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Maurinko [17]
3 years ago
6

Nitrogen can be changed by lightning into a form so _______________ can use it.

Biology
2 answers:
balu736 [363]3 years ago
8 0
Living organisms can use it.
iren2701 [21]3 years ago
4 0
<span>The nitrogen cycle is the process by which nitrogen is converted from organic to inorganic forms; many steps are performed by microbes</span>
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Which of the following results from cutting down trees
ZanzabumX [31]

Answer:

D

Explanation:

Vegetation on soil protects the soil from erosion because its roots and root hairs help bind the soil particles together. This occurs mechanically by binding soil into crumbs and also chemically by providing organic matter that binds the soil particle into humus that holds moisture. The soil becomes heavy to be carried off by wind erosion. Trees also break the down flow of water hence reducing the capacity of runoff to carry soil sediments.

4 0
3 years ago
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Which statement best explains how the genetic code is universal? * The shape of a DNA molecule is the same in different species.
AysviL [449]

Answer:

A DNA sequence codes for the same proteins in different species

Explanation:

All living organisms store their genetic information in DNA (genetic material). The manner through which information in the genes are encoded is the GENETIC CODE. The genetic code comprises of all the codons that specifies amino acids in living organisms. The genetic code has several characteristics, which includes that the GENETIC CODE IS UNIVERSAL

The genetic code is said to be universal because all known living organisms use the same genetic code to encode their genetic information. This means that a DNA sequence codes for the same proteins in several different species. For example, codon AUG encodes the amino acid METHIONINE in every living organism.

7 0
3 years ago
Which of the statements regarding the cell cycle is true? Group of answer choices It is regulated by cyclins and CDKs. Different
MA_775_DIABLO [31]

Answer:

All of these choices are correct.

Explanation:

Cell cycle is the process of growth and division of cell. It comprises of interphase and mitosis. In interphase the cell grows, replicates its genomic content and prepares itself for division. In mitosis the division occurs.

Cell cycle is controlled by a group of kinases called as Cyclin dependent Kinases (CDKs). They act by phosphorylating their substrates. They are of various types like Cdk1, Cdk2, Cdk4 etc. They become active when they bind to a regulatory protein called cyclin. They are also of various types like Cyclin A, Cyclin B, Cyclin C etc. Level of cyclin and corresponding CDK increases and decreases according to the stage of cell cycle. For example in S phase of cell cycle concentration of cyclin A and E shoots up. CDK2 is able to bind to these cyclin molecules and hence it becomes active.

Cell cycle has major checkpoints where the condition of cell is analysed before it proceeds to the next stage of cycle. If any abnormality is detected, repair mechanism is activated or the cell is killed. Checkpoints do not allow cell cycle to proceed in damaged cells.

p53 is a tumor suppressor protein which can halt cell cycle when it detects some abnormality in cell. It usually acts in G1/S checkpoint (before the DNA replication starts in cell) and G2/M checkpoint (before the cell division begins). Hence, all of the above statements are true.

7 0
3 years ago
The physical properties that determinantes how easily beat and and electricity pass through a material is
Nastasia [14]

Answer:

D

Explanation:

7 0
3 years ago
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user100 [1]

Answer:

phenotype is Rr, or rr genotype is RR, or Rr.

Explanation:

because we combine two types of letters so we may find out what compartment of the Punnet square represents.

7 0
2 years ago
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