Which is an accurate description of organelle genomes? (Select all that apply.)
A) Translation in mitochondria and chloroplasts is often inhibited by bacterial antibiotics (e.g., chloramphenicol).
B) Like bacteria, mitochondria use N-formyl methionine and tRNAfmet in translation.
C) mtDNA and cpDNA are usually organized into nucleosomes by histones.
D) Like bacterial genes, mitochondrial and chloroplast genes do not have introns.
E) Like bacterial genomes, mitochondrial and chloroplast genomes in all species consist of one circular DNA molecule.
A) Translation in mitochondria and chloroplasts is often inhibited by bacterial antibiotics (e.g., chloramphenicol).
B) Like bacteria, mitochondria use N-formyl methionine and tRNAfmet in translation.
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In some flowers, a purple pigment is synthesized from a red precursor pigment. In the absence of all pigment, flowers are white. A pure-breeding plant with red flowers was crossed to a pure-breeding plant with white flowers. All of the F1 plants had white flowers. The F1 plants were crossed to each other, and the F2 consisted of 165 plants: 123 with white flowers, 32 with purple flowers, and 11 with red flowers. How do these results suggest that flower color is determined?
A) One gene with two alleles exists and heterozygotes have a different phenotype than either homozygote. B) The dominant allele of one gene masks the effect of a second gene. C) The recessive allele of one gene masks the effect of a second gene. D) A dominant allele of two genes is necessary for purple flowers. E) A dominant allele of either of two genes is sufficient for purple flowers.
Knockout mice with no active copies of the Dvl-1 gene ____
a. were apparently abnormal physically b. displayed normal social behavior c. were not easily startled d. were apparently normal physically and but not socially e. were apparently normal physically, but displayed abnormal social behavior and were easily startled
In a healthy kidney, glucose and amino acids are reabsorbed into the blood at which location in the nephron?
A) Ureter B) Proximal tubule C) Distal tubule D) Glomerulus E) Nephron loop
Two weeks after a backpacking trip in Tennessee, a hiker experienced flu-like symptoms and noticed a red rash on his thigh. What is the cause of his illness?
A) Treponema pallidum pertenue B) Borrelia burgdorferi C) Borrelia recurrentis D) Leptospira interrogans