BIOLOGY HIGH SCHOOL

In a chemical change, the substance that changes is called the product. true or false

Answers

Answer 1
Answer: I believe that is wrong.

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A dog called the Maltese doesn't shed. This type of dog most likely came about through _____. hybridization genetic engineering recombinant DNA cloning

Answers

Answer:

The correct answer would be hybridization.

Hybridization refers to the process by which organisms of different breed, species, or varieties are selectively interbred in order to produce offspring with desired characters.

Similarly, Maltese dogs were selectively bred in order to attain characters like the small size, less shedding of hairs et cetera.

Answer:

Explanation:

Genetic Engineering

Even if you live in the middle of North America, the quality of your watershed can affect the quality of the ocean. How can this be? Select one: a. Evaporation carries materials from your watershed to the ocean. Incorrect b. Materials in your watershed are eventually transported to an ocean. c. The amount of water in your watershed will affect ocean evaporation. d. Materials in your watershed are not transported to an ocean.

Answers

The appropriate answer is b. Materials in your watershed are eventually trasported to an ocean. A watershed is the land area in which surface runoff enters into a river or river system. All rivers flow from a high elevation (upper course) to a low elevation (lower course). In most cases the lowest point where a river will flow to is the sea. As rivers flow they transport and deposit material along the course and eventually in the sea.

The law of conservation of momentum states that the total momentum of a system _____.-increases
-decreases
-remains constant

Answers

The total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. The answer is: remains constant.

Which provides long-term energy storage?a. Glycogen
b. Glucagon
c. Glucose
d. Cellulose

Answers

Glycogen provides long-term energy storage.

Glycogen is an example of a carbohydrate which is a polysaccharide that acts as a long-term energy storage compound in animals.

Further Explanation

  • Living organisms require energy in order to undertake their daily activities such as growth and development, locomotion, gaseous exchange, etc. To do so they obtain nutrients for short-term and long-term energy source.
  • Carbohydrates are the major energy source for living organisms, however, living organisms may use other sources of energy such as proteins or fats when carbohydrates is out of stock or not available.  

Energy source in animals

  • Animals use simple carbohydrates such as glucose obtained from diet for short-term energy sources.
  • These simple carbohydrates may also be stored for future use in the form of glycogen, which makes glycogen a long-term energy source, to be used when need arises.
  • When glucose levels are low in the body hormones in the body trigger the breakdown of glycogen to glucose.
  • Other sources of energy such as proteins and fats are used when carbohydrates storage is depleted, for example during starvation.

Energy source in plants

  • In plants, on the other hand, simple carbohydrates are similarly used as a short term source of energy. Additionally, simple molecules such as glucose are stored in the form of starch for long-term source of energy for the plants.  

Why other Choices are incorrect:

Glucagon  

  • Glucagon is the hormone that increases the blood glucose level to avoid it from dropping below optimum level.
  • The hormone acts on the liver to stimulate the breakdown of glycogen to glucose, a process called glycogenolysis, and the glucose is released to the blood stream.

Glucose

  • Glucose is a simple carbohydrate classified as monosaccharides. It acts as the short term source of energy in both plants and animals.
  • It is readily broken down during the process of cellular respiration to yield energy in the form of ATP, which is then used to drive cellular processes.

Cellulose

  • Cellulose is an example of a complex carbohydrates known as polysaccharides.
  • It is found in plants cells lining the cell wall of all plant cells which is one of the key distinguishing feature between plant cells and animal cells.

Keywords: Glycogen, Glucose, energy sources  

Learn more about:  

Level: High school

Subject: Biology  

Topic: Cellular respiration

Glycogen serves as a long-term energy storage molecule in animals, including humans. Therefore option A is correct.

It is a complex carbohydrate made up of glucose units linked together in a branched structure. When dietary glucose levels are high, excess glucose is converted into glycogen and stored primarily in the liver and muscles.

This stored glycogen can be broken down into glucose when energy is needed during periods of fasting, exercise, or other metabolic demands.

Glucose, on the other hand, is a simple sugar that serves as an immediate energy source, while glucagon is a hormone involved in regulating blood glucose levels. Cellulose, a structural polysaccharide, is not used for energy storage in animals.

Know more about Glycogen:

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Which of the following are water-conducting cells that are dead at functional maturity?

Answers

The correct answer for the question that is being presented above is this one: "the tracheids and the vessel elements." The tracheids and the vessel elements the following are water-conducting cells that are dead at functional maturity. 

The nitrogen cycle _________. A. indicates the process of uptake of nitrates (NO₃ minus) by plants.
B. marks transformation of ammonium (NH₄ plus) into nitrites (NO₂ minus) by bacteria.
C. marks synthesis of ammonium (NH₄ plus) by decomposers.
D. marks transformation of nitrogen (N₂) from the atmosphere to ammonium (NH₄ plus) by bacteria.
E. marks organisms that take part in transformation of nitrogen from the atmosphere (N₂) into ammonium (NH₄ plus) and are located in the root nodules.

Answers

Answer:

D. marks transformation of nitrogen (N₂) from the atmosphere to ammonium (NH₄ plus) by bacteria.

Explanation:

The nitrogen cycle is a biogeochemical cycle which involves transformation of atmoshperic nitrogen into many chemical forms including nitrite (NO2), nitrates (NO3) and ammonium (NH4).

The process of nitrogen cycle starts with the process of nitrogen fixation. In this process several nitrogen fixation bacteria such as cyno bacteria converts the atmospheric nitrogen into ammonium (NH4) in the soil. The resultant ammonium (NH4) can be directly used by plants or transform into nitrites or nitrates through nitrification process.

Hence, the correct option is D.
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