The prokaryotic cell cycle is different from the eukaryotic cell cycle because in the prokaryotic cell cycle cell division does not involve the division of the cell nucleus.
What do you mean by Cell cycle?The cell cycle may be defined as the process a cell goes through each time it divides. The cell cycle consists of a series of steps during which the chromosomes and other cell material double to make two copies.
Prokaryotic cell lacks a nucleus and well-defined cell organelles. Due to the deficient nucleus, a prokaryotic cell never involves the nucleus in its division.
Therefore, the prokaryotic cell cycle is different from the eukaryotic cell cycle because in the prokaryotic cell cycle cell division does not involve the division of the cell nucleus.
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Which of the following are always larger than the neutral atoms from which they are formed?
A. positive ions
B. negative ions
C. cations
D. none of the above
Negative ions, or anions, are always larger than the neutral atoms from which they are formed because they gain one or more electrons and their electron cloud expands.
Explanation:The question asks which of the following are always larger than the neutral atoms from which they are formed? The options given are: A. positive ions, B. negative ions, C. cations, and D. none of the above.
When a neutral atom gains one or more electrons, it forms a negative ion or anion, which is always larger than the parent atom. Conversely, when a neutral atom loses one or more electrons, it becomes a positive ion or cation, which is always smaller than the parent atom. Therefore, the correct answer to this question is B. negative ions, as they are the ones that are always larger than the neutral atoms from which they are formed.
Which phase occurs directly after S phase?
A. Cytokinesis
B. G2
C. G1
D. M phase
Answer:
The correct answer is B. G2
Explanation:
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Geologists frequently look at the relationships among rock layers. Which statement best describes the information geologists get from studying these relationships?
Which of the primary tissue types detects and responds to changes in the environment in order to maintain homeostasis?
A) dense irregular
B) connective
C) epithelial
D) muscular
E) nervous
70 pts The human body is composed of several organ systems. One organ, the brain, controls the functioning of all other organs and organ systems. This organ is part of the ___________ system.
A) circulatory
B) muscular
C) nervous
D) respiratory
Why do populations of organisms fluctuate?
The city wants to drain a large lake to use the land for a new courthouse adjacent to county offices. What environmental factors need to be investigated before draining the lake? ...?
As resources in a population become less available population growth will
Answer:
As resources in a population become less available population growth will decline. An ecosystem can support the growth of a population up to a certain number which is called the carrying capacity of the ecosystem.
Once the carrying capacity is reached in an ecosystem the growth of the population will stop and there will not be any increase in the number of individuals due to limitation of the resource for growth.
So if the resource in the population becomes less available then it can not support the high growth of a population because it decreases its carrying capacity and ultimately decrease the population growth.
A plant grows faster and fuller due to large amounts of fertilizer. If the plant cross-pollinates with another plant later, how will the use of fertilizer on the parent plant affect the plant’s offspring?
Answer:
The height of the offspring will not change
Explanation:
The largest of the salivary glands is the
a. submandibular.
b. minor.
c. parotid.
d. sublingual.
In looking at the layer of rock, bones from the Pliohippus are found in layers above bones of the Mesohippus what does this tell you about the age of these bones
A.)The Mesohippus is older than the Pliohippus
Answer:
The bones of Mesohippus is older than Pliohippus
Explanation:
Pliohippis and Mesohippus are both an extinct genus that occurred in the evolutionary path of the horse. Pliohippus occurred about 15-20 million years back during the middle Miocene period, whereas Mesohippus occurred about 30-40 million years back ranging in age from the Middle of Eocene period to the Early Oligocene period.
This means that the Mesohippus occurred first, and it has undergone evolution, creating the Pliohippus.
Thus, it can be concluded that the bones of Mesohippus after their death are deposited in the rock layers and above this layer, the following rock layer contains the bones of Pliohippus. So the rocks containing Mesohippus are older than the rocks containing Pliohippus.
Hence, the bones of Mesohippus is older than Pliohippus.
Which is not true of laterite soils?
a. they form in the wet tropicsb. they are red in colorc. they are very productive agriculturallyd. they are enriched in iron oxide
Answer: c. they are very productive agriculturally
Explanation:
The laterite soil is reddish to yellow in color. It is typically found in hot and wet tropical areas. The soil exhibit a lower concentration of nitrogen, potassium, lime, phosphorus and magnesia. But soil contains high concentration of oxides of iron, manganese and titanium. It is not suitable for agriculture as the soil lacks essential elements required for the growth of crops like nitrogen, potassium and phosphorus. The soil is suitable for making bricks.
On the basis of the above explanation, c. they are very productive agriculturally is not true for laterite soils.
In a genetic cross between two flowering plants that are heterozygous for the color trait, red flowers (R) are dominant to white flowers (r). What fraction of the offspring should have red flowers?
Three–fourths of the offspring should have red flowers.
One–half of the offspring should have red flowers.
One–fourth of the offspring should have red flowers.
Answer:
A. Three–fourths of the offspring should have red flowers
Explanation:
Describe the flow of energy from the sun to the "reaction center":
Final answer:
The flow of energy from the sun to the reaction center in photosynthesis involves multiple steps, including pigment absorption, energy transfer, and electron transport.
Explanation:
The flow of energy from the sun to the reaction center in photosynthesis involves multiple steps.
The pigments in the light-dependent reactions, such as photosystem II, absorb energy from sunlight.The absorbed energy is transferred from chlorophyll to chlorophyll until it reaches the reaction center.The energy at the reaction center is used to initiate electron transport and the production of ATP and NADPH.This flow of energy enables the conversion of sunlight into chemical energy that can be used by the plant for various processes.
What is the term used for inserting a healthy copy of a gene into a person who has a defective gene?
food, water, and wastes are stored inside _______
Vacuole is a membranous organelle present in the eukaryotic cell. Food water and wastes are stored in vacuoles.
A vacuole is a region of cytoplasm-free, membrane-lined, and liquid-filled space inside a cell. A vacuole is a membrane-bound structure that exists in a cell's cytoplasmic matrix. Tonoplast is the membrane encircling the vacuole. The vacuole's components, known as cell sap, differ from the surrounding cytoplasm
Phospholipids constitute the membranes. Proteins embedded in membranes aid in molecule transport across the membrane. Different protein combinations assist the vacuoles retain various things. Plants, fungi, algae, and certain other species also store potent secondary compounds in their vacuoles to shield the cell from self-toxicity, such as tannins or other biological colors.
Therefore, a vacuole is the organelle concerned with storing food, water and wastes.
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Glyolysis – takes one _______ molecule and converts it two two _________________ molecules.
Aerobic respiration uses _______gas and happens in what two processes (after glycolysis)
The temperature of the stratosphere increases with height.
True
False
Why is it important for your heart to keep oxygen rich blood separate from oxygen poor blood?
Separation of oxygenated and deoxygenated blood in the heart is critical for efficient circulation of oxygen and carbon dioxide. The heart's four chambers, coronary circuit, and rhythmic beating pattern (cardiac cycle) allow for this essential process to occur continually, providing the body with life-supporting substances.
Explanation:Keeping oxygen rich (oxygenated) blood separate from oxygen poor (deoxygenated) blood in the heart is crucial for the efficient movement of oxygen and carbon dioxide around the body, enabling us to maintain our bodily functions and, importantly, enabling us to move quickly when needed. This division and specialization of functions is achieved via our four-chambered heart. The right side of the heart pumps deoxygenated blood towards the lungs in the pulmonary circuit, where it becomes oxygenated again. On the other side, the left side of the heart drives the oxygenated blood to the rest of the body via the systemic circuit.
The heart itself is a highly active organ and has its own unique blood supply, the coronary circulation, ensuring steady supply of oxygen and nutrients and waste removal even when the heart is contracting. Blockage of these coronary arteries can lead to serious health problems, including heart attacks.
In order to ensure this continual circulation, our heart follows a regulated beating pattern known as the cardiac cycle. This cycle encompasses the process of filling the heart with blood and pushing it out, controlled via electrical signals promoting heart muscle contraction and relaxation. This system allows the heart to beat over 100,000 times a day, providing the essential movement of critical life-supporting substances around our body.
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Does mutations occur in both dna and rna
describe the causes of coral reef habitation destruction
Final answer:
Coral reef destruction is primarily caused by climate change-induced global warming and human activities, leading to bleaching and habitat degradation. Ocean acidification, pollution, and overfishing exacerbate these issues, significantly harming coral ecosystems and biodiversity, as well as impacting coastal economies.
