Which statement about the geologic time scale is false?
a. Mammals originated early in the Mesozoic era.
b. Radiations of marine invertebrates took place in the Mesozoic era.
c. Mass extinction of the dinosaurs occurred about 65 million years ago.
d. Reptiles originated during the Paleozoic era.
e. Eukaryotes originated during the Proterozoic eon.
ANSWER: b
You might also like to view...
As a microbiologist you have been asked to investigate the regulation of a novel gene in a bacterial species. Given what is known about bacteria, the logical place to begin your investigation is
A. transcriptional regulation. B. translational regulation. C. alternative splicing regulation. D. regulation by enhancer elements. E. regulation by general transcription factors. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about gene regulation in bacteria? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Cancer is usually due to:
A. exposure to chemicals or radiation. B. mutations in stem cells. C. a series of mutations that occur throughout an affected tissue or organ. D. a series of mutations that occur in a single lineage of somatic cells. E. a series of mutations that occur in multiple lineages of germ cells.
The growth of a new plant on the margin of a leaf that eventually falls to the ground and grows independently is an
example of ____.
a. fragmentation b. protoplast fusion c. somaclonal selection d. grafting e. apomixes
During resting exhalation in humans, the diaphragm ____ and the internal intercostal muscles ____
a. contracts; relax b. relaxes; contract c. contracts; contract d. relaxes then contracts; contract then relax e. relaxes; relax