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
UNO [17]
3 years ago
15

What is the impact of life skill to you? A. To be able to create problems B. To be self assertive. C. To be influenced by friend

s D. To maximize risk in life situation.​
Biology
1 answer:
PIT_PIT [208]3 years ago
6 0

Answer:

To self assertive

Explanation:

Gives you confidence and advance on you're own personality and views.

You might be interested in
A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 5 million years. How many years
gregori [183]

Answer:To put dates on events in evolutionary history, biologists count how many mutations have accumulated over time in a species’ genes. But these “molecular clocks” can be fickle. A paper in the 28 September Physical Review Letters mathematically relates erratic “ticking” of the clock to properties of the DNA sequence. Researchers may eventually use the results to select which genes make the best clocks.

Although mutations in DNA are rare, they are crucial for evolution. Each mutation in a gene changes one small piece of a protein molecule’s structure–sometimes rendering it non-functional and occasionally improving it. The vast majority of mutations, however, neither hurt nor help, often because they affect an unimportant part of their protein. Such a “neutral” mutation usually dies out over the generations, but occasionally one proliferates until virtually every individual has it, permanently “fixing” the mutation in the evolving species.

Over thousands of generations, these fixed mutations accumulate. To gauge the time since two species diverged from a common ancestor, biologists count the number of differences between stretches of their DNA. But different DNA segments (genes) often give different answers, and those answers differ by much more than would be expected if the average rate of mutations remained constant over evolutionary time. Sometimes they also disagree with dates inferred from fossils. Now Alpan Raval, of the Keck Graduate Institute and Claremont Graduate University, both in Claremont, California, has put precise mathematical limits on this variation.

Raval’s work is based on representing possible DNA sequences for a gene as a network of interconnected points or “nodes.” Each point represents a version of the gene sequence that differs by exactly one neutral mutation–a single DNA “letter”–from its immediate neighbors. The network contains only neutral mutations; non-functional versions of the sequence aren’t part of the network.

Models and simulations had suggested that if the number of neighbors varies from point to point–that is, if some sequences allow more neutral mutations than others–mutations accumulate erratically over time, making the molecular clock unreliable. Raval calculates precise limits on how unsteady the clock could get, based on properties of the network, such as the average number of neighbors for each node or the number of “jumps” connecting any two randomly chosen nodes. “The great strength of this paper is that it’s now mathematically worked out in much more detail than before,” says Erik van Nimwegen of the University of Basel and the Swiss Institute of Bioinformatics in Switzerland, who developed the framework that Raval uses.

Still, the relevant network properties are “not very intuitive,” van Nimwegen observes. Raval agrees. “The real question from this point on would be to identify what kinds of proteins would be good molecular clocks.” He says that according to his results, for a protein to be a good clock, “virtually all single mutations [should] be neutral”–many neighbors per node–but “as you start accumulating double and triple mutants, it should quickly become dysfunctional.” Raval is working to relate these network features to protein properties that researchers could measure in the lab.

Researchers have suggested other explanations for the erratic behavior of molecular clocks, such as variations in the mutation rate because of changes in the environment. But such environmental changes are relatively fast, so their effect should average out over evolutionary time, says David Cutler of Emory University in Atlanta. He says that in network models, by contrast, changes in the mutation rate are naturally slow because the point representing the current sequence moves slowly around the network as mutations accumulate.

Explanation:

4 0
3 years ago
Read 2 more answers
The transition of light colored moths in an original population into dark colored moths after natural selection occurs is a clas
PolarNik [594]

Answer:you have to subtract it

Explanation:

4 0
3 years ago
Help = brainlist please
son4ous [18]

Answer:

I think it's soil

Explanation:

7 0
3 years ago
Read 2 more answers
In your own words, explain the effect of greenhouse gasses, what can
Orlov [11]

Answer:

Greenhouse gases have far-reaching environmental and health consequences.

8 0
3 years ago
The caplike structure on a sperm cell that helps aid egg penetration is called the
madreJ [45]
I think it's called the Acrosome
7 0
3 years ago
Other questions:
  • The dog family is Canidae. Some well-known members of the dog family are the domestic dog, Canis familiaris; the coyote, Canis l
    7·1 answer
  • Nothing is unlimited. Will humans ever run out of food and die out? Much like the Food Pyramid?
    9·1 answer
  • People once belived organisms could grow from food or dirt.How might the scientific study of cells have affected this view?
    7·1 answer
  • DNA replication is called semiconservative because
    7·1 answer
  • How does a net force of zero affect an objects state in motion?
    15·1 answer
  • What types of antigen do mature t cells normally not recognize?
    13·1 answer
  • Prairie dogs live in underground burrows to find a mate and have babies. Which characteristic of life is exhibited by the prairi
    15·2 answers
  • The polysaccharide that is responsible for the strong structural nature of plant cell walls is
    9·1 answer
  • The study of the cells in gastric pits is an example of.
    11·1 answer
  • Which of the following is true about protein molecules?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!