Animal cells do not have cell walls because they do not need them. Cell walls, which are found in plant cells, maintain cell shape, almost as if each cell has its own exoskeleton. Animals do have a cell membrane though.
What are cell walls?A rigid layer of nonliving material that surrounds the cells of plants and some other organisms. A cell wall is made up of cellulose, pectin, glycoproteins, hemicellulose and lignin. It is the outer boundary of the cell, it encloses the cytoplasm and the organelles of the cells. In plants cells it is inside the cell wall.
Let's take a look at the options:The first one is a tree. A tree is a type of plant and all plants have cell walls and it provides turbidity and durability for the plant. Therefore, a tree has a cell wall eliminating it as a option.The second one is fungi. Fungi are a eukaryotic organism that is usually filamentous (forming a mycelium) and heterotrophic. Fungi have a cell wall made of chitin, a nitrogen containing polysaccharide (NO amino acids) called hyphae. Therefore, fungi have a cell wall eliminating it as a option.The third one is plants. As mentioned before, all plants have cell walls. But to explain more, plant cells are surrounded by a strong cell wall that can change as they grow. It is made of a mixture of polysaccharides cross-linked together, which can give properties like flexibility, strength, turgor and waterproofing. Therefore, plants have a cell wall eliminating it as a option.The last one is animals. Animal cells have a cell membrane instead of rigid walls like plant cells do and that is mainly so they can move. Rigid cell walls don’t move - plants don’t move very much and what movement they do have is very slow and gradual. Animals move constantly - skin has to stretch, muscles must contract and extend. So the cells have to allow for that, and the flexible cell membrane is how they do it. Therefore, the answer is option D.To learn more about cell functions, check out these links:
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Over several years, a scientist successfully isolates a species of flower for white color. this year, when the new generation of flowers blooms, one yellow flower is found in the population. which is the best reason for the appearance of a new flower color within the species?
Answer:
genetic mutation
Explanation:
just took the exam
Complete the sentence.
Warming air temperatures are slowing melting glaciers. As they melt,
O limiting phenomenon
O peak phenomenon
O primary succession
O secondary succession
occurs as new growth spreads on the newly exposed land.
Warming air temperatures are slowing melting glaciers. As they melt,primary succession. Thus, option "C" is correct.
What is succession?Succession is the natural development of a series of biotic communities at the same site. There are two types of succession; primary and secondary.
Primary succession occurs on lifeless unoccupied areas while secondary happens right after that and in there soil and some organism is present already.
Thus, option "C" is correct.
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I passed all my exams because of brainly!
Answer: sheesh
Explanation:
organisms swimming _______ are moving with the flow of water.
A) Downstream
B) Meltdown
C) Turbine
D) Ethanol
E) Passive solar cooling
F) Utility
G) First Law of Energy
H) Refinery
I) Isotopes
J) Second Law of Energy
Answer:
A) Downstream
Explanation:
Hope this helps! ;-)
What are some tropical animals
Answer:
Parrot, Toucan, sloth salt water fish, Jaguar, Reptiles, Harpy eagle and a Orangutans
That's all i got hope that helped
and if you need anything specific let me know i will get it
How can reduced precipitation lead to limited water availability? a. reduced precipitation leads to overuse. b. precipitation is a nonrenewable resource. c. reduced precipitation is a global event. d. reduced precipitation may lead to drought. please select the best answer from the choices provided a b c d
Reduced precipitation lead to limited water availability in such a way that (D). reduced precipitation may lead to drought.
Meaning of PrecipitationPrecipitation can be defined as any form of water either liquid or solid that is formed in the atmosphere and falls down to the earth as rain, snow, hail and sleet.
Precipitation is one of the major part in the global water cycle.
Precipitation is so important because it tends to determine the amount of water that is on earth and in the atmosphere.
In conclusion, Reduced precipitation lead to limited water availability in such a way that reduced precipitation may lead to drought.
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Chance changes in allele frequencies within a population are called:.
Which substances are needed to make food in plants?.
Answer:
To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots. Plants also require water to make their food.
Explanation:
The sequencing of the human genome led to the realization that chromosome 19 contains many genes while chromosomes 13 and Y contain relatively few. What does this finding imply about the density of genes in a genome
Answer:the density will increase
Explanation:
What seasonal response(s) to spring do animals in florida have that give them a better chance of survival?
a. animals begin to gather and store food to prepare for the hot temperatures.
b. animals have no responses to the seasonal changes of warmer temperatures.
c. spring is a season of reproduction and growth for animals. plants begin to grow and provide animals with plenty of food.
d. spring is a season of dormancy. animals will hibernate until they have more water, sun, and food.
