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babunello [35]
2 years ago
6

A medical researcher is investigating the chemical and physical properties of substance that she isolated from the surface of ch

arcoal-grilled meat. When the scientist mixes a small amount of the substance with living human cells, the chemical causes the rapid breakdown of the cells' plasma membranes. She is able to prevent this reaction by adding vitamin C to the mixture of the substance chemical and cells. Based on this information, the scientist has
Biology
1 answer:
LekaFEV [45]2 years ago
4 0

Answer:

the scientist has determined that the chemical isolated from charcoal-grilled meat is an oxidant.

Explanation:

oxidants are oxidizing agents. oxidants have the capacity to damaging living cells. vitamin C on the other hand is an active antioxidant, hence it was able the breakdown of the cells.

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Which of the following is true for subtropical jet streams?
Kamila [148]

Answer:

A

Explanation:

A. They bring cool air

3 0
2 years ago
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List the name for the elements making up cytosine?
s2008m [1.1K]
Medal i believe because i looked it up
6 0
2 years ago
The Lotka-Volterra model produces consistently identical cycles because it is deterministic. The lynx and hare simulation on the
Setler [38]

Answer:

B. In the real world, random and unpredictable events occur, so the Lotka-Volterra parameters vary over time

Explanation:

Lotka-Volterra equations are mathematical models that explain biological prey-predator interactions among two species, considering the following assumptions,      

  • The ecosystem is isolated and closed. There is no migration.
  • The whole individuals are reproductively equivalent.
  • In the absence of the predator, prey shows an exponential growth rate. The prey is in the ideal environment.
  • In the absence of the prey, the predator population decreases exponentially.  The predator environment is also ideal, but it is limited by the prey density.  
  • The predation rate is proportional to the encounters rate, which also depends on density.
  • The predators affect the prey populations, making it decrease proportionally to the number of prey and predators present.
  • The prey population also influence the predator population, proportionally to the number of encounters between the two species.

In these equations, the variable D is the number of predators, and P the number of preys.

The parameters are always constant:  

  • r1: prey growth rate.
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  • r2: predator growth rate.
  • a2: the success of the predator in hunting and feeding.

In nature, there are many factors affecting interactions. Dense-dependent factors and dense-independent factors. Also in reality there are stochastic factors. <em>Stochasticity refers to the variability in the system involving those factors that are affecting or influencing the population growth. Stochasticity might be related to good years and bad years for population growth.</em>

In a real situation, the compliance of the whole assumptions does not occur. The previously mentioned constants might vary, changing continuously the interaction among the predator and the prey. These parameters change in different degrees, resulting in different circumstances for both species.  

6 0
2 years ago
Place the following events of excitation in the correct order. 1) ion channels on the sarcolemma open and sodium ions enter the
Gre4nikov [31]

Answer:

4, 3 5, 1, 2.

Explanation:

The events of muscle contraction begins from the presynaptic neuron, which cause the influx of Ca+, and the release of acetycholine neurotransmitter  into the synaptic cleft.

The Ach, binds with the receptors in the sarcolemma, leading to opening of Ligand gated Na+ channels. Therefore Na+diffuses in, causing depolarization, and propagation of action potential along the sarcolemma  spreading to the  T-tubules.

This is followed by opening of Calcium channels leading  exist of Ca+ from the sarcoplasmic reticulum.

The Calcium binds with the troponin, and  Tropomysoin exposed the myosin binding sites  on the actin filament.Thus cross-bridge is formed by the myosin head  with thin filaments which   shortened the sarcomere, leading to contraction of muscle fibres.

6 0
2 years ago
A researcher is studying a population of mutant fibroblasts that fail to flatten and attach to extracellular matrix proteins on
Vladimir79 [104]

Answer: Components of cell junctions

Explanation:

<u>Fibroblasts are cells located in the dermis,</u> responsible for the formation and remodeling of tissue. They synthesize fibers and maintains the extracellular matrix of the tissue of animals. So, t<u>he extracellular matrix is a structurally complex entity that surrounds and supports the cells found in tissues</u>.

A cell junction a structure that exists within the tissues of animals and they consist of protein complexes that provide contact between cells or between a cell and the extracellular matrix. So if the cells do not appear flattened and do not attach to the extracellular matrix, then there is a problem with the components of cell junctions, which are mostly proteins as it was said before. And since proteins are coded by genetic information stored in DNA, then if there is a mutation in any of those genes, the fibroblast will fail to attach because the protein of the cell junction will be abnormal.

6 0
2 years ago
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