The characteristic ____________of a radioisotope

allows us to determine the age of rocks and fossils
using a technique called __________ Fill in the blank(s) with the appropriate word(s).


Answer: half-life, radiometric dating

Biology & Microbiology

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Animals colonized land after plants did. The first land animals were _____, who first colonized land about _____ million years ago

A. insects; 575 B. hemichordates; 542 C. chelicerates; 420 D. insects; 360 E. myriapods; 100

Biology & Microbiology

Root hairs develop from the

A) pericycle. B) cortex. C) endodermis. D) Casparian strip. E) epidermis.

Biology & Microbiology

What may be a result of the denaturation of proteins?

A. Formation of hydrogen bonds B. Loss of three-dimensional structure C. Removal of R groups from amino acids D. No change in enzyme activity E. Formation of covalent bonds

Biology & Microbiology

Refer to Table 8.2. What is the sequence of amino acids encoded by the following sequence of bases in a strand of DNA?

A) leucine-arginine-lysine-alanine B) asparagine-arginine-lysine-alanine C) asparagine-cysteine-valine-serine D) Translation would stop at the first codon. E) The answer cannot be determined based on the information provided.

Biology & Microbiology