1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Greeley [361]
2 years ago
15

What results from the addition or deletion of nucleotides in any number except a multiple of 3?

Biology
1 answer:
eimsori [14]2 years ago
8 0
Addition or deletion of nucleotides in any number besides 3 results in a "frame-shift mutation."
This is because every 3 nucleotides of DNA/mRNA exons codes for a single amino acid in the synthesis of a protein. This triplet codon theory means that if 3 nucleotides are added or deleted then an amino acid will be added or lost, but subsequent codons and amino acids will still be read correctly.
However, if any number of nucleotides other than 3 are added or removed, then the codons following the mutation will be out of "sync," in terms of the reading order.
Hence it is called a frame-shift mutation because it shift the reading frame when translating nucleic acids into proteins. Frame shifts will lead to the wrong amino acids being adding in the wrong order for the rest of the code after the mutation.
You might be interested in
NEED HELP.
gayaneshka [121]

Answer:

Clear cuts are areas from which every tree has been cut down and removed, in a shelterwood system the old stand is removed in a series of cuttings to promote the establishment of an essentially even-aged new stand under the shelter of the old one, and uncut forests are just your average wild woods, left alone and was never bothered with.

for a simpler answer: clear cuts are clear areas, shelter wood are slight cuts, removing some trees for an environment such as parks and backyards, and uncut forests are wild forests that has no trees cut down.

7 0
2 years ago
Read 2 more answers
What evidence is there that the endangered species act is causing harm to species????
Juliette [100K]

Answer:

There is strong and increasing evidence the Endangered Species Act is causing widespread harm to the species it is supposed to protect-to the extent the Act may be doing more harm than good. The Act makes otherwise normal and legal forms of land and resource use illegal, such as farming, home building and cutting timber. The Endangered Species Act’s severe penalties-$100,000 and/or 1 year in jail for harming a single species or even unoccupied habitat that is deemed suitable-turn species in to liabilities. As a result, landowners seek to reduce their liabilities in a number of ways.

Explanation:

3 0
3 years ago
Some of the nerve endings in the skin are sensitive to changes in temperature. They are part of a negative feedback mechanism re
Gemiola [76]

Answer:

Answer is option A (receptor).

These nerve endings represent a receptor in the negative feedback mechanism.

Explanation:

Homeostasis in the human body is the tendency of the body to maintain its internal environment suitable for normal and optimal functioning by adjusting the changes occurring in internal variables such as body temperature, blood pressure, etc using feedback mechanisms. The two feedback mechanisms involved in homeostasis are positive feedback (the output of the system stimulates the system to increase the output further) and negative feedback mechanisms (the output of the system stimulates the system to decrease the output).

The various components in the feedback loop include;

stimulus - an initiation event that causes changes in a variable.

variable - a physiological factor that is kept at a normal range.

receptors - monitor the variable, detect changes in the variable value and report to control center.

control center - it compares the variable value to the normal range and if any deviation is found, the effectors are activated.

effectors - return the value to the normal range by making adjustments in the same direction (positive feedback) or opposite direction (negative feedback) of the stimulus.

In the body’s thermoregulation mechanism, a negative feedback loop is used in which the variable is body temperature. The nerve endings in the skin that are sensitive to changes in temperature are called heat-sensitive thermoreceptors. They detect changes in body temperature and produce nerve impulses that signal the hypothalamus in the brain. The hypothalamus is the control center that compares the body temperature with the normal range and activates and controls different effectors such as muscles, blood vessels, adrenal glands, sweat glands, etc. These effectors controlled by the hypothalamus perform certain physiological activities that can return the body temperature to normal range.

When body temperature drops, the hypothalamus activates and control the effectors such as blood vessels to constrict in order to decrease the flow of heat to the skin, muscles to shiver in order to increase the production of heat, adrenal glands to secrete hormones (norepinephrine and epinephrine) in order to increase metabolic rates and heat production. All these effects cause the body temperature to increase and return to normal.

When body temperature rises, the hypothalamus activates and controls the effectors such as blood vessels to dilate in order to increase the flow of heat to the skin, sweat glands to release sweat, which on evaporation cools the skin. All these effects cause the body temperature to decrease and return to normal.

8 0
3 years ago
What is a hypotheses
Luden [163]

Answer:

An educated guess before doing an experiment

3 0
3 years ago
Read 2 more answers
What are gross primary production and net primary production and how do they dilter? Why is this an important measure?​
Reptile [31]

Answer:

food stuff and building materials

Explanation:

why is because the produce food stuff more than buidling materials

4 0
2 years ago
Other questions:
  • Match the following.
    5·2 answers
  • Ferns contains all of the structures listed EXCEPT A) roots B) seeds C) leaves D) vascular tissue
    14·2 answers
  • Which of these correctly describes how organic catalysts operate in biological reactions?
    6·1 answer
  • Please help me it’s due tomorrow
    12·1 answer
  • The part of Earth that supports life is a(n) ____.
    15·2 answers
  • Help plssss?!!!!!!!!!
    7·1 answer
  • Which macromolecule makes up the main structure of the cell membrane?
    11·1 answer
  • 10) COMPRESSIVE STRESSES, GRANITIC MAGMAS, AND
    15·1 answer
  • Which pair are the correct base pairs in DNA?
    15·1 answer
  • What happens when oxygen comes in contact with NOx and VOCs?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!