(FUVEST 2009 1ª FASE) Enzimas digestivas produzidas no estômago e no pâncreas foram isoladas dos respectivos sucos e usadas no preparo de um experimento, conforme mostra o quadro abaixo:
Tubo 1 | Tubo 2 | Tubo 3 | Tubo 4 |
Arroz, clara de ovo, óleo de milho e água | Arroz, clara de ovo, óleo de milho e água | Arroz, clara de ovo, óleo de milho e água | Arroz, clara de ovo, óleo de milho e água |
Extrato enzimático do estômago | Extrato enzimático do estômago | Extrato enzimático do pâncreas | Extrato enzimático do pâncreas |
pH = 2 | pH = 8 | pH = 2 | pH = 8 |
Decorrido certo tempo, o conteúdo dos tubos foi testado para a presença de dissacarídeos, peptídeos, ácidos graxos e glicerol. Esses quatro tipos de nutrientes devem estar
Questões relacionadas
- Língua Portuguesa - Fundamental | 8.9 Adjunto Adverbial
Texto base: Texto para a questão Floripa Floripa era uma tulipa
Era uma tulipa negra:
Alta, magra e negra. Não sei se é verdade, contam
Que ela dormia ao relento,
Na serra habitada de onças. Passam meses, entram meses,
Desapareceu Floripa.
De súbito reaparece
Nos seus largos passos rítmicos. Todos conhecem Floripa.
Floripa só fala com a sombra,
Fala, fala, gesticula,
Entre borboletas e cães. Os vestidos de Floripa
Lembram asas voando.
Negros membros esculpidos
Com planejamentos de onda. Floripa era louca mansa:
Por que será que os meninos
Apedrejavam Floripa? “Floripa”. In: O menino poeta. LISBOA, Henriqueta. São Paulo: Peirópolis, 2008, p. 46.
Enunciado:
Nas três primeiras estrofes, são adjuntos adverbiais de lugar:
- Biologia | 12.7 Biosfera, Biociclos e Biomas
Um somatório de resultados de pesquisas revelou que plantas da caatinga produzem substâncias antioxidantes e fotoprotetoras. A caatinga apresenta um reduzido potencial hídrico no solo, precipitações escassas e irregulares. Sua flora nativa apresenta espécies vegetais com caracteres anatômicos, morfológicos e funcionais, especializados para a sobrevivência nas condições adversas de clima e solo, típicos desta fisionomia. Com base nessas informações e na Teoria Sintética da Evolução, é correto afirmar-se que:
- Língua Inglesa | 2.05 Adjetivos
(PUC-RIO) Driverless automobiles - The car that parks itself
CARS that need no driver are just around the corner according to researchers who have been testing vehicles bristling with aerials and cameras on public roads in America. However, researchers do not make cars, so it will be up to firms that do to bring the technology to market. And carmakers are a conservative bunch. Still, slowly and steadily the autonomous car will arrive, with the help of an increasing number of automated driving aids. A Swedish carmaker has recently demonstrated one such feature: a car that really does park itself.
Some cars already have systems that assist with parking, but these are not completely autonomous. They can identify an empty parallel-parking space and steer into it while the driver uses the brake. The Swedish system, however, lets the driver get out and use a smartphone application to instruct the vehicle to park. The car then 1trundles off, manoeuvres into a parking place and sends a message to the driver to inform him where it is. The driver can collect the car in person or use his phone to call it back to where he dropped it off. Autonomous parking could thus be provided at places like shopping centers and airports, which are controlled areas in which automated vehicles can be managed more easily than on open highways. In the past, designs for doing this have relied on car parks being fitted with buried guide wires that a vehicle can follow to an empty bay. That, though, creates 2a chicken-and-egg problem: car-park operators will not invest in such infrastructure until there is a sufficient number of suitably equipped cars on the road. Drivers, conversely, will not want to buy self-parking cars if there is nowhere to use them.
This means, as a safety engineer working on the project observes, that for autonomous parking to work most of the technology will have to be in the car itself. The test car, which looks like a normal car, therefore uses on-board GPS mapping, cameras with image-recognition software, and radar sensors to find its own way around a car park and avoid pedestrians and non-autonomous vehicles. The same engineer says the system is five to ten years from commercial deployment. If it proves a success then infrastructure might adapt to it, for instance by packing cars into tighter spaces. If there is no one in them there is no need to make room for their doors to open.
Driverless cars would also need to communicate with one another, to enhance safety. That, too, is coming. 3A number of carmakers are developing wireless networking systems through which vehicles can exchange data, such as their speed, their steering angle and even their weight, to forewarn anti-collision systems and safety devices if an accident looks likely.
In the USA, for example, a carmaker recently tested a brake light that can provide an early warning to other motorists. If the brakes are applied hard in an emergency, a signal is broadcast. This illuminates a warning light in the dashboard of suitably equipped following vehicles, even if they are out of sight around a bend or not immediately behind the vehicle doing the braking.
The American company has been testing this system as part of a collaborative research project with several European carmakers. 4They have put a fleet of 150 experimental vehicles on the roads. When they tested a group of these, the Americans found the technology let drivers brake much earlier, helping avoid collisions. A driverless car would be able to react even faster.
Another member of the research group has been testing driverless cars on roads around Munich— including belting down some of Germany’s high-speed autobahns. 5The ordinary-looking models use a variety of self-contained guidance systems. These include cameras mounted on the upper windscreen, which can identify road markings, signs and various obstacles likely to be encountered on roads.
The German cars also use a radar, to gauge how far the vehicle is from other cars and potential obstacles, and a lidar, which works like a radar but at optical frequencies. The lidar employs laser beams to scan the road ahead and builds up from the reflections a three-dimensional image of what this looks like. The image is processed by a computer in the vehicle, which also collects and compares data from a high-accuracy GPS unit. A series of ultrasonic sonars similar to those used in vehicles to provide parking assistance are placed around the car to add to the virtual picture. And just to make sure, a set of accelerometers provide an inertial navigation system that double-checks the vehicle’s position on the road.
6Although these cars can be switched to an autonomous driving mode, they are still required to have someone in the driving seat who can take over in the event of any difficulty. Some cars can steer themselves, slow down, brake and accelerate, even changing lanes to overtake slower vehicles.From the print edition: Science and Technology Jun 29th 2013
The author uses the phrasal verb “trundles off” (ref. 1) that could be replaced by:
- Química | 2.1 Soluções e Coloides
(FUVEST 2005 1ª FASE) Em um experimento, para determinar o número x de grupos carboxílicos na molécula de um ácido carboxílico, volumes de soluções aquosas desse ácido e de hidróxido de sódio, de mesma concentração, em mol L–1, à mesma temperatura, foram misturados de tal forma que o volume final fosse sempre 60 mL. Em cada caso, houve liberação de calor. No gráfico abaixo, estão as variações de temperatura (ΔT) em função dos volumes de ácido e base empregados:
Partindo desses dados, pode-se concluir que o valor de x é
- Matemática | 14.2 Prisma
(IFSP) A figura abaixo representa a planificação de um poliedro P:
Avalie as afirmações I, II e III sobre o poliedro representado pela planificação:
I. O número de arestas do poliedro P corresponde a uma vez e meia o número de vértices.
II. O poliedro P tem, pelo menos, duas faces paralelas.
III. O poliedro P pode ser classificado como pentágono.
Contém uma afirmação verdadeira: