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Svetllana [295]
3 years ago
8

In a study on the biological bases of learning, lab rat a is given a drug that blocks dopamine activity in its brain. thereafter

, the rat is placed in an operant chamber where a lever-pressing task is shaped through positive reinforcement. we should expect that the rat will have
Biology
1 answer:
Anvisha [2.4K]3 years ago
8 0
We should expect that the rat will have have more difficulty in learning the task compared to a normal rat. This is because the rat has been injected with a certain drug that oppresses the dopamine activity. And then the rat is placed in an operant chamber where a lever-pressing task is shaped through positive reinforcement. 
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Xavier boiled 45 grams of water. If all of the water changed into a gas, what would be the weight of the water vapor?
Troyanec [42]

Answer:

45 g

Explanation:

Conservation of matter.

7 0
3 years ago
There are several different kinds of aquatic ecosystems. Bogs get their water from precipitation, so they don't have many Fill i
Ratling [72]
  1. Bogs get their water from precipitation, so they don't have many <u>nutrients</u>.
  2. Marsh plants are adapted to waterlogged <u>soil</u>
  3. Swamps have <u>plants like trees and shrubs</u>.
  4. Rivers always have flowing currents and pick up <u>sediment</u> as they flow.
  5. Lakes are bodies of water on land.  
  6. Wetlands act as filters for nutrients and pollutants dissolved in the water.
  7. Estuaries are wetland regions where freshwater rivers mix with ocean water.

Explanation:

A wetland is a biome which has both water and land that are intermixed in various ways. According to the type of the wetland, the ecosystem differs.

Bogs: Wetland with water from precipitation and no inflow or outflow of surface or ground water.  

Soil: Acidic, infertile with less nutrient content

Vegetation: Acid-loving plants

Swamps: Forest wetlands near rivers and lakes.

Soil: well draining, mineral soil

Vegetation: Trees and bushes. Swamps are classified according to the vegetation, like coniferous swamp, hardwood swamp, shrub swamp etc

Marsh: Wetlands mostly inundated with water leading to waterlogged soil  

Soil: Organic and mineral soil

Vegetation: Hydrophytic plants adapted to waterlogged soil

Estuaries: Wetland regions enclosed by land one side where fresh water mixes with saline ocean water.  

Soil: Saline alkaline soil

Vegetation: Mangrove trees

Rivers and lakes are water bodies that form a part of wetlands.  

Rivers are flowing water bodies which flows through water current and picks up sediments as it flows.

Lakes are stationary water bodies that are enclosed by land mass on all its sides.

The wetlands act as a natural filter and receive all the sediments, pollutants etc which are dissolved in water and carried by the rivers and other water sources.

4 0
3 years ago
Read 2 more answers
Large bodies of water help to stabilize air temperatures. An ice cube cools water by adding coldness. Evaporative cooling preven
8090 [49]

Answer:

Water is slower to heat than most materials.

Explanation:

There is a physical property called "specific heat". This property determines the amount of temperature necessary to change 1ºC in the temperature of the materials. The higher the specific heat of the material, the slower it will heat up.

The water has an extremely high specific heat, which means that it will slowly heat up to an extremely high temperature. The specific heat of the water is greater than most materials and this explains why high variations and external temperature changes almost do not cause changes in the water of the picisnas, for example.

6 0
3 years ago
This type of circulatory system has cells in constant contact with circulatory fluid (no vessels). Some smaller organisms have t
Temka [501]
She's right C I just took da test
3 0
3 years ago
Suppose an assassin uses abrin, a translation inhibitor, to poison her victim. Place the events in chronological order, starting
mihalych1998 [28]

Answer:

The events in chronological order are:

  1. Abrin is absorbed into the blood and enters the body's cells
  2. Abrin binds to ribosomes in the cytoplasm
  3. Abrin inactivates the 28S rRNA in the large subunit of the ribosome.
  4. Ribosomes are unable to add new amino acids to polypeptides
  5. Protein synthesis halts in many tissues
  6. Multiple organ systems fail
  7. Victim dies

Explanation:

Abrin is a toxic protein obtained from the seeds of Abrus precatorius, it is highly toxic, with an estimated human fatal dose of 0.1-1 microgram/kg, and causes death after accidental and intentional poisoning.

When ingested the abrin would enter the victim's body and travel through the blood and eventually enter a cell's cytoplasm (abrin is absorbed into the blood and enters the body's cells). Once there it would interact with the ribosomes and reacts with them on a molecular level (peptide bond catalytic enzyme) (abrin binds to ribosomes in the cytoplasm), which results in the ribosome exhibiting its toxic response to abrin (abrin inactivates the 28S rRNA in the large subunit of the ribosome). As a result of the ribosome reacting to abrin (ribosomes are unable to add new amino acids to polypeptides), protein synthesis within that cell is affected (protein synthesis halts in many tissues). Once multiple cells are affected by abrin the organ will exhibit its toxic response (multiple organ systems fail), and the victim would die.

8 0
3 years ago
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