The predictable rate of ____________________ allows scientists to estimate the age of a rock or fossil by examining its isotope content.

Fill in the blank(s) with the appropriate word(s).


radioactive decay

Biology & Microbiology

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The two most important regulatory systems for the maintenance of homeostasis are

a. circulatory and nervous systems. b. endocrine and circulatory systems. c. lymphatic and circulatory systems. d. nervous and endocrine systems. e. lymphatic and circulatory systems.

Biology & Microbiology

In E. coli, the cya gene encodes adenylate cyclase. Will cells that are cya? be able to grow on medium that contains lactose as the sole carbon source? Why or why not?

What will be an ideal response?

Biology & Microbiology

During which stage of meiosis does homologue separation occur?

A. prophase I B. anaphase I C. telophase I D. prophase II E. anaphase II

Biology & Microbiology

What is the main role of human chorionic gonadotropin?

A. It is similar to FSH in stimulating follicle development. B. It stimulates the release of oxytocin from the mother's pituitary. C. It maintains the corpus luteum. D. It allows the mother to realize she is pregnant, via pregnancy tests.

Biology & Microbiology