Sequence the steps in how a nerve impulse moves from one neuron to another neuron, by writing the numbers 1 to 5 in the squares to the left of the steps.
Help me please.
The steps in how a nerve impulse moves from one neuron to another neuron can be describe as dendrite – cell body – axon.
How does the nerve impulse occur?The nerve impulse starts when the neuron experiences a stimulus strong enough to trigger it. This happens when a membrane is at resting potential, a condition where the inner surface of the membrane is negatively charged relative to the outer surface.
In this case, the correct steps will be in a neuron, the stimuli always propagate in the same direction: they are received by the dendrites, travel through the cell body, travel along the axon and, from the end of this, are passed to the next cell (dendrite – cell body – axon).
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Which of these is made up of organs?
Choose 1 answer:
(A) a cell
(B) an organ system
(C) a tissue
Answer:
Organ System
Explanation:
A group of cells make a tissue.A group of tissues make an organOrgans combined together form an organ system.An organ system is made up of organs.
What are organ systems?An organ system is a biological system consisting of a group of organs that work together to perform one or more functions. Each organ has a specialized role in a plant or animal body, and is made up of distinct tissues.
Moreover, the 11 organ systems include the integumentary system, skeletal system, muscular system, lymphatic system, respiratory system, digestive system, nervous system, endocrine system, cardiovascular system, urinary system, and reproductive systems.
Hence, they are Integumentary System, Skeletal System, Muscular System, Nervous System, Endocrine System, Cardiovascular System, Lymphatic System, Respiratory System, Digestive System, Urinary System, and Reproductive System (Female and Male).
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Multicellular fungi have a _
Answer:
Multicellular fungi reproduce by making spores. Mold is a multicellular fungus. It consists of filaments called hyphae that can bunch together into structures called mycelia. Several mycelia grouped together are a mycelium and these structures form the thallus or body of the mold.
Explanation:
hope it's helps^^
Answer:
The vast majority of fungi are multicellular. Most of the body of a fungi is made from a network of long, thin filaments called 'hyphae'. Hyphae filaments are made from tubular cells that connect end on end. Each cell is surrounded by a cell wall composed of a compound called 'chitin'.
Explanation:
The organs of the urinary system include:.
The main organs of the urinary system are the kidneys, renal pelvis, ureters, bladder and urethra.
question; both trypanosoma and plasmodium are different in .......
a) type of nucleus
b) ability to move
c) mode of nutrition
d) phylum they belong to
The diagram represents several stages of the cell cycle.
G,
s
G
M
During the cell cycle, normal cells exit the G1 phase and enter the Go phase where they rest. Typically,
cells will reenter the cycle at G1 prior to going on to S phase. However, abnormal cells such as cancer
cells, may not be allowed to enter the Go phase to rest.
As a result, these cells will most likely -
F. mutate during G2 phase
G. continuously repeat the cycle
H. die after DNA replication
J. fail to complete mitosis
Abnormal cells such as cancer cells, may not be allowed to enter the G0 phase to rest. These cells will most likely continuously repeat the cell cycle.
What do you mean by Cell cycle?The Cell cycle may be defined as the entire sequence of events happening from the end of one nuclear division to the beginning of the next nuclear division.
The abnormal cell undergoes a repeated cell cycle because they express an enzyme called telomerase that switches the wearing down of chromosome ends.
This happens normally in the cell cycle, and after multiple repeated cycles, such abnormal cell undergoes apoptosis.
Therefore, abnormal cells such as cancer cells, may not be allowed to enter the G0 phase to rest. These cells will most likely continuously repeat the cell cycle.
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In a process called ____________ , genetic material is exchanged between homologous chromosomes. This occurs during this stage of cell division: ____________ .
In a process called crossing over, genetic material is exchanged between homologous chromosomes. This occurs during the prophase stage of cell division.
What is crossing over?Crossing over is the unique process by which genetic material is exchanged between the non-sister chromatids of homologous chromosomes.
Crossing over occurs in the prophase stage of meiosis and ultimately results in the formation of genetic combinations in offspring that are not present in the parents.
Therefore, the process called crossing over, genetic material is exchanged between homologous chromosomes and it occurs during the prophase stage of cell division.
