Human DNA can be replicated quickly because it has many
A) replication forks.
B) genes.
C) chromosomes.
D) histones.
A) replication forks.
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The E. coli lac operon encodes three genes. These genes
a. cleave lactose into glucose and galactose, produce transacetylase, and actively transport lactose into the cell. b. encode for an enzyme that cleaves glucose, a transport protein for active transport, and a transacetylase enzyme for solubilizing lactose in the cytosol. c. encode for an enzyme that cleaves lactose, a transport protein for active transport of lactose, and a transacetylase enzyme whose function is still unknown. d. catalyze the synthesis of lactose from glucose and galactose, produce transacetylase, and actively export lactose from the cell. e. directly interact with the lac repressor and initiate their own transcription.
Which process will break apart a large substance into smaller molecules?
a. Metabolism b. Hydrolysis c. Development d. Condensation e. Reproduction
Epigenetic modifications _____
a. are considered evolutionary b. are completely reset during development c. alter the DNA sequence d. can persist for generations e. respond less rapidly to environmental changes than altering the DNA sequence
If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________
A) first line of defense B) first and second lines of defense C) second line of defense D) third line of defense