To produce a mutation in a specific E. coli gene, an engineered fragment of DNA in which sequences from each end of that gene flank an antibiotic resistance gene
A) is transformed into cells and replicates independently of the genomic DNA because it has a centromere.
B) is transformed into cells and maintained as a plasmid.
C) is introduced into cells and transposes into the bacterial gene.
D) is introduced into cells and undergoes homologous recombination with the bacterial gene.
D) is introduced into cells and undergoes homologous recombination with the bacterial gene.
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In the development of an oocyte, meiosis is
halted twice. What are those two phases of meiosis?
a. prophaseI and metaphase I b. prophaseII and metaphaseII c. metaphase I and prophase II d. prophase I and metaphase II e. prophase I and anaphase II
Bile
a. has no effect on digestion. b. helps in the digestion of fats. c. helps in the digestion of carbohydrates. d. helps in the digestion of proteins. e. helps in the digestion of nucleic acids
________ acts on proteins to produce peptides which are later broken down into ________ in the small intestine.
A. Pepsin; fatty acids B. Pepsin; amino acids C. Salivary amylase; amino acids D. Maltase; glucose
What sequence of events leads to the perception of a visual scene? I.In response to light, retinal dissociates from rod and cone photopigments, hyperpolarizing the photoreceptor cells and leading to activation of bipolar neurons.II.Action potentials are propagated through ganglion cells, whose axons project to the occipital lobe of the brain.III.In response to light, rod and cone photoreceptors depolarize, causing increased release of neurotransmitter and activation of bipolar neurons.
A. I then II then III B. III then I then II C. III then II D. I then III E. I then II