The accompanying figure illustrates that after two half-lives, ____ percent of the parent radioisotope has decayed

a. 100
b. 75
c. 50


d. 25
e. 0


ANSWER: b

Biology & Microbiology

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In muscle function at the sarcomere level, the formation of cross-bridges is regulated by the binding of ___ ions to ____.

A. calcium, troponin B. calcium, tropomyosin C. calcium, myosin D. sodium, troponin E. sodium, tropomyosin

Biology & Microbiology

Answer the question using the accompanying figure. The antigen-binding site is indicated by number____

a. 1 b. 2 c. 4 d. 5 e. 6

Biology & Microbiology

A mutualistic symbiosis where fungal hyphae grow between and around plant roots but do not

penetrate plant root cells is called a(n) ____.

a. ectomycorrhiza b. lichen c. arbuscule d. endomycorrhiza e. haustorium

Biology & Microbiology

Short tandem repeats on ____ may be used to determine genetic relationships among male relatives and descendants

a. the Y chromosome b. chromosome 3 c. the X chromosome d. chromosome 8 e. chromosome 20

Biology & Microbiology