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dimulka [17.4K]
4 years ago
10

The ras proto-oncogene can become an oncogene by a single point mutation that alters its protein product to have _______ activit

y.
A. more GTPase
B. less nucleotide exchange
C. greater nucleotide exchange
D. constitutive Raf-activation
Biology
1 answer:
34kurt4 years ago
7 0

Answer:

The correct answer is D.

Explanation:

The Ras Proto-Oncogene is a gene found in normal cells, which by the single point mutation mentioned in the question, can turn into Oncogene. Because Proto-Oncogene is a gene that controls and regulates the division of the cell, a mutation in this gene leads to uncontrolled cell divisions which then leads to cancer. The correct answer is D since RAF-Activation describes "Rapidly Accelerated Fibrosarcoma, fibrosarcoma being a cancer which affects fibrobalst cells.

I hope this answer helps.

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if the item was marked up by 1/2 before it was placed on the sales floor, what was the price that the store paid
shusha [124]
Let the item be x

x=30.00

half of 30 is 15

add 15

get your answer 45.00

fill in x with the real number
8 0
3 years ago
The storm gutters of a large city empty into an ocean bay. A mechanic shop, unable to afford proper disposal, begins dumping its
lesantik [10]

Answer:

The correct statement is C. The pollutants will disrupt oxygen absorption in fish.

Explanation:

Motor oil and other fuels when dispose off in the water bodies, it causes suffocation in the marine animals and causes death. Motor oil or other fuel such as petrol, diesel etc are non polar solvent and water is a polar solvent so they are not dissolve with each other and the oil make a layer on the water surface and blocks oxygen.

5 0
4 years ago
What are the different types of limiting factors found in nature?
disa [49]

1. the availability of food, water, shelter and space.

2. Common limiting factor resources are environmental conditions that limit the growth, abundance, or distribution of an organism or a population of organisms in an ecosystem. The limiting factor also causes competition between individuals of a species population.

Example: Space, food, or water.

3. Limiting factors, such as food, would sometimes cause one organism to kill another to survive or fight over that factor. But with space, it would get crowded probably.

4. ( i couldn't find anything about South America Ecosystems Interactive... sorry )

5. "Native people" are ethnic groups who are the original inhabitants or descendants of the original people.

Example: the Yanomami and the Tupi People of the Amazon.

6. I would say do an experiment or something???

7. A variable is any factor, trait, or condition that can exist in differing amounts or types.

8. The dependent variable is what is being measured in an experiment or evaluated in a mathematical equation. The dependent variable is also called the outcome variable.

9. A typical use of a control group is in an experiment in which the effect of a treatment is unknown and comparisons between the control group and the experimental group are used to measure the effect of the treatment.

Example: when testing for a new pill, one group is given the pill to see affects, one group (the control group) is given a placebo and is used to see what happens when given a placebo.

10. Changes in limiting factors will cause a population to decrease.

11. They are transmitted from indirect contact usually.

12. An animal or plant on or in which a parasite or commensal organism lives.

Example: When a human doesn't wash his/her hands and that makes someone else sick. Another one is since humans naturally have bacteria, some are bad and can cause a virus.

13. An infectious agent is something that infiltrates another living thing.

14. Lack of membrane-bound organelles, unicellular, and small.

15. cocci, bacilli, and spirilla.

16. Viruses can replicate only by infecting a host cell and they cannot reproduce on their own.

17. Influenza, HPV, and rabies.

18. Any of a group of unicellular, multicellular, or syncytial spore-producing organisms feeding on organic matter.

Example: Pink waxcap, coral tooth, and pig's ear. (this is not their scientific name haha)

<em>I hope this helps :D</em>


4 0
3 years ago
Neurons are constantly firing on a regular basis in order to keep your body functioning. In your words, describe how a neuron ut
Gelneren [198K]

Answer:

Neurons are in charge of receiving stimuli from the environment, transforming them into nervous excitations and transmitting them to the nerve centers, where they organize themselves to give a response.The cycle of depolarization and hyperpolarization of the membrane and return to the resting membrane potential is called the action potential, an all-or-nothing reaction that can occur at rates of up to 1,000 pulses / second. Membrane depolarization that occurs as voltage gate Na + channels open at one point on an axon passively spreads a short distance and triggers the opening of adjacent channels, resulting in the generation of another action potential. In this way the depolarization wave, or nerve impulse, is conducted along the axon.

Explanation:

Neurons are highly specialized cells whose central function consists in the generation and transmission of signals, in order to communicate with the other neurons of the nervous system and with the outside of the organism. They are made up of three parts: the cell body, the dendrites, and the axon. Dendrites are extensions of the cell body with short, tubular branches, through which each neuron receives signals from other neurons. These signals are added or averaged, and in the event that the total intensity of the received stimulus is greater than a certain threshold, the neuron will generate and emit an electrical response signal. This signal will be sent through the axon, which will transmit the information to other neurons through chemical exchange. The axon divides near the end into thin branches that contact other neurons. The point of contact is called the synapse. At the synapse, there is a gap between the two cells called the synaptic cleft. The synapse is produced by the release of chemicals from the presynaptic neuron that excites the postsynaptic, transmitting the informational code. The arrival of an impulse at the end of a nerve fiber causes a chemical compound, a transmitter substance, to be released, which excites the neighboring neuron. The same neuron may have inhibitory and excitatory connections with different neurons, for which it will need to produce different chemicals that act as transmitters. A neuron receives and integrates multiple stimulations through the synapses, those received by the dendrites are added to those received in the soma so that the electrical potential of the cell membrane ends up exceeding the threshold and originates a nerve impulse in the area of ​​the axonal cone. Nerve impulses are electrical signals generated by the spike trigger sites (axon cones) of a neuron as a result of membrane depolarization, which are conducted along the axon to its termination. The transmission of impulses from the endings of a neuron to another neuron, a muscle cell or a gland occurs at the level of the synapses.

6 0
3 years ago
NEED HELP ASAP due today
Ann [662]

Answer:

A river forms from water moving from a higher elevation to a lower elevation, all due to gravity. Flowing water finds its way down a slope initially as small creeks. As small creeks flow downhill they shape larger streams and rivers. Rivers eventually end up flowing into the oceans with much more speed than was originally there.

Hope it helps and I did it correctly and used that words I needed to.

7 0
3 years ago
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