When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Which of the following most directly contributes to this phenomenon?

A. no ATP to move cross-bridges
B. no ATP to break cross-bridges between thick and thin filaments
C. no calcium to bind to troponin
D. no oxygen supplied to muscle
E. no energy for the synthesis of actin and myosin


B. no ATP to break cross-bridges between thick and thin filaments

Biology & Microbiology

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Structures that have similar structure and function but different evolutionary origins are called:

A. inherited. B. evolutionary modifications. C. analogous. D. homologous. E. uniform.

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The connection between stem cells and cancer is that

A) all stem cells are also cancer cells. B) cells may become cancerous by expressing "stemness" genes. C) stem cells rescue cells that have become cancerous. D) both stem cells and cancer cells have inactivated telomerase.

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The subunit of a kidney that purifies blood and restores solute and water balance is called a

a. renal pelvis. b. renal capsule. c. nephron. d. ureter. e. urethra.

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The technique of transferring proteins from SDS-PAGE gels onto a membrane and using labeled antibodies to identify particular proteins is known as ________

Fill in the blank with correct word.

Biology & Microbiology