Which of the following is true of composite transposons of bacteria?
A. They are composed of two inverted repeats (IR) flanking a transposase gene.
B. They are composed of two inverted repeats flanking a number of genes for auxiliary proteins that activate or assist transposition.
C. They usually consist of two insertion elements flanking some additional genes. These genes are frequently antibiotic-resistance genes.
D. They replicate via an mRNA intermediate.
E. They only use the inner IR elements when transposing.
C
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Protein sequences consist of how many amino acids?
a. 20 b. 10 c. 5 d. 3
Acacia trees often have ants that live on them. The ants feed on materials produced by special structures called nectaries, which the tree produces. The ants will attack other animals that begin to feed on the tree and will even cut off small branches of other trees that come in contact with "their" tree. The relationship between Acacia trees and ants is called
A. mutualism. B. competition. C. predator/prey. D. parasite/host.
The sophisticated behavior of mammals and birds is directly related to
A) their relatively large cerebrum. B) the presence of a hindbrain. C) their relatively large midbrain. D) the presence of a forebrain.
The process during which a population of organisms changes over many generations to become better adapted to its environment is