Regarding the lactose utilization system in E. coli, a constitutive mutant is one in which the three enzymes are produced regardless of the presence or absence of lactose
Indicate whether the statement is true or false
TRUE
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You are an engineer at a power plant that creates large volumes of hot waste water, which disrupts the ecosystem of the river it drains into. Another part of the plant requires warm oil, and the plant uses large amounts of energy to heat it. Inspired by countercurrent exchange in whales, you save energy and benefit the environment by
A. running the oil pipes under the river after dumping in the hot waste water B. running the oil pipes around the waste water pipes, to allow heat transfer from water to oil C. running the waste water and oil through a single pipe D. adding a sensor, integrating center and effectors to control temperature in both pipes 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 countercurrent exchange? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Which of the below is not one of the Four types of descriptive studies in epidemiology:
a. ecologic studies b. case reports c. case series d. divisional surveys
In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.
It is generally thought that animals have undergone four major physiological and anatomical innovations during their evolution. These are (in no particular order)
a. multicellularity, bilateral symmetry, origin of patterns of embryonic development, development of tissues. b. development of the versatile forelimb, multicellularity, origin of patterns of embryonic development, development of tissues. c. development of tissues, photosynthesis, bilateral symmetry, multicellularity. d. bilateral symmetry, development of tissues, origin of the multichambered heart, origin of patterns of embryonic development. e. origin of patterns of embryonic development, development of the versatile forelimb, origin of the multichambered heart, multicellularity.