Which statement is true about the rates of cell division in eukaryotes?
A. They remain the same for the life of the organism
B. They are faster than that of prokaryotes
C. They increase with the age of the organism
D. They vary greatly within an organism
Eukaryotic cells multiply at varied speeds. Yeast cells divide and double in 2 hours, but plant and mammal cells take 10–20 hours. Therefore, option (D) is correct.
Why do prokaryotic cells divide faster than eukaryotic cells?Prokaryotic cell division, also known as binary fission, is a simpler and more rapid process than eukaryotic cell division. Bacterial populations can expand quite quickly due of how quickly their cells divide. Prokaryotic cells can replicate more quickly than eukaryotic cells because they typically only contain one circular chromosome. A prokaryotic cell can really go through two cycles of DNA replication before the cell divides.
Eukaryotic cells multiply and develop at remarkably varied speeds. While the majority of plant and animal cells take between 10 and 20 hours to divide and multiply, yeast cells may do so in just 2 hours.
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The single most important limiting factor in any terrestrial biome is
The right answer is available water.
The biome is an ecological unit of very large extent, covering a fraction of one or more continents and characterized by a set of plant and animal species that are specific to it.
The tropical rain forest, the temperate forest, the boreal forest, the grassland, the savannah, the scrub, the desert and the tundra are biomes. Most often, biomes refer to a terrestrial community, but aquatic communities can also be classified as biomes. Marine biomes include coral reefs and deep seabed. Freshwater biomes include lakes, ponds and streams. Their presence or absence indicates the presence of water (or not) in the vicinity of the terrestrial biome.
A camel's hump is an example of what adaptation
melting snow, ponds, and water found in trills are examples of
What is a small, circular piece of bacterial dna found to carry only a few genes?
Why are transport proteins multipass rather than single-pass integral membrane proteins?
Transport proteins are multipass rather than single-pass integral membrane proteins because they have multiple transmembrane domains that allow them to interact with and transport specific substances.
Explanation:The integral proteins involved in facilitated transport are referred to as transport proteins. These proteins are transmembrane proteins that function as either channels or carriers. While channels form a hydrophilic pore through the membrane layers, carriers bind with the substance and aid its diffusion through the membrane. Transport proteins are multipass rather than single-pass integral membrane proteins because they have multiple transmembrane domains that allow them to interact with and transport specific substances.
Transport proteins, which are integral membrane proteins, typically have multiple transmembrane domains that span the lipid bilayer of the cell membrane. These transmembrane domains create a channel or pathway through which specific substances can be transported across the membrane.
Because they have multiple transmembrane domains, transport proteins are referred to as multipass integral membrane proteins. This structural feature allows them to interact with and facilitate the movement of specific substances, such as ions or molecules, across the membrane.
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For water to travel across the cell membrane at a substantial rate, the water molecules travel through protein channels known as aquaporins
Aquaporins, found in the cell membrane, are proteins that enable the rapid transport of water across the cell membrane via facilitated diffusion. Human cells contain various types of aquaporins and any mutations in these genes can lead to specific genetic diseases. This process is essential for maintaining the water balance requirements of a cell.
Explanation:Aquaporins are protein channels present in the cell membrane which permit the passage of water. These proteins have a special hydrophilic channel through their core, thus allowing water molecules to bypass the nonpolar central layer of the cell membrane. The water movement through these channel proteins is a process referred to as facilitated diffusion. This movement happens at a significantly high rate facilitating the cell to meet its water balance requirements. Note, that the size of the aquaporin channels is small enough to only permit water molecules.
There has been an identification of at least 10 types of aquaporins in humans, six of which are known to exist in the kidney. All aquaporins function to enable the transfer of water across the lipid-rich, hydrophobic cell membrane. Consequently, any mutation of the aquaporin genes can result in some specific genetic diseases. It's important to remember that this discovered mechanism of water balance through aquaporins earned Peter Agre a Nobel Prize in Chemistry in 2003.
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The map shows the distribution of wild boars in the United States. Wild boars are an invasive species to the United States. mc024-1.jpg Which of these facts about wild boars is best supported by the evidence provided?
Correct option is C
The wild boar, also known as wild swine. They were bought to united states by their natives. Due to warm the climate of U.S wild boars reproduce quickly there. They also have no natural predators so they invade the U.S quickly so the best option is C.
After suffering a severe brain injury in a dirt-bike accident that permanently damaged much of his right motor cortex, 9-year-old amir was partially paralyzed on the left side of his body. amazingly, after several months of intensive physical therapy, he partially regained the use of his left leg and left arm. this example best illustrates the principle of:
Emotional and psychological violence can cause as much harm as physical blows or injuries.
a. True
b. False
Non-avian reptiles can produce hyperosmotic urine using which structure?
a.salt glands similar to birds
b.the rectum where uric acid is produced
c.water-reabsorbing cloaca
d.water-reabsorbing ureters
e.highly developed kidneys
Answer:
The correct answer is option B, The rectum where uric acid is produced
Explanation:
The hyperosmotic urine of non- avian mammal is produced in the hindgut anterior to the rectum in reptiles while in case of insects it is produced in their extensive rectum. In general, waste product is released from the hemolymph into the gut for expulsion through the Malpighian tubules which are connected to the alimentary tract between the midgut and hindgutf rectum that absorb solutes and water from urine and make it hyperosmotic urine
Non-avian reptiles use their highly developed kidneys to produce hyperosmotic urine, effectively allowing them to conserve water and survive in arid conditions.
Explanation:Non-avian reptiles can produce hyperosmotic urine through their highly developed kidneys. Hyperosmotic urine contains a high concentration of salts and other solutes. In general, reptiles have set up their bodies to conserve as much water as possible because they live in dry and arid areas. Their kidneys play a critical role in this water conservation as they filter the blood, reabsorb water and leave behind a concentrated urine. This is especially crucial because it allows for the excretion of metabolic waste products in a form that minimizes water loss.
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What are groups of tissues working together to perform a specific function?
-cells
-organisms
-organs
-organ systems
Organs. Just took the test
Groups of tissues working together to perform a specific function are called organs.
Explanation:Organs are made up of different types of tissues that work together to perform a specific function in the body. For example, the heart is an organ made up of cardiac muscle tissue, connective tissue, and nerve tissue that work together to pump blood throughout the body. Organ systems, on the other hand, are groups of organs that work together to perform a specific function, such as the digestive system or the respiratory system.
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Which part of the reproductive system and a fluid that provides a source of energy for the active sperm?
Cell division seems to be limited by the length of chromosomal structures called ____________.
The membranes of neurons at rest are very permeable to _____ but only slightly permeable to _____. hints the membranes of neurons at rest are very permeable to _____ but only slightly permeable to _____. na+; cl– k+; na+ k+; cl– na+; k+
Neuronal membranes at rest are highly permeable to potassium ions (K+) and slightly permeable to sodium ions (Na+), which contributes to the neuron's resting membrane potential.
The membranes of neurons at rest are very permeable to potassium (K+), but only slightly permeable to sodium (Na+). In its resting state, a neuron's cell membrane has numerous potassium leak channels that allow for the efflux of K+ ions, contributing to the negative resting membrane potential inside the neuron. On the other hand, the permeability of the neuron's membrane to Na+ is significantly lower; there are very few sodium leak channels, and the Na+ ions that do enter are actively pumped out by the sodium-potassium pump.
In which days of mansturation cycle no egg will be there ?????
Final answer:
The menstrual cycle includes a phase called ovulation, typically around day 14 of a 28-day cycle, when an egg is released and can be fertilized. Outside the context of ovulation and after menopause, no viable eggs are present or released.
Explanation:
The question is addressing the menstrual cycle and the availability of an egg for fertilization. In a typical cycle, ovulation occurs around the midpoint of the cycle, nearly day 14 of a 28-day cycle. However, eggs are not available at all times during the menstrual cycle. During menopause, which usually happens to women in their mid-40s to mid-50s, the ovaries lose their sensitivity to Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). As a result, menstrual periods become less frequent and finally cease, leading to the point where no eggs are matured and released, making natural conception impossible.
