C14 is a radioactive isotope, and due to its predictable

__________ rate it is used to date organic fossils. Fill in the blank(s) with the appropriate word(s).


Answer: decay

Biology & Microbiology

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If two otherwise dissimilar organisms share similar genomic DNA, it suggests which of the following conclusions?

A. The shared genes are ancient and probably no longer function within the altered physiological states of modern organisms. B. The shared genes have evolved a number of times and have no phylogenetic significance. C. The two taxa are more closely related than formerly believed. D. The shared genes developed early in evolution and are likely to be applicable to a wide diversity of organisms. E. DNA is not a reliable basis for phylogenetic decisions.

Biology & Microbiology

As a result of nondisjunction, an individual with Turner syndrome is genotypically XO, lacking one of the sex-determining chromosomes. Taking this into account, the fusion of the gamete containing the extra chromosome with a normal gamete could result in an individual with the genotype

A) XXX. B) XXY. C) XYY. D) A or B E) A, B, or C

Biology & Microbiology

What do BRCA1 and p53 have in common?

A. Both cause eye cancers. B. Both cause breast cancer. C. Both are tumor suppressors. D. Both are inherited as autosomal dominant traits. E. Both are oncogenes.

Biology & Microbiology

The largest cones produced on a pine tree, the ones we are typically most familiar with, are the female

cones that contain:a. megasporangia. b. microsporangia. c. pollen. d. microspores. e. antheridia

Biology & Microbiology