Which phase results in the ovum and a polar body?
a. meiosis I
b. meiosis II
c. fertilization
d. mitosis I
e. mitosis II
ANSWER: b
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A researcher notices that in a certain moth species, some females prefer to feed and lay eggs on domesticated solanaceous plants like potatoes and tomatoes. Other females prefer to feed and lay eggs on wild solanaceous plants like Datura. Both male and female moths primarily use scent to find these plants from afar. Females tend to mate where they feed, and the researcher finds a genetic basis for scent preference in these moths. Based on the above information, what might be occurring in this moth species?
A) divergence in sympatry B) divergence due to habitat fragmentation C) postzygotic isolation D) polyploidization
Transfer RNA molecules
A) function to transfer ribonucleotides to RNA polymerase during transcription. B) function to transfer the correct amino acids to the ribosome during translation. C) contain codons that bind to ribosomes during translation. D) are only present in the nucleus or eukaryotes.
Choose the true statements about the role of genome analysis in crop improvement. Check all that apply.
_____ Conservation of synteny will hinder our ability to find agriculturally important genes in plants. _____ Arabidopsis is being genetically modified as a crop plant. _____ Sequencing of the rice genome was important because it is related to many other cereal crop plants. _____ Insertion of genes from beneficial microbes into plant genomes can be used to improve crop yields.
Which of the following types of microbes might be found in a boiling hot spring?
A) hyperthermophiles B) phototrophic bacteria C) methanogens D) non-thermophiles E) halophiles