Senescence of the eyes is often demonstrated by the presence of

Answers

Answer 1

Senescence is a form of cell-cycle arrest that is first identified in cells at the end of their replicative lifespan and linked to tumor suppression and aging. They are demonstrated by the presence of senescent cells that are non-proliferative and in the forms of fibroblasts or lens fibre cells. In addition, they could be induced prematurely by oncogenes in primary cells, inducing oncogene-induced senescence.

Answer 2
Senescense is the loss of ability of cells to divide as well as grow and function that would end in death. The cause of this is unknown yet hereditary can play a role. Other theories would include free radicals as well as protein abnormalities. Answer on this question is decrease in visual acuity.

Related Questions

A large explosion that takes place at the end of a star’s life cycle is called a ____________.
big bang
supernova
nebula
nuclear reaction

Answers

the answer is b supernova 

I'm pretty sure sure the answer is supernova

A student is asked to draw a food web in which the same organism is a primary consumer as well as a secondary consumer. how should the organism be represented in the food web?
a. the organism must have an arrow pointing from it to a tertiary consumer and another arrow pointed from it to a decomposer.
b. the organism must have an arrow pointing from it to a secondary consumer and another arrow pointing to it from the top predator.
c. the organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer.
d. the organism must have an arrow pointing from it to primary consumer and another arrow pointing away from it to a decomposer.

Answers

The correct anwser  is C.

Answer:

C. The organism must have an arrow pointing to it from a producer and another arrow pointing to it from a primary consumer.

Explanation:

"do b-cells ever interact with pathogens that have infected a cell"

Answers

I think they don't; they only interact with free-floating pathogens. B-cells directly bind to free-floating pathogens. B-cells function in the humoral immunity component of the adaptive immune system by secreting antibodies. BCRs allow the B cells to bind to a specific antigen, against which it will initiate an antibody response. 

Flexor and extensor muscles work _______ to operate the joint.

Answers

Flexor and extensor muscles work antagonistically to operate the joint.

Flexor and extensor muscle work in the different direction. This will be called antagonist muscle because their force will cancel each other. It is important to have antagonist muscle because muscle could only shorten, thus could only move the body in one direction. Having two antagonist muscle will allow 2  moving direction

Definition: this is the process of organisms adapting to their environments over time.

Answers

Adaptation through natural selection
The answer is indeed natural selection.

This is the evolutionary process by which beneficial adaptations increase over time in a population due to increased survival and reproductive success of individuals with those adaptations.

Hope this helps! I'm happy to help with any other questions you might have :)

Cleavage as part of embryonic development is distinctive because it involves ________.

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Cleavage as part of embryonic development is idiosyncratic since it involves the cell division which includes the process of mitosis with minimal or no growth in successive divisions. Hope this is right and the correct answer you are looking for.
Answer: cell division by mitosis with little or no growth between successive divisions

Cell divisions in the embryonic development happen fast. This makes the cells don't have enough time to grow its membrane and its organelles. The lack of growth makes the cell size seems smaller as the division keep happening. 

an energy pyramid illustrates that energy is a form of _____is lost to the surrounding as it is passed from one organism to the next???

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An energy pyramid illustrates that energy in the form of heat is lost to the surrounding as it is passed from one organism to the next. In an energy pyramid energy is passed from one trophic level to the next, however, only ten percent of the energy in a given trophic level is passed to the next, as most of the energy is lost inform of heat to the surroundings. 

Reductions in the population size of the graceful antelope, a hypothetical species, has led to inbreeding. deleterious after-effects of that inbreeding are leading to further decreases in the population size of this species. this pattern is an example of a(n)

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The answer is an extinction vortex. This occurs when a population is too small to recover its population hence plummets into extinction.  This is because the population does not have a diverse genotypes on which natural selection can act on to enable the population to adapt. Additionally, the chances of homozygosity for recessive alleles is high hence decreasing the population even further.

​amenorrhea is a condition in which a female experiences excessive flow during menstruation.

Answers

The answer would be false



Hair and nails are apart of the ________ system

Answers

The Integumentary System. I might be wrong but I just looked it up and that's the answer I got. Hope it helps:)

integumentary system!

Which of these organizations acknowledges that the threat to wildlife and biodiversity is greater today than ever before ?
A. Convention on biological diversity
B. The fans at convention
C. World trade organization
D. Convention on international trade in endangered species

Answers

The organization that acknowledges that the threat to wildlife and biodiversity is greater today than ever before is the Convention on Biological Diversity which is in option A.

what is Convention on Biological Diversity ?

