BIOLOGY HIGH SCHOOL

Why does a flowing-water ecosystem often support little plant life at its source? Describe how the ecosystem changes to support organisms as it flows.

Answers

Answer 1
Answer: There is little plant life near the source of a river or stream because due to the rapid flowing of water throughout rivers and streams plant life cannot put their roots deep into the soil because they will be uprooted by the fast flowing water
Answer 2
Answer:

Final answer:

A flowing-water ecosystem supports little plant life at its source due to factors like minimal silt accumulation and shading. As the ecosystem flows downstream, organic material and nutrients support a food chain and adaptations enable survival and growth of organisms like leeches and trout.

Explanation:

The flowing-water ecosystem often supports little plant life at its source due to several factors. The fast-moving water results in minimal silt accumulation, making the water clear and inhibiting the growth of phytoplankton. The presence of tree cover and shading also keeps temperatures lower, further reducing photosynthesis.

As the ecosystem flows downstream, changes occur that support more organisms. Organic material and nutrients from leaves and other plants that fall into the water provide an additional source of energy. When the leaves decompose, the nutrients are returned to the water, supporting a food chain of invertebrates, which are then preyed upon by fish and other predators. Adaptations are also seen in organisms, such as leeches and freshwater trout, to survive and thrive in the fast-moving and colder waters.

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Compare and contrast RNA and DNA. (How are they different? How are they similar?)
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What do unicellular organisms eat?

Answers

It depends in the unicellular organism some produce their own food (photosynthesis)while others consume other organisms for survival yet scientist still know that they do eat I hope this helps. :)
It depends plays make there own food

Which element is found in nucleic acids but not in proteins?

Answers

Phosphorus is the element found in nucleic acids but not in proteins.

Further Explanation

Proteins  

  • Proteins are one of the major biomolecules that exists in nature.
  • They are made of amino acids which are the building blocks. Amino acids contain four different elements which include;
  1. Hydrogen  
  2. Oxygen  
  3. Nitrogen
  4. Carbon
  5. Some amino acid contains sulfur element.

Nucleic acids

  • Nucleic acids are one of the four major bio-molecules in nature. Nuclei acids is divided into two; RNA and DNA.
  • The building blocks of nucleic acids are Nucleotide bases which are made by a nitrogenous base, a sugar and a phosphate group.

DNA  

  • DNA is a nuclei acid that is responsible for carrying genetic information in living organisms.
  • It is through DNA that genetic information is passed from one organism to another through the process of DNA replication.
  • Additionally, it carries the information that is used to make proteins which performs various functions in living cells.
  • Each Nucleotide in DNA contains a nitrogenous base, a deoxyribose sugar, and a phosphate group.
  • DNA molecules are made up of nitrogenous bases; Adenine, Guanine, Cytosine and Thymine.

RNA

  • Ribonucleic acid (RNA) is a type of nucleic acid, a molecule that plays a major role in the flow of information from the DNA to the proteins. For a gene to be expressed information has to be passed through the RNA.
  • Each nucleotide in RNA contains a nitrogenous base, a ribose sugar, and a phosphate group.
  • Nitrogenous bases in RNA includes; Adenine, Guanine, Cytosine and uracil. Thymine in DNA is replaced with Uracil.

Keywords: DNA, RNA, Nitrogenous bases  

Learn more about:  

Level: High school

Subject; Biology

Topic; Nucleic acids

Sub-topic: RNA and DNA structure

The element is found in nucleic acids but not in proteins are the Phosphorous.

Nucleic acids are polynucleotides, which are long chainlike polymers made up of essentially identical nucleotide building components. Each nucleotide is made up of a nitrogen-containing aromatic base that is linked to a pentose (five-carbon) sugar, which is then linked to a phosphate group.

Proteins are composed of hundreds or thousands of smaller units known as amino acids that are linked together in lengthy chains. A protein is made up of 20 different types of amino acids that can be mixed. The sequence of amino acids determines each protein's distinct three-dimensional structure and function.

Thus, Phosphorous is the element which is found in nucleic acid but not in proteins.

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What is a binomial nomenclature?a.a two word system for naming organisms by using the genus and species
b.a two word system for naming organisms by using the family and genus
c.a two word system for naming organisms by using the order and family
d.a two word system for naming organisms by using the domain and species

Answers

Answer:

The correct answer would be a. a two-word system for naming organisms by using the genus and species.

Binomial nomenclature or two name naming system refers to the formal system of naming a living organism.

This system gives a two words name to specific species. Both the words are generally Latin in origin.  

The first word always starts with a capital letter and represent the genus name of an organism.

The second name starts with the small letter and represents the species name of the organism.

The scientific name is always written in italics when typed or printed or underlined separately if it is handwritten.

For example, the scientific name of human is Homo sapiens. The Homo represents the genus whereas sapiens represents the species.
A because is a system of naming organisim.the first is the genus followed by specific epithet

Multicellular organisms have many cells. What is the one other characteristic they must have before they can be called multicellular

Answers

The cells must be specialized.

For a single cell or commonly known as unicellular, for them to become a multicellular cell, one must undergo specialization. Multicellular organisms consist more than one cell. It is the opposite of unicellular organisms. Examples of multicellular organisms are animals and plants.

The Answer is: The Cell Must Be Specialized

Which of the following is a constitutional power of the Senate?A. initiating revenue bills

B. impeaching federal officials

C. confirming presidential appointments

D. The Senate does not have any of these powers.

Answers

"Confirming presidential appointments" is the one among the following choices given in the question that is a constitutional power of the Senate. The correct option among all the options that are given in the question is the third option or option "C". I hope the answer has come to your desired help.

Answer:

C. confirming presidential appointments

Explanation:

Scientists can use genetic information to identify people because it is unique to each person. Which specific characteristic is unique to an individual?

Answers

The DNA of any individual possesses genetic traits which vary from individual to individual. Traits can be physical traits or behavioral traits. Example of a physical trait would be the appearance of an individual and behavioral trait refers to the nature of the individual. Both vary from individual to individual.
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