reflex arcs. b. nerve tracts. c. nerve pathways. d. neurofibers. e. monosynaptic paths.
__________ provide much of our lumber for building and wood pulp for paper productions.
A. Charophytes B. Gymnosperms C. Bryophytes D. Seedless vascular plants
Langur monkeys and ruminants (such as cows) are the only known mammals in which lysozyme functions in the stomach instead of in tears and saliva. The cow/langur enzyme also has five amino acid changes that are not present in other mammals. What is most likely to be true about lysozyme from langurs and cows compared to lysozyme from other mammals?
A. These five amino acid changes alter the specificity of the enzyme, such that the cow/langur lysozyme attacks viruses instead of bacteria. B. These five amino acid changes somehow make the cow/langur lysozyme resistant to pepsin digestion. C. Salivary and tear lysozyme functions best at a higher H+ ion concentration than the cow/langur enzyme. D. The five amino acids that langurs and cows have in common in their lysozyme were present in the common ancestor of all mammals.