Moreover, outside of the reproductive years and outside the ovulatory phase of the menstrual cycle, eggs are not mature or released. During menstrual cycles, an egg, once released during ovulation, is viable for fertilization for only about 12-24 hours. If it is not fertilized within this time frame, it will degenerate and be reabsorbed by the body. If fertilization does not occur, the menstrual cycle progresses to menstruation, and the cycle starts anew without an egg present until the next ovulation.
Which molecules do mammals use to store extra glucose in their muscles?
A.Starch
B.Glycogen
C.Baleen
D.Myosin
its b hope this helps you out bc it did me
Which term do biologists use to describe the average number of individuals of a species per unit area?
Population density is the right term.
Population density of any species (plant, animal or humans) is the number of individuals found in a given unit of area. It is usually expresses as “X” species in “Y”
X = number of species
Y = unit of area , it can be square feet, Square meter, Square kilometer, Square yard etc.
For example , population of 1000 insects living in an area fo 1000 square feet has a population density of 1000/1000 insects per square feet = 1 insect per square feet.
These techniques take advantage of the brain's consumption of glucose or oxygen and specifically look for which part of the brain is most active "during more generalized processing." the active part of the brain would require more resources than inactive areas.
When you hit your elbow and say that you hit your "funny bone," you have actually hit a nerve that runs across the bone surface. over which bone can this nerve be found?
A geologist noted that the sediment in an area differs in composition from the bedrock beneath it. Which statement best explains the geologist's observation? A.Wind, water, and plants can break down bedrock. B.Sediments form from the local bedrock. C.Wind and water can transport sediments to a new location. D.Species in an area change as bedrock becomes soil.
Answer: C.Wind and water can transport sediments to a new location.
According to the given situation, this can be concluded that the composition of the sediments is different from the bedrock beneath it because the sediments are deposited by the physical agents such as water, wind and others undergoing processes like weathering and erosion of the parent material and transporting the materials or sediments to the new locations.
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How are codons like words in an instruction manual?
A. They tell cells the specific sequence of amino acids for making a protein.
B. They are made up of 26 different nucleotides that are like letters of the alphabet.
C. They tell cells the specific sequence of nucleic acids for making a nucleotide.
D. They are made up of 20 different nucleotides that each stand for one kind of amino acid.
They tell cells the specific sequence of amino acids for making a protein.
Upon fertilization, the egg and sperm fuse to form a single cell called a(n) ________.
The release of endotoxins as bacteria are destroyed by phagocytes causes the phagocytes to release tumor necrosis factor (tnf). the life-threatening loss of blood pressure due to the action of tnf is called __________.
Which best describes a centromere
Answer:
c is the best answer home this helps
if it did mark me brainlyist
Explanation:
Which of the following is a good scientific hypothesis? Gasoline is made up of particles that can not be seen. If a plant is given less oxygen than what is present in the air, the plant will grow more slowly. People who smoke cough more often. More people carry laptops at the airport on Tuesdays then on Saturdays.
Answer:
People who smoke cough more often.
Explanation:
The other guy is wrong!
what are the 4 distinct characteristics of the 3 colonial regions?
1) The ocean absorbs more carbon dioxide from the atmosphere than the land.
True
False
if you start with a single bacterium, capable of dividing every 20 minutes, how many bacteria would you have after just 4 hours
Answer:
4096
Explanation:
Multiple 1 (original bacterium) by 2, 12 times
1*2*2*2*2*2*2*2*2*2*2*2*2 = 4096
4096 bacteria would be present after 4 hours as they grow via binary division.
What is bacteria?Bacteria is prokaryotic unicellular microorganism.They are found in extreme harsh conditions.Bacteria has hair like structure that helps in their locomotion.Bacteria grow through binary division.What do you mean by binary division?It is a type of cell division in which one cell give rise to two identical daughter cells.As it is given that bacteria divides at every 20 minutes mean 2 cells are formed from 1 cell. And after 40 min 8 (2∧n) bacterial cells are present.
After 4 hours i.e., 240 min= 240/20=12.
So 2∧12 = 4096 cells are present.
Hence, the answer is 4096 bacterial cells.
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When dietary intake of calcium is low, the body takes calcium from bone. when dietary intake of calcium is low, the body takes calcium from bone.
a. True
b. False?
Calcium salts in bone represent ____ percent of all calcium stored in
the body.