Centrosomes are associated with
A. mitochondria.
B. chromosomes.
C. lysosomes.
D. microtubules.
E. ribosomes.
Answer: D
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At the start of translation, the initiator tRNA pairs with the start codon at the ____ of the ribosome
a. A (aminoacyl) site b. promoter c. P (peptidyl) site d. ribosomal binding site e. E (exit) site
As a farmer you spray your weed-infested crops with a herbicide containing glyphosate. Glyphosate stops plants from producing aromatic amino acids needed for development. The main reason you are not worried this will affect the growth of your crops is that
A. glyphosate-resistant crops are produced to create higher amounts of enzymes that make aromatic amino acids. B. crops have been sprayed with a soil bacteria that protects the plants from the mechanism of glyphosate. C. crops are genetically engineered to extract higher amounts of aromatic amino acid from the soil bacteria. D. different plants respond differently to glyphosate; some crops have an enzyme that breaks down glyphosate to a harmless substrate.
Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?
A) reptiles B) amphibians C) lobe-finned fish D) sharks
Two hundred years ago, the fly species Rhagoletis pomonella only laid its eggs on fruit of the hawthorn tree. Today, different "host races" of R. pomonella lay their eggs on hawthorns OR apples. Apples occur within the range of hawthorns, so divergence between apple flies and hawthorn flies could be the first step in sympatric speciation. Choose the evidence that would suggest that R. pomonella is currently undergoing sympatric speciation. Check all that apply.A) Apple flies typically mate with apple flies, and hawthorn flies typically mate with hawthorn flies.B) Apple flies and hawthorn flies emerge from their hosts at different times of the year.C) Apple flies and hawthorn flies are able to form fertile hybrids.D) Apple flies and hawthorn flies are physically indistinguishable
from each other. What will be an ideal response?