Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America. What outcomes could possibly occur where the ranges of two species overlap?
I) The species will interbreed, eventually fusing over time.
II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is.
III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms.
A) I
B) II
C) III
D) I, II, and III
Answer: D
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The enzyme beta-galactosidase acts on lactose to form galactose. In turn, the presence of galactose leads to expression of the enzymes responsible for the metabolism of galactose. In this case, lactose is serving as a carbon source and as a(n)
A. inducer. B. repressor. C. DNA-binding protein. D. operon. 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 prokaryotic transcriptional regulation? 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?
Five sample bags of rice seed arrive at a lab that includes both GMO blight-resistant rice and
rice that does not have the disease-resistant gene. Assuming the scientist has a known sample of the blight-resistant rice, how might she determine bags contain additional samples of this rice strain?
a. by using a DNA profile b. by developing a genetic marker c. by inserting the gene into a plasmid d. by extracting stem cells
During metaphase I of meiosis, genetic information is exchanged between two homologous chromosomes, resulting in new combinations of alleles. This process is called ________.
A. shuffling B. spermatogenesis C. homology D. crossing-over E. oogenesis
The Ames test demonstrates that a chemical is
A) carcinogenic. B) carcinogenic in Salmonella. C) mutagenic in Salmonella. D) carcinogenic in humans. E) mutagenic in humans.