The bacterial genome often consists of a single chromosome that carries all of the essential genes and one or more varieties of plasmid that generally carry non-essential genes.
a. true
b. false
Ans: a. true
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When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp transcriptional operator. B. trp regulator. C. trp suppressor. D. trp operon. E. trp promoter.
Who is a carrier of an X-linked trait?
a. homozygous dominant female b. heterozygous female c. homozygous recessive female d. homozygous male e. heterozygous male
Plants from both the chaparral and the Arctic have waxy coatings even though the temperatures in the two biomes are vastly different. Why?
What will be an ideal response?
Strictly speaking, mitosis _______________.
A. divides the nucleus and doubles the chromosomal number in the progeny cells B. divides the cytoplasm and doubles the chromosomal number in the progeny cells C. divides the chromosomes within the nucleus into two haploid sets D. divides the nucleus and maintains the chromosomal number in the progeny cells E. maintains the structure of the nucleus, cytoplasm, and chromosomes