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
elena-14-01-66 [18.8K]
3 years ago
13

Which organelle is not found in plant cells? vacuoles mitochondria chloroplast centrioles

Biology
2 answers:
garri49 [273]3 years ago
6 0
The answer is centrioles.

Hope this helps!!
Sladkaya [172]3 years ago
6 0
<span>not found in plant cells
centrioles.</span>
You might be interested in
HELP ASAP
mamaluj [8]

Answer:

1.True

2.True

Explanation:

8 0
2 years ago
Which of the following statements about the law of conservation of matter is correct?
Naddik [55]

Answer:

3, Matter cannot be created or destroyed, only transformed

5 0
3 years ago
Read 2 more answers
A poisonous substance enters the food chain through the soul. This substance doesn't break down in the bodies of living organism
Alecsey [184]

Explanation:

Biomagnification, also known as bioamplification or biological magnification, is any concentration of a toxin, such as pesticides, in the tissues of tolerant organisms at successively higher levels in a food chain.[1] This increase can occur as a result of:

Persistence – where the substance cannot be broken down by environmental processes

Food chain energetics – where the substance's concentration increases progressively as it moves up a food chain

Low or non-existent rate of internal degradation or excretion of the substance – mainly due to water-insolubility

In biomagnification the concentration of the persistent toxins (crosses) increases higher up the food chain.

In this scenario, a pond has been intoxicated. As we go further into the food chain, the toxin concentration increases, causing the top consumer to eventually die of intoxication.

Biomagnification is the build up of toxins in a food chain. The DDT concentration is in parts per million. As the trophic level increases in a food chain, the amount of toxic build up increases. The x's represent the amount of toxic build up accumulating as the trophic level increases. Toxins build up in organism's fat and tissue. Predators accumulate higher toxins than prey.

Biological magnification often refers to the process whereby certain substances such as pesticides or heavy metals work their way into lakes, rivers and the ocean, and then move up the food chain in progressively greater concentrations as they are incorporated into the diet of aquatic organisms such as zooplankton, which in turn are eaten perhaps by fish, which then may be eaten by bigger fish, large birds, animals, or humans. The substances become increasingly concentrated in tissues or internal organs as they move up the chain. Bioaccumulants are substances that increase in concentration in living organisms as they take in contaminated air, water, or food because the substances are very slowly metabolized or excreted.

Contents

Processes Edit

Although sometimes used interchangeably with "bioaccumulation", an important distinction is drawn between the two, and with bioconcentration.

Bioaccumulation occurs within a trophic level, and is the increase in the concentration of a substance in certain tissues of organisms' bodies due to absorption from food and the environment.

Bioconcentration is defined as occurring when uptake from the water is greater than excretion.[2]

Thus, bioconcentration and bioaccumulation occur within an organism, and biomagnification occurs across trophic (food chain) levels.

Biodilution is also a process that occurs to all trophic levels in an aquatic environment; it is the opposite of biomagnification, thus when a pollutant gets smaller in concentration as it progresses up a food web.

Lipid, (lipophilic) or fat soluble substances cannot be diluted, broken down, or excreted in urine, a water-based medium, and so accumulate in fatty tissues of an organism, if the organism lacks enzymes to degrade them. When eaten by another organism, fats are absorbed in the gut, carrying the substance, which then accumulates in the fats of the predator. Since at each level of the food chain there is a lot of energy loss, a predator must consume many prey, including all of their lipophilic substances.

For example, though mercury is only present in small amounts in seawater, it is absorbed by algae (generally as methylmercury). Methyl-mercury is the most harmful variation of mercury. It is efficiently absorbed, but only very slowly excreted by organisms.[3] Bioaccumulation and bioconcentration result in buildup in the adipose tissue of successive trophic levels: zooplankton, small nekton, larger fish, etc. Anything which eats these fish also consumes the higher level of mercury the fish have accumulated. This process explains why predatory fish such as swordfish and sharks or birds like osprey and eagles have higher concentrations of mercury in their tissue than could be accounted for by direct exposure alone. For example, herring contains mercury at approximately 0.01 parts per million (ppm) and shark contains mercury at greater than 1 ppm.[4]

DDT is thought to biomagnify and biomagnification is one of the most significant reasons it was deemed harmful to the environment by the EPA and other organizations. DDT is stored in the fat of animals and takes many years to break down, and as the fat is consumed by predators, the amounts of DDT biomagnify. DDT is now a banned substance in many parts of the world.[5]

7 0
3 years ago
Allen is an 82-year-old retiree who recently relocated to senior apartments. The apartments are not affiliated with any religiou
andrezito [222]

Answer:

Separation from spiritual ties.

Explanation:

Spirituality may be defined as the belief towards the religion or the religious process that helps to find the individual identity of the man. The spirituality might also represent the Holy spirit in Christians.

The spirituality is helpful for the connection of the individual with its religion. The esoteric traditions and religious traditions are involved in the spirituality. Allen do not attend the mass implies that he might be separating from the spiritual ties and loses his belief from the religion.

Thus, the answer is separation from spiritual ties.

6 0
3 years ago
Recall that the biological species concept defines a species as a group of populations whose members have the potential to inter
Ivanshal [37]

Answer:

Population A: K, D, F, H, I

Population B: L, E

Population C: G, J

Explanation:

Biologists studying disease susceptibility in mice used genetic techniques to look for gene flow in 12 wild populations of mice. The populations (designated A through L) were located along a 210-km transect line.

3 0
3 years ago
Other questions:
  • Consider a population of frogs. Allele B1 codes for spotted frogs; allele B2 codes for non-spotted frogs. B1 is dominant to B2 .
    5·2 answers
  • Please help me I need help badly!
    11·1 answer
  • All living things are either Eukarya, Bacteria, or Archaea. These three broadest categories in the classification of life are ca
    13·2 answers
  • Which of the possible examples below would most likely lead to a change in the cell theory?
    8·1 answer
  • After mitosis are the two new daughter cells diploid or haploid?
    12·2 answers
  • Looking at the Punnett square, list the possible phenotypes and frequencies of
    6·1 answer
  • Limestone REACTING with and being dissolved by acid rain is an example
    7·1 answer
  • Which item would have the largest weight on Earth?
    13·2 answers
  • Why are nucleic acids essential for life
    12·1 answer
  • These diverticula are lined with transitional cell epithelium.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!