Explanation:
The causes of coral reef habitat destruction are multifaceted, with both climate change and human activity playing significant roles. The primary cause of coral damage is the increase in water temperatures resulting from global warming. This heightened temperature forces the corals to expel their symbiotic algae, leading to bleaching. Besides, human population growth leads to increased runoff of sediment and agricultural chemicals, which clouds the water and disrupts coral ecosystems. Overfishing compounds the issue by eliminating fish species that help control the predator species consuming corals.
Additionally, the rising levels of CO₂ in the atmosphere, which result in ocean acidification, impede the calcification process that is critical for corals to maintain their hard calcium carbonate skeletons. Without this structure, corals and their dependent species decline in numbers. Not to dismiss other contributing factors such as poor fire management, pollution, mining, and storm damage, which together with overfishing can bring about irreversible changes to coral habitats and the broader ecosystem.
Bile
has no effect on digestion.
helps in the digestion of fats.
helps in the digestion of carbohydrates.
helps in the digestion of proteins.
helps in the digestion of both proteins and carbohydrates.
...?
In which of the following ways is DNA replication different from DNA transcription?
New cells can only be created after transcription has taken place.
Replication results in mRNA strands while transcription creates new DNA.
Transcription happens outside the nucleus and replication happens inside the nucleus.
Thymine is used in replication while uracil is used in transcription.
I don't know if this is C or D.
What is the primary function of nucleic acids?
plant cells make their own food by taking in
There are twenty different types of _____________ which join together in differing sequences and numbers to form different proteins.
Thew correct answer is amino-acids
Amino acids are essential to all life on earth. They are organic molecules comprised out of the amino (NH2) and acidic ( COOH) compound. The twenty amino acids can bound to one another with peptide bonds and form different complex structures called proteins. Proteins are important structural part of cells, enzymes and hormones, and without them the life as we know couldn't exist.
Describe and explain the changes in electrical activity both in receptor and in the sensory neurone as increasing pressure is applied to the Pacinian corpuscle?
Increasing pressure on a Pacinian corpuscle opens gated ion channels, causing a receptor potential in the sensory neuron. This graded potential can lead to an action potential if the threshold is reached, which is then transmitted to the central nervous system.
Explanation:Understanding Pacinian Corpuscles and Nervous System Response
When increasing pressure is applied to the Pacinian corpuscle, a mechanoreceptor deep in the skin, changes occur in electrical activity within the receptor and the sensory neuron. Initially, the pressure deforms the corpuscle, causing mechanical pressure on the sensory neuron's dendrite. This mechanical stress opens gated ion channels, resulting in an influx of positive ions like sodium (Na+) into the neuron, thus changing the electrical potential of the neuron.
This alteration in electrical potential is known as a receptor potential, and it is a graded potential, meaning that its magnitude varies directly with the strength of the stimulus. With strong enough pressure, if the receptor potential reaches a certain threshold, this depolarization leads to the generation of an action potential. This action potential propagates along the sensory neuron, sending signals to the central nervous system that pressure has been applied.
Myelin sheaths around neurons facilitate the rapid conduction of these signals, ensuring effective response to the mechanical stimulus. This biological mechanism allows us to perceive variations in touch, pressure, and vibration through our sensory system.
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What happens when sunlight Strikes chlorophyll?
URGENT!!!!!!!!!!!!!!!!!!!!!!!!!
Adaptation is possible due to the known mechanism of:
genetic recombination
evolution
mitosis
SOS:
The answer is genetic recombination!
Hope this helps!
Answer:genetic recombination
Explanation:
Explain how agriculture affects coral reefs.
Answer:
It is estimated that 25% of coral reefs are threatened by pollutants from agriculture. Unsustainable and intensive agriculture transmits sediment, inorganic and organic nutrients and chemical contaminants to waterways, aquifers and the ocean.
Explanation:
Coral reefs are the exoskeletons that are present in the oceanic ecosystem. The fertilizers and pesticide run-offs from the agricultural field lead to acidification and bleaching.
What are acidification and bleaching?The increased concentration of carbon dioxide in oceanic water causes a decrease in the pH of the water and hence results in acidification and bleaching.
The pesticides and fertilizers used in agricultural fields run off the soil surface by the rain and reach the oceans and destructs the corals due to inorganic and organic chemicals.
These chemicals alter and harm the structural composition of the coral reefs and also the organisms living in them by increasing the acidic concentration.
Therefore, the agricultural run-off containing pesticides and fertilizers affects the reefs.
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