The gene that codes for the repressor protein of the E. coli lactose operon is:
a. located between the operator and the promoter.
b. downstream from the promoter region.
c. downstream from the operator.
d. constitutive.
e. turned off most of the time.
D
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Two bird species have different mating calls, occupy different habitats in nature, and when they hybridize, the hybrids are infertile. Which isolating mechanisms maintain these species?
A. ecological isolation, behavioral isolation, and hybrid sterility B. mechanical isolation, hybrid sterility, geographical isolation C. ecological isolation, mechanical isolation, hybrid sterility D. geographical isolation, temporal isolation, behavioral isolation Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about reproductive isolation? 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?
The DNA-protein complex in eukaryotic chromosomes is called the genome
Indicate whether the statement is true or false
Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic. B. cows can manufacture all 20 amino acids out of sugars in the liver. C. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose. D. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
________ is the total of all chemical reactions occurring in the cell.
Fill in the blank(s) with the appropriate word(s).