The _________ are the organizing centers for microtubules involved in separating chromosomes during mitosis.
Fill in the blank(s) with the appropriate word(s).
Answer: centrosome(s)
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Avery, MacLeod, and McCarty's experiments revealed that the transforming principle had all of the following properties except
A. its activity was destroyed by treatment with proteases. B. its activity was unaffected by RNA-digesting enzymes. C. its activity was unaffected by lipid extraction. D. its activity was destroyed by treatment with DNA endonucleases.
Dandelions, Taraxacum officinale, are plants that asexually produce fruitlike propagules. Sexual reproduction is very rare in this organism. Which species concept would be least useful in defining dandelions as a species?
A. Phylogenetic species concept. B. Biological species concept. C. Evolutionary species concept. D. Ecological species concept. E. Both the evolutionary and ecological species concepts.
Use a Punnett square to determine how many different genotypes can be produced by two
parents that are homozygous dominant (mother) and homozygous recessive (father) for a particular trait.
a. four b. two c. three d. one
Particularly with regard to gas exchange, why do we have respiratory and cardiovascular systems, but flatworms, which are only a few cells thick, don't?
What will be an ideal response?