The Convention on Biological Diversity (CBD) acknowledges that the threat to wildlife and biodiversity is greater today than ever before. The CBD is an international treaty signed by 196 countries, which aims to conserve biodiversity, promote sustainable use of its components, and share benefits from genetic resources in a fair and equitable way. The CBD recognizes that human activities such as deforestation, climate change, pollution, and overfishing have a significant impact on the natural world and threaten the survival of many species

Hence, the organization that acknowledges that the threat to wildlife and biodiversity is greater today than ever before is the Convention on Biological Diversity which is in option A

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"tobacco smoke is responsible for what percentage of lung cancer deaths?"

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It has been estimated that active tobacco smoking causes close to 90% of lung cancer cases and is the cause of 87% of lung cancer deaths.

How can you determine if your cardiovascular system is becoming more fit?

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To determine if the cardiovascular system is becoming more fit as a result of fitness program, the resting heart rate should be going slower. Cardiovascular system is the system of the body that allows the circulation and transportation of nutrients, oxygen, hormones, carbon dioxide through out the body. It includes the blood vessels, the lungs, the heart and the blood.

What is the process within a genetic algorithm of randomly trying combinations and evaluating the success (or failure) of the outcome?

Answers

The genetic algorith uses AnO(34), a standard formula used by many biological processes throughout the united States of America.

The ________ functions in the control of movements of the upper legs and the trunk. corticobulbar pathway rubrospinal tract lateral corticospinal tract ventral corticospinal tract spinothalamic tract

Answers

The right option is lateral corticospinal tract

The lateral corticospinal tract functions in the control of distal muscles such as those of the limbs and the trunk. About 90% of the fibers that travel in the corticospinal tract are found in the lateral corticospinal tract which makes it the main component of the corticospinal tract.






Final answer:

The ventral corticospinal tract is tasked with controlling movements of the trunk and upper legs. It coordinates both sides of the body for movement and posture, particularly influencing the axial muscles of the trunk.

Explanation:

The ventral corticospinal tract functions in the control of movements of the upper legs and the trunk. This tract is part of the corticospinal tract, which is a major descending pathway responsible for the conscious or voluntary movements of skeletal muscles. Movements of the body trunk are coordinated by the anterior corticospinal tract, which affects both axial and appendicular (limb) muscles but is particularly important for postural muscles that control broad movements of the body. The ventral corticospinal tract does not decussate at the level of the medulla and thus primarily influences movements on the same side of the body. These axons remain anterior as they travel through the brain stem and spinal cord, synapsing with lower motor neurons in the medial regions of the ventral horn, which control the axial muscles of the trunk.

The dorsal fin of a shark is _____ to the dorsal fin of a dolphin. this anatomical feature is the result of convergent evolution (i.e., adaptation to similar environmental pressures).

Answers

Answer:  "analogous" .
___________________________________________________

Explain why lightning strikes can be dangerous even when an individual is not directly struck

Answers

Because when not directly hit an energy field with heat is created The heat can cause radiation.
Final answer:

Lightning poses threats beyond direct strikes due to three primary reasons: ground currents, side flashes, and the concussive force generated by the sudden expansion of superheated air.

Explanation:

Even if you are not directly struck by lightning, it still poses several dangers. One such danger is the ground current generated. When lightning hits the ground, the electrical charge spreads outwards through the ground. If you are standing in the area where the charge is spreading, you could potentially get a severe electric shock.

Secondly, lightning can cause side flashes. This happens when the lightning strikes a taller object and a portion of the current jumps from the object to a nearby person. Thirdly, concussive force can be created in the seconds following a lightning strike. A strike can superheat the air around it, causing a strong shock wave that can cause injuries to the ear or even physical displacement.

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Species are disappearing almost a thousand times faster than they are forming. What is the main cause?

Answers

The answer is Human Impact 

Human Impact       is the answer

Normal fruit flies have brownish-yellow bodies, and this body color is dominant. a mutation in the gene for body color can produce flies with an ebony body color. a homozygous normal fruit fly (e
e. is crossed with a homozygous ebony fruit fly (ee). what is the predicted outcome of this genetic cross

Answers

Crossing a homozygous normal brownish-yellow body fruit fly (ee) with a homozygous ebony body fruit fly (ee) will result in all offspring being heterozygous (Ee) with a brownish-yellow body phenotype.


In the genetic cross between a homozygous normal fruit fly with a brownish-yellow body (ee) and a homozygous ebony fruit fly (ee), all offspring will inherit one allele for body color from each parent. Since the brownish-yellow body color is dominant, all the F1 generation will display the dominant phenotype. The predicted genotypic outcome will be 100% heterozygous (Ee) with the ebony body color being masked. Therefore, the phenotypic outcome will be 100% brownish-yellow fruit flies, as the ebony body color is recessive and will not be expressed in the presence of the dominant allele.

