Absolute dating uses _____ to estimate how old a fossil is.

A. depth within rock layers
B. radioactive isotopes
C. a molecular clock
D. structural features
E. embryonic structuresf


Answer: B. radioactive isotopes

Biology & Microbiology

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One hallmark of speciation is ____

a. lack of change in reproductive behaviors b. a decrease in balanced polymorphisms c. an increase in fixed alleles d. decreased genetic diversity of populations

Biology & Microbiology

Taste buds contain clusters of _____ and supporting cells inside special epithelial papillae

1.chemoreceptors 2.mechanoreceptors 3.photoreceptors 4.thermoreceptors

Biology & Microbiology

Which of the following hominin species was the first to leave Africa, it's fossils date from 1.9 to 0.2 mya, and it had a similar anatomy to our species?

A. Home floresiensis B. Home erectus C. Sahelanthropus tchadensis D. Australopithecus afarensis

Biology & Microbiology

For the hipAB TA module in Escherichia coli,

a. HipB is the toxin. b. HipA is the antitoxin. c. Lon degrades HipB, allowing HipA to inhibit translation and leading to persistence. d. HipA degrades Lon, allowing HipB to inhibit translation and leading to persistence.

Biology & Microbiology