Which of the following does not occur in prokaryotic gene expression, but does occur in eukaryotic gene expression?
A) mRNA, tRNA, and rRNA are transcribed.
B) RNA polymerase binds to the promoter.
C) A cap is added to the end of the mRNA.
D) RNA polymerase requires a primer to elongate the molecule.
C
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Which of the following is the best answer for why plants require nitrogen?
A. To make chlorophyll B. To make amino acids and nucleotides C. To make cell walls D. To make membranes
Karyotyping involves taking pictures of chromosomes during
a. prophase. b. telophase. c. metaphase. d. interphase. e. anaphase.
A geneticist is studying a particular Drosophila mutant that produces a phenotype of "no wing" due to a mutation in a gene called wingless. She takes the mutant wingless and mutagenizes it. She hypothesizes that any fly that emerges with wings will be
due to the original mutated gene reverting back to the wild-type allele. From this study, she identifies a fly that now has wings. When she sequences the wingless gene, she discovers that the original mutation is still there, and there are no other mutations in the wingless gene. However, a second gene at a separate locus is mutated. The second mutation is best classified as a(n) ________. A) conditional mutation B) intergenic suppressor mutation C) haploinsufficiency mutation D) intragenic suppressor mutation E) null mutation
Actinomyces israelii
A. can be transmitted by respiratory droplets. B. can cause pneumonia with symptoms similar to tuberculosis. C. are filamentous rods that grow in clusters called sulfur granules in infected tissue. D. lives in the soil. E. causes most cases in the immunocompromised.