A 20-year-old male is hospitalized with a 4-day history of cough and a temperature of 41°c. chest sounds are dull to percussion. a sputum gram stain is non-diagnostic. a blood culture is positive for gram-positive cocci in pairs. the recommended treatment is with __________.

Answers

Penicillin
***********

Name the muscular contractions that force the food downwards

Answers

Peristalsis is the muscle that forces food downwards.

What is the location of the sensory structures that translate things you see into nerve impulses?

A. On the retina
B. On the cornea
C. In the cochlea
D. In the olfactory bulb

Answers

Retina is the location of the sensory structures that translate things one sees into nerve impulses. It is a thin layer of tissue that lines the back of the inside part of the eye. It receives light that has been focused by the lens, then converts it into neural signals, and sends the signals to the brain for visual recognition. 

Almost no species ever reaches its biotic potential—the population size that the species could produce if all individuals survived and produced offspring. anything that prevents the species from reaching its biotic potential is called a

Answers

Out of the following given choices;

A.    symbiote.                                                                   C.  capacity limiter

B.      producer.                                                                  D.  limiting factor

The answer is D. Limiting factors limit the ideal growth rate of a population. Examples of these limiting factors include space (low space) and food (scarce food). These limiting factors would limit the population growth rate either by causing emigration, increases birth rate, and decrease birth rate.

About _______ of all body fluid is within cells and intracellular compartments. A. 1/3 B. 2/3 C. 1/2 D. 1/4

Answers

About 2/3 of all body fluid is within cells and intracellular compartments.   Body fluids (or biofluids) are This is divided between intracellular fluid (ICF) and extracellular fluid (ECF) in a 2 : 1 ratio. Intracellular fluid is within cells and intracellular compartments, while extracellular includes the interstitial fluid (between cells) and the vascular fluid (blood).

Select the correct definition about tissue grafts.
a. allografts are between different species.
b. xenografts are between individuals of the same species.
c. isografts are between identical twins.
d. autografts are between two genetically identical individuals.

Answers

The correct answer is c. isografts are between identical twins.
Isograft is is a graft (transplantation tissue) between two individuals who are genetically identical (monozygotic twins). This is usually very successful transplantation between such two individuals (transplant rejection never occurs). This is because genetically identical individuals have the same major histocompatibility complex, which is usually responsible for the rejection by the adaptive immune system.
Final answer:

The different types of tissue grafts are allografts, xenografts, isografts, and autografts.

Explanation:

The correct definition about tissue grafts is:

Allografts are tissue grafts between individuals of the same species.Xenografts are tissue grafts between different species.Isografts are tissue grafts between genetically identical individuals, such as identical twins.Autografts are tissue grafts taken from one part of an individual's body and transferred to another part of the same individual.

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If a space in the structure is filled with minerals and then the original animal or plant part dissolves it called

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If the original organism decays, leaving an imprint and an empty space, it is calledan exterior mold or simply a mold. If a space in the structure is filled with minerals and then the original animal or plant part dissolves, it is called a cast.

One of the reasons for the success of the smallpox eradication campaign was that
a. smallpox viruses were used in the vaccine.
b. smallpox was not a transmissible disease.
c. smallpox occurred only in humans.
d. smallpox occurred only in south america.
e. smallpox could be treated with antibiotics.

Answers

One of the reasons for the success of the smallpox eradication campaign was that small pox only occurred in humans. Smallpox is an extremely contagious and deadly virus for which there is no known cure. it is caused by two variants, Variola major and Variola minor. it is a disease of the past that was eliminated by worldwide vaccination. 

how can the processes of parasitism and predation be different if they both harm organsims?

Answers

The similarity between predators and parasites is that both acquire energy by taking that energy from other organisms. It positively affects one organism (the predator or parasite) while negatively affects the other organism (the prey or host organism). But, the main difference is that predators tend to kill their prey while parasites don’t. Parasites only take resources from their host.

In an aquatic habitat, an example of organisms from the pioneer community would be - f water reeds g algae h water lilies j grass

Answers

Answer: Algae

Explanation: Just took the test

John went to a picnic. he took home some leftover chicken and rice, heated it on the stove, ate it, and got sick two hours later. john thought the heating made his food safe because it would have killed any bacteria present. he didn't know that __________ produces a heat-stable toxin. view available hint(s)

Answers

Staphylococcus aureus

Staphylococcus aureus is bacterial that causes staphylococcal food poisoning which is one of the most common food-borne diseases. This food poisoning is caused by the ingestion of foods contaminated with enterotoxins produced by staphylococcus aureus. The enterotoxins produced by this organism are able to survive in stomach acids, drying and extreme temperature which makes them heat stable.






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