A chart that displays paired chromosomes in order of size is a
A) phenotype.
B) genotype.
C) karyotype.
D) genome.
C) karyotype.
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Each cell is able to maintain an internal environment within a range that favors survival. This condition is called
a. metabolism. b. homeostasis. c. physiology. d. adaptation. e. evolution.
What order of events would show how natural selection occurred in a population of lice that could originally be controlled by the chemical permethrin?
A) A louse population evolves resistance to permethrin; permethrin is used to kill lice; lice become more common in schoolchildren. B) Some lice are resistant to permethrin; permethrin is used to kill lice; lice resistant to permethrin become the most common type. C) Permethrin resistance is common in lice; permethrin is used to kill lice; most lice become sensitive to permethrin. D) Permethrin is used to kill lice; individual lice change in order to survive exposure to permethrin; most lice become resistant to permethrin.
A fragile site:a
is found only on the X chromosome. b. occurs in only one of the sister chromatids. c. is associated with cancerous cells. d. is usually not inherited. e. is the result of genomic imprinting.
A "5? cap":
a. prevents translation. b. prevents the binding of ribosomes. c. marks the mRNA for degradation. d. is added to mRNA but not pre-mRNA. e. protects mRNA from degradation.