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2 years ago

Deﬁne mutation and mutagen.

1 answer:

4 0

Mutations. Definition. A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.

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What role does animal agriculture play in our state and local economy? Explain and support with specific examples.

Romashka [77]

Answer:

Kindly check explanation

Explanation:

Animal agriculture simply refers to the extensive use of various cattles , birds and other animals and their derivative in contributing to the growth and development of the economy and it's populace. In the most evident of cases and scenarios, we can establish that animal agriculture plays important role in the economy which include but not limited to being an integral source of revenue for the state and local economy, provision of jobs and subsequent reduction in level of unemployment, an important source of protein such as meat, fish, poultry birds, eggs and so on.

Even in the most developed of economies, agriculture continues to be a main point of focus in most countries, contributing immensely to the GDP of the nation. Animal agriculture could be practiced from a relatively low scale level which has made it easy for individuals to be self employed and a resulting reduction in level of unemployment.

3 0

2 years ago

Would you expect the stomata of a desert cactus or the stomata of a water lily plant to close during the day?

BartSMP [9]

A water lily will have more stomata. A desert cactus will have very few stomata, because in deserts plants face water shortage so in order to avoid loss of water cacti have adapted to the desert environment by possessing few stomata.

5 0

3 years ago

A plant population produces many seeds. that if a population of plants is currently 30 individuals, and rmax= 12 plants/month, t

LiRa [457]

Answer:

$\frac{dN}{dt} =$ 14130

Explanation:

Logistic growth is a measure of continuous growth of a population of individuals in such an environment where the resources are limited. Such type of growth pattern has a characteristic growth curve which is S-shaped or sigmoidal.

The equation for logistic growth is as follows -

Change in population size = $\frac {dN}{dt} = rN(K- \frac {N}{K})$

Where,

N = size of population

r = intrinsic rate of increase

K = carrying capacity

The values of r, N and K are given in the question as 12, 30 and 40 respectively.

So,

$\frac{dN}{dt} = 12 \times 30(40 - \frac{30}{40}) = 14130$

5 0

3 years ago

Why would cannibalism be favored by natural selection?

crimeas [40]

Answer: Because if we assume the cannibal has to fight to the death then the stronger will win and the weaker will die off.

Explanation:

5 0

3 years ago

Which gland produces T3 and T4?

Leokris [45]

Answer:

1. The gland that produces T3 and T4 is the thyroid (first option).

2. True. The adrenal gland produces and allows the secretion of the hormone involved in the fight and flight response.

3.The symptom that is not correctly matched with the organ system is joint pain, which is related to the joint system, not the skeletal system.

4. False. Negative feedback loop inhibits the production and release of hormones.The symptom that is not correctly matched with the organ system is Joint pain - skeletal system

Explanation:

1. Thyroid gland is a small organ of no more than 30 grams found in the neck, in front of the trachea. This gland produces thyroglobulin, which when joined with iodine can synthesize triiodoythyronine (T3) or thyroxine (T4).

The main function of the thyroid gland is the regulation of organic metabolism, while it can also mediate the body's response to other hormones.

2. Adrenal gland is located in the upper pole of each kidney and is responsible for the secretion of several substances that help with the body's activity.

In the gland's marrow, a substance called adenaline is produced, with properties such as hormone and neurotransmitter, one of the main substances produced to deal with stress and the adaptation response called fight and flight.

The adrenaline produced in the adrenal medulla can strengthen muscles, increase heart rate and blood pressure, and increase the body's resistance to the presence of stressors or threats to physical integrity.

3. Joint pain is related to inflammation of the joint soft tissues, which belong to the joint system. Unlike joint pain, bone pain occurs as a result of injury to the periosteum -the thin membrane that covers the bones- which is related to the skeletal system.

Painful inflammation of the joints is called arthritis, and is one of the main causes of disability to perform normal body movements.

4. Feedback is a control mechanism of the endocrine system. Negative feedback loop occurs in response to a stimulus, resulting in the inhibition of mechanisms that promote the synthesis and release of substances.

An example of negative feedback is the sufficient production of thyroid hormones, which sends a signal to the hypothalamus, which in turn inhibits the production of TSH - thyroid stimulating hormone - at the level of the pituitary gland. If the pituitary does not release TSH, production of thyroid hormones ceases.

Learn more:

Thyroid feedback loop brainly.com/question/4967372

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2 years ago