In what way are elements in the same column of the periodic table the same? They have the same number of _____
A) protons
B) electrons when neutral
C) electrons in their valence shells when neutral
D) electron shells when neutral
C
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Rosalind Franklin's research contribution was essential in _____
a. establishing the single-stranded nature of DNA b. establishing the principle of base pairing c. establishing most of the principal structural features of DNA d. sequencing DNA molecules e. determining the bonding energy of DNA molecules
How are mammographies disadvantageous?
A. They have a low success rate and are incapable of detecting small tumors. B. They involve exposure to radiation, which increases the risk of cancer. C. They cannot detect cysts and fibroadenoma. D. They can detect cancer only in its advanced stages
What are the basic functional units of the nervous system?
A) muscle fibers B) heart cells C) neurons D) fibroblasts
Motor proteins require which of the following to function in the movement of chromosomes toward the poles of the mitotic spindle?
A) intact centromeres B) a microtubule-organizing center C) ATP as an energy source D) synthesis of cohesin