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the structure labeled 2 represents a molecule of
a
DNA
b
mRNA
c
tRNA
d
rRNA
Answer:
The structure labeled 2 is tRNA, transfer RNA
What is the most basic form of of solar energy
A) passive solar cooling
B) passive solar energy
C) passive solar heating
Answer:B) passive solar energy
Hope this helps
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Carbon is found in all living organisms. the constant flow of carbon on earth through organisms and the air is known as the carbon cycle. plants absorb carbon from the atmosphere in the form of carbon dioxide. they use it for respiration and photosynthesis animals consume plants, transferring carbon along the food chain. plants and animals respire and release carbon into air. when the animals and plants die, they are eaten by carbon enters back into the atmosphere in the form of
According to the research, most of the carbon quickly enters back into the atmosphere in the form of carbon dioxide.
What is the carbon cycle?It is the process that describes the flow of carbon (in the form, for example, of carbon dioxide) in the atmosphere, the ocean, the terrestrial biosphere.
Thus, the CO2 in the atmosphere passes through photosynthesis to the plants, also the cycles of respiration and microbial decomposition intervene, which release new CO2 in gaseous form into the atmosphere.
Therefore, we can conclude that according to the research, most of the carbon quickly enters back into the atmosphere in the form of carbon dioxide.
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Answer:Decomposers an carbon dioxide
Explanation:
Why are meerkats affected by the plant population?
Answer:
They largely depend on it for survival as meerkats are omnivores.
Explanation:
The combined effects of hotter and drier summers and fewer plants would threaten the persistence of the meerkat population. Since they eat plants and other living bugs that usually hang out in plant-abundant areas, their [meerkats] survival depends on the range of plants near them.
Magnifying Living Things
a leaf,tree bark,skin,flower.hair strand,grass
Did you observe any other characteristics of life in your samples?
For each of your samples, research how the structures you observed under magnification help the organisms carry out basic functions of life.
The characteristics of life observed in the samples was the presence of different types of cells.
What is Magnification?This is defined as the process of enlarging the apparent size of an object through objects such as a microscope.
The structures observed under magnification of leaves include the epidermal cells which help the organisms carry out gaseous exchange.
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What do we call the part of a leaf that
protects the leaf opening called the
stomata?
A. guard cell
B. stem
C. vein
D. blade
Answer:
A.
Explanation:
it should be the guard cell. It is this because, the guard cell is supposed to almost close or move in and out depending on the type of weather or climate.
In the cells of most organisms, DNA is contained in the
a
cell wall
b
nucleus
c
ribosomes
d
lysosomes
Answer:
B. Nucleus
Explanation:
DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA). Mitochondria are structures within cells that convert the energy from food into a form that cells can use.
The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people
The capsid of the virus is made up of
Answer:
The capsid surrounds the virus and is composed of a finite number of protein subunits known as capsomeres, which usually associate with, or are found close to, the virion nucleic acid. I hope this helps and god bless
Explanation:
How were scientists able to identify what gene was mutated when they studied families in Finland?
The scientists employed the use of X-exome sequencing to identify rare gene mutations in the families.
What is X-exome sequencing?This involves the process of genes on chromosome X being identified through positional cloning and used ib various studies.
This was used to identify rare gene mutations in the families in Finland thereby making it the most appropriate choice.
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Humans are dependent on a functioning biosphere and other ecological systems for survival. please select the best answer from the choices provided t f
The statement 'Humans are dependent on a functioning biosphere and other ecological systems for survival' is TRUE.
What are ecological systems?The expression ecological systems make reference to the different levels of organization of the ecosystems.
These systems (ecological systems) are found in a delicate equilibrium in nature.In conclusion, the statement 'Humans are dependent on a functioning biosphere and other ecological systems for survival' is TRUE.
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In general, what happens to the hormone levels between days 21-27 just prior to menstruation if the egg was not fertilized
If the egg has not been fertilized, the increase in progesterone and decrease in estrogen, forcing the egg to be expelled.
What hormones change during menstruation?It is known that in the premenstrual period there is a drop in serotonin levels. The second important factor to cause PMS is the hormonal change that occurs in the second half of the menstrual cycle, with an increase in progesterone and a decrease in estrogen.
With this information, we can conclude that if the egg has not been fertilized, the increase in progesterone and decrease in estrogen, forcing the egg to be expelled.
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Natural capital includes all of Earth's resources and processes that benefit
humans and other living things. What trend is occurring with Earth's natural
capital?
O A. Earth's natural capital is increasing rapidly as the human
population increases.
B. Ecosystems are replenishing natural capital faster than humans
are using it up.
O C. Humans are using up natural capital faster than it is being
replenished.
O D. Sustainable development is greatly reducing Earth's natural
capital.
Answer:C
Explanation:
just took
2. Check THREE that apply.
What are some differences between plant and animal cells?
Plant cells have chloroplasts.
Plant cells have a stiff cell wall.
Plant cells have a cell membrane.
Plant cells have vacuoles.
Plant cells have chorophyll.
