While working with a randomly mutated cell line, you isolate a bacterium with DNA mid-replication, all tied up in knots. Which enzyme could you hypothesize had mutations and was not functioning?
a. DNA polymerase I
b. DNA ligase
c. topoisomerase
d. primase
c. topoisomerase
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When a forest fire destroys a habitat, but secondary succession allows the forest to be rebuilt, the new forest will continue to be modified over the years until equilibrium is reached and what has formed?
a. population b. primary community c. climax community d. ecosystem
Ricin is toxic because
a. it binds to eukaryotic DNA. b. it binds to eukaryotic mRNA. c. it blocks food from entering the cell. d. it inactivates ribosomes. e. it binds to nerve tissue and causes paralysis
What is the function of a TERRA (telomere repeat-containing RNA)?
What will be an ideal response?
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago