A physical model is often used to show the complex structures that exist in many cells. The sentence that best describes a benefit of using a model of a cell is: (d) It shows details about a system too small to be easily studied.
A physical model is the inanimate representation of the living structures that can be seen and touched. It is used to describe the structural details. The model can be moving or still.
Cell is the most basic and smallest unit of life. It is the building block of all the organisms. A cell is covered on the outside by the plasma membrane and on the inside are present the cytoplasm, various cell organelles and other particles.
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Dead cells with narrow lumen, lignified cell wall with a few or
numerous pits and serving a mechanical function only are called -
Collenchyma
O
Xylem
O
Aerenchyma
O
Sclerenchyma
Answer:
The correct answer is - Sclerenchyma
Explanation:
Sclerenchyma are the dead cells with narrow lumen lignified cells. These dead cells has numerous pits that helps in trading the various substances to neighboring cells. At matuarity, hese cell lack the protoplast so therefore called dead cells .
Sclerenchyma cells are lignified which makes them thick and these cells help in the supporting the plants. These cells are impereable to almost everything gases, substances and many more.
During G2 the Wee1 protein phosphorylates tyrosine-15 of the Cdc2 protein kinase, thus inactivating it. Only once dephosphorylation occurs and Cdc2 becomes active carn the cell pass from G2 into M and proceed to cell division. Can you think of a reason why the Wee1 protein was named as such?
Answer:
cells can't fully grow in Wee1 mutants
Explanation:
The G2 phase is a period where cell growth and proteins are synthesized to prepare for cell division. The Wee1 protein is a dosage-dependent inhibitor of mitosis. Moreover, the cyclin-dependent kinase 2 (cdc2) is a protein involved in the regulation of the cell cycle which phosphorylates serine residues in Wee1. However, in Wee1 mutants, Cdc2 is not inactivated (phosphorylated). This change causes cells to enter M phase prematurely, thereby producing "wee" mutant cells.
If a eukaryotic cell has 20 chromosomes and it undergoes meiosis, how many cells will result, and how many chromosomes will they contain?
A. 4 diploid cells, each with 20 chromosomes
B. haploid cells, each with 10 chromosomes
C. haploid cells, each with 10 chromosomes
D. diploid cells, each with 20 chromosomes
Answer: 2 haploid cells, 10 chromosomes each.
Explanation: meiosis produces haploid gametes from the parent cell.
what frog system is the most differnt from the human system
PLEASE HELP MARKING PEOPLE AS BRAINLIST ALL DAY
19. Which answer is FALSE ? Glucose...
A. breaks down molecules in our body.
B. is a carbohydrate .
C. is the basic energy unit for all cells.
D. is a monosaccharide.
Answer:
A. breaks down molecules in our body.
Explanation:
Glucose is the main type of sugar in the blood and is the major source of energy for the body's cells. Glucose comes from the foods we eat or the body can make it from other substances. Glucose is carried to the cells through the bloodstream. Several hormones, including insulin, control glucose levels in the blood.
Hope this helps :)
Answer:
A is the answer
Explanation:
i just did my test so I hope this helps
Considering the drifting of continents, how do you explain the abundance of marsupials and the absence of native placental mammals in Australia
Answer:
this phenomenon is a natural consequence of evolutionary processes and continental drift
Explanation:
Marsupials are mammals in which newborn offspring are carried in a pouch of the female (mother) body. On the other hand, placentals are mammals that complete embryo development in the mother's body, in the placenta. All the extant marsupials are endemic to Australia and the Americas. It has been shown that marsupials diverged (evolved) in South America, Australia and Antarctica when these landmasses were joined. In Australia, marsupials evolved to fit an ecological niche, which can be attributed to geographic isolation due to continental drift, while placental mammals are relatively recent and more scarce (mainly bats and rodents) within this region.
Please help :) What are some tasks that organelles perform inside of a cell?
Answer: These organelles work together to perform various cellular jobs, including the task of producing, packaging, and exporting certain cellular products. The organelles of the endomembrane system include the endoplasmic reticulum, Golgi apparatus, and vesicles.
Explanation:
I hope this helps
For a transverse wave, the _________ depends on the distance from the rest position to a crest or trough. *
Answer:
[tex]\huge\boxed{\sf Amplitude}[/tex]
Explanation:
❀❀❀ For a transverse wave, the Amplitude depends on the distance from the rest position to a crest or trough. Amplitude = "distance moved by a point on a vibrating body or wave measured from its equilibrium position." Below are some pictures that might be able help you!... (pictures attached) ❀❀❀
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how is the DNA in your skin cells related to the DNA in your heart, liver, and lung cells?
Answer:
With few exceptions, all cells in a person’s body have the same DNA and genes. As cells divide and grow different genes are expressed, resulting in different cell types. As cells divide and grow different genes are expressed, resulting in different cell types.
Explanation:
The enzyme present in saliva
Answer:
Amylase
Explanation:
Saliva contains special enzymes that help digest the starches in your food. An enzyme called amylase breaks down starches (complex carbohydrates) into sugars, which your body can more easily absorb. Saliva also contains an enzyme called lingual lipase, which breaks down fats.
What are nucleic acids used for in the body
Calculate the amount of energy you would expect to find at the secondary consumer level if there were 100,000 J of energy at the producer level in an ecosystem.
The amount of energy one would expect to find at the secondary consumer level if there were 100,000 J of energy at the producer level in an ecosystem is 1000J.
How to calculate amount of energy available in food chain?The food chain is a feeding relationship between living organisms in an ecosystem. Each organism occupies a position called trophic level.
The trophic levels involved in a food chain are as follows:
ProducerPrimary consumersSecondary consumersTertiary consumerThe producer begins the energy transfer, however, only 10% of the available energy is passed to the next trophic level because 90% of this energy is used for metabolic activities.
This means that if 100,000 J of energy is available at the producer level in an ecosystem, the following applies:
Primary consumers: 10/100 × 100,000 = 10000J of energy Secondary consumers: 10/100 × 10,000 = 1000J of energyTherefore, the amount of energy one would expect to find at the secondary consumer level if there were 100,000 J of energy at the producer level in an ecosystem is 1000J.
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Teisha Brown
Bio Trad Bench 1 Clarksdale MS 2020-2021
Section 1
18 of 3018 of 30 Items
Item 18
A cell removes a toxin it has produced through a chemical reaction. Which characteristic of living things is the cell demonstrating?
Answer:
30 items
Explanation:
Which processes change magma into igneous rock?
Answer:
Magma rises to Earth's surface, such as through a volcanic eruption, where it cools and hardens into igneous rock. On the surface, weathering and erosion break down the igneous rock into pebbles, sand, and mud, creating sediment, which accumulates in basins on the Earth's surface.
Explanation:
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As glaciers are receding, what is happening to the crust?
Answer: The enormous weight of this ice caused the surface of the Earth's crust to deform and warp downward, forcing the viscoelastic mantle material to flow away from the loaded region.
Explanation:
Answer:
Its is rising :)
Explanation:
When do land breezes develop? Which way does wind move during a land breeze?
Answer:
A low-pressure zone forms above the land surface from the rapid loss of heat. A high-pressure zone forms as the cooler land cools the air immediately above the surface. Winds aloft flow from the ocean to the land. Winds at the surface flow from high to low pressure, creating a land breeze
Explanation:
What type of biomolecule is used to convert energy to ATP?(1 point)
lipid
carbohydrate
nucleic acid
protein
Answer:
nucleic acid
I hope it is helpful to you
What are the 3 main products from the lights reactions of photosynthesis?
a.NADPH, ATP, CO2
b. ATP, O2, H2O
c.NADPH, O2, H2O
d. ATP, NADPH, O2
What characteristics make a species vulnerable to extinction?
Answer:
Many rare and/or endemic species exhibit one or more of the following attributes which make them especially prone to extinction: (1) narrow (and single) geographical range, (2) only one or a few populations, (3) small population size and little genetic variability, (4) over-exploitation by people
PLEASE HELP I NEED THIS ASAP I NEED TO KNOW WHERE TO PUT EACH BLOCK
The human eye has three types of cone cells. Damage to any of the three cone cells doesn't cause total blindness because of the
the s cone because the human eye needs the s cone and its most important
The bacterial RecA protein (and its counterpart in eukaryotes, Rad51) are involved in, and help direct: ________.
a. chromatin packing and heterochromatin formation
b. Apurinic site repair
c. Post-transcriptional regulation
d. Strand invasion
Answer:
The appropriate alternative is Option b (Apurinic site repair).
Explanation:
Although these antibodies eliminate compromised DNA bases through midriff of N-glycosylic attachments, maintaining perhaps an apurine or perhaps even apyrimidine site today.RecA connects towards DNA damage as well as precipitates recombinant restoration through doulas branch fracture pairing or daughter strand difference restore.Other solutions aren't relevant to the situation in question. So that the answer above is the right one.
Helpp
please dont copy and paste when googling
easy^ points
Answer:
Thalidomide was known as a sedative drug which mothers took during the early stages of pregnancy in order to treat morning sickness. It resulted and caused certain medical effects like congenital malformation which affected the limbs of children.
Explanation:
This is the correct answer.
Thalidomide is a sedative drug which was actually discovered towards the end of the 50s. It was reported that the drug caused tragedy worldwide. In the early 1960s, the drug was withdrawn from use. But it is now being prescribed. Actually, it is used to treat cancers, certain skin conditions, etc.
how does cystic fibrosis increase the risk of respiratory infections such as bronchitis and pneumonia?
a.by causing mucus to build up in airways.
b.by destroying cells of the immune system.
c.by reducing blood flow to the lungs.
d.by increasing air flow to the lungs.
Answer:
CFTR controls the flow of water and salt in and out of the body's cells. Changes cause mucus to become thickened and sticky. This first affects the small airways in the lungs. Over time, it can affect all airways.
Explanation:
Brainliest please?
You are testing for nitrate reduction. The first test, which involves adding Trommsdorff reagent and dilute H2SO4, produces a blue color. Is the test positive or negative for nitrate reduction?
a. positive
b. negative
Answer:
The correct answer is - option a. positive.
Explanation:
Nittarte reduction is the test for the determinantion of the production of nitrate reductase enzyme through various test. One of the test is trommsdroff test.
This test involves trommsdroff reagent and dilute sulfuric acid that produce blue color if the reduction occurs and reductase present. This color is formed due to the conversion of ammonia to nitrate.
The correct answer is - option a. positive.
Why are bacterial cells often used as a host for genetic manipulation?
Answer:
Explanation:
because bacteria reproduce and make proteins very quickly , because the plasmids in bacteria also contain nucleotide sequences called restriction sites that can be cut easily by enzyme.
After Earth formed, its surface cooled and solidified. Volcanoes began spewing gas into the atmosphere. Which two gases made up most of Earth's atmosphere during this period?
Answer:
Ammonia and Carbon Dioxide
Explanation:
It is Ammonia and Carbon dioxide, stage 2 of the atmosphere. Little or no traces of oxygen or Nitrogen.
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which beat descrides the scientits who contributed to our current body of knowledge
Well, this question comes in options and I'll be mentioning them below:
The complete question:
Which best describes the scientists who contributed to our current body of knowledge:
A. Almost all males
B. People of all races and genders
C. Almost all Europeans
D. Currently only South Asians
The correct option is B. This statement best describes the scientists who have contributed to our current body of knowledge. It is something to take pride in and it creates a sense of equality in our minds. It is great that we are being judged on the basis of our knowledge, accomplishments and hard work. To sum it up, any scientist with a curious mind, creative outlook, and persistent attitude can contribute to our current body of knowledge.
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PLEASE HELP IN ONE MINUTE
Answer:
3 is my best guess but be warry
Explanation:
Answer:
3
Explanation:
metals are shiny, malleable, and are really good conductors.
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Nathan mixed salt and pepper in a dish. He held a charged balloon over the mixture and noticed it only attracted the pepper. Why did the charged balloon only attract the pepper?
A) The salt was oppositely charged.
B) The salt was uncharged.
C) The pepper was uncharged.
D) The pepper was charged.
Answer:
B
Explanation:
Answer:
the pepper was uncharged
Explanation: