The lesions in the brains of people with Alzheimer disease are caused by a protein fragment called
___________________. Fill in the blank(s) with the appropriate word(s).
ANS: amyloid beta-protein
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In science the word "theory"
a. signifies that a hypothesis has been tested and proven over a period of time. b. means that a scientist has a hunch something is true. c. has essentially the same meaning as "hypothesis." d. carries a considerable amount of doubt as to its validity. e. is an explanation that has been published.
The poly(
A) tail of an mRNA A) helps transport the pre-mRNA to the cytoplasm. B) keeps the coding sequences from being degraded. C) is added without an RNA template. D) is important in initiation of translation. E) is removed from an mRNA after its maturation.
Identify the character change in the following data.
Species A: AUGGGCGTCC Species B: AUGGGCGTCC Species C: AUGGGCGTCC Outgroup: AUGGGCTTCC A. G7T B. GT7 C. T7G D. TG7
During anaphase of mitosis, the
A. nuclear membranes begin to reappear around each of the patches that will soon be daughter nuclei. B. number of distinct chromosomes present is twice the number that was present before mitosis started. C. centromeres have not divided. D. chromosomes replicate by making exact copies of themselves.