When a person dies, the body often experiences rigor mortis. In this condition, it is as if the muscles have become

inflexible and it is very difficult to manipulate the joints. Why does this occur? What will be an ideal response?


ANSWER: In considering the molecular mechanism of muscular contraction, you will note that for the
myosin heads to release the actin (thus breaking the cross-bridge) it is necessary for ATP to

Biology & Microbiology

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A 39-year-old woman is in her sixth week of pregnancy. Due to her advanced age, she is at higher risk for having a baby with Down's syndrome than younger pregnant women. She would like to find out as early as possible whether or not her baby has Down's syndrome. Her doctor should suggest  

A.  amniocentesis. B.  genetic counseling. C.  chorionic villi sampling. D.  a pedigree analysis.

Biology & Microbiology

How do lampreys differ from other vertebrates?

What will be an ideal response?

Biology & Microbiology

The enzyme adenosine deaminase acting on RNA (ADAR) catalyzes which of the following nucleotide conversions?

A. adenosine to inosine B. adenosine to cytidine C. adenosine to guanosine D. thymidine to uridine

Biology & Microbiology

Declining amphibian populations are correlated with four of the following. Which one is the exception?

a. habitat loss b. introduction of new species c. long-term changes in climate d. evolutionary changes in amphibians e. fungal infections and parasitic diseases

Biology & Microbiology