In what way do the membranes of a eukaryotic cell vary?in what way do the membranes of a eukaryotic cell vary? certain proteins are unique to each membrane. only certain membranes are constructed from amphipathic molecules. only certain membranes of the cell are selectively permeable. some membranes have hydrophobic surfaces exposed to the cytoplasm, whileothers have hydrophilic surfaces facing the cytoplasm. phospholipids are found only in certain membranes.
The membranes of a eukaryotic cell vary certain proteins are unique to each membrane. Option A is correct.
Eukaryotic cells share a plasma membrane structure with prokaryotes. The eukaryotic cell plasma membrane is composed of a phosphate bilayer with embedded protein that separates the cell’s internal contents from its environment.
In both prokaryotic and eukaryotic cells, the plasma membrane is composed of a double layer made up of lipids. The double layer is mainly made up of phospholipid lipids.
The plasma membrane acts as a barrier between the outermost compartment of the cell and the inner compartment of the cell.
The plasma membrane is a selectively permeable membrane that allows the transport of only specific molecules into and out of a cell.
Therefore the correct option is option A.
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Which process involves the movement of molecules or atoms down a concentration gradient across plasma membranes?
Answer:
Diffusion is the process involves the movement of molecules or atoms down a concentration gradient across plasma membranes. It does not require any use of energy so it is a type of passive transport.
Diffusion can be divided into simple diffusion and facilitated diffusion. In simple diffusion, a molecule dissolve with the plasma membrane and transported inside the cell along the concentration gradient.
Facilitate diffusion also involved in transport of molecules along the concentration gradient but in this case, the molecules are transported by carrier protein present in the plasma membrane. Facilitated diffusion has a fast rate of transport than simple diffusion.
You observe large ( >10 micrometer) oval cells in a sputum sample from a patient. your culture of the sample reveals fuzzy filamentous colonies. you conclude that __________. you contaminated the sample the patient has an infection caused by a dimorphic fungus the patient has an infection with unusual algae the patient has a yeast infection the patient has a protozoan infection
Predators, competitors, and diseases are all examples of _____ factors.
The action potential propagates along the sarcolemma. as the action potential spreads down the t tubules of the triads, voltage-sensitive tubule proteins change shape. how does the shape change of these proteins lead to contraction?
The change in shape of voltage-sensitive tubule proteins initiates an action potential, leading to the entry of sodium ions (Na+) and the release of calcium ions (Ca²+) from the sarcoplasmic reticulum. These calcium ions bind to troponin, changing its configuration, and thereby revealing the binding sites for myosin on the actin filaments. This initiates the muscle contraction process.
Explanation:The process leading to muscle contraction begins when the neurotransmitter, Acetylcholine, triggers an action potential within the sarcolemma. This action potential travels down the T Tubule, causing voltage-sensitive tubule proteins to change shape.
As the action potential reaches the membranes within the T Tubule, voltage-gated sodium channels open. This change leads to the depolarization of the membrane as sodium ions (Na+) enter the muscle fiber. This initiates excitation-contraction coupling, and the action potential spreads across the entire muscle fiber's membrane.
The change in voltage stimulates the release of calcium ions (Ca²+) from the sarcoplasmic reticulum, a calcium storage site within the cell. The calcium then binds to troponin, which alters its confirmation and moves tropomyosin off the active sites of actin, allowing the myosin heads to attach, leading to muscle contraction.
The contraction will continue as long as ATP is available to fuel the process, and calcium ions are present in the sarcoplasm.
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The _____ , first proposed by ronald melzack and patrick wall, is a current explanation for how pain works
For each of the traits described below, indicate if it is true only in archaea, only in bacteria, in both archaea and bacteria or in neither group.
1) The cells do not contain ribosomes. - both archaea and bacteria
2) Most of the microorganisms in the group have a cell wall. - both archaea and bacteria
3) When proteins are being made, the first amino acid is a methionine. -
only in archaea (in bacteria is a derivate of it N-formylmethionine)4) They have mitochondria. - in neither group
5) The fatty acids found in the cytoplasmic membrane have branching chains. only in archaea (fatty acids in bacteria have straight chains)
The environment contains
How should you test a hypothesis
If no oxygen is available to a cell, then the net atp production resulting from the metabolism of a single glucose molecule is
Which of these actions causes a physical change?
a.burning a log
b.cooking an egg
c.rusting of a metal pipe
d.crushing an aluminum can?
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The nurse suspects acute respiratory distress syndrome (ards) in a patient who has arterial oxygen tension (pao 2) of 60 mmhg while receiving inspired oxygen (fio 2) of 80 percent oxygen as room air. what is the pao 2 to fio 2 ratio of the patient
What determinant of mean arterial pressure would be directly affected by lasix, and would this typically raise or lower mr. underhill's mean arterial pressure?
what is the function of the Endoplasmic Reticulum
why are scientific theories often so powerful?
Cyanobacteria, unusual worm like life-forms and marine organisms did not exist in Precambrian Time. True of False?
Gila Monsters are one of two types of venomous lizards in the world. If you wanted to avoid coming across the Gila Monster when hiking in Arizona you would want to avoid __________ and __________ because Gila Monsters are crepuscular.
Answer:
Squamata
The Gila monster is venomous, although sluggish in nature and therefore not dangerous to humans.
Explanation:
i did the test on edge 2021
Which option is an example of a physical property? 1.Flammability 2.pH 3. toxicity 4.freezing point
Oceanic crust is formed at _________.
convergent plate boundaries
mid-ocean ridges
subduction zones
lithospheric boundry
Answer:
mid-ocean ridges
Explanation:
Which organism develops breathing organs from pharyngeal arches General arches a shark a spider sea stars see seahorse
Answer: Sea Stars
Explanation:
The only haploid cells in an organism are ___
a. muscle cells
b. red blood cells
c. gametes
d. nerve cells
In the context of sensory receptors, the intensity of the stimulus is communicated to the brain by varying the _____ of the action potential sent to the brain.
Final answer:
The intensity of a stimulus is communicated to the brain by varying the frequency or rate of action potential firing; a stronger stimulus produces action potentials more rapidly and activates more receptors.
Explanation:
In the context of sensory receptors, the intensity of the stimulus is communicated to the brain by varying the frequency or rate of action potential firing. This means that an intense stimulus will produce a more rapid train of action potentials compared to a less intense stimulus, which will produce action potentials at a slower rate. In addition to the firing rate, the number of receptors activated also encodes stimulus intensity, where a more intense stimulus activates more receptors.
Since the height of an action potential is constant for a given neuron, it is the speed of the firing rate that conveys the strength of the stimulus to the nervous system. For instance, a bright light will generate more action potentials in rapid succession than a dim light. This is how our sensory system encodes and communicates different intensities of stimuli to the brain for perception and further processing.
Which rem dosage causes symptoms of radiation sickness including nausea, vomiting, fatigue, and a reduction in white cell count?
The rem dosage that most likely cause the following symptoms mentioned above is the rem 120. It is because if this dosage has given to an individual, the person may likely experience side effects of having to feel nauseated, fatigue, vomiting and the white cell count is being reduced.
Why do the blood types of a person providing blood for a transfusion, and the person receiving the blood, have to be of a compatible abo type?
Fat prevents protein from being burned for energy so that protein can do its own important jobs.
Muscle fibers are directly surrounded by which thin layer of connective tissue? muscle fibers are directly surrounded by which thin layer of connective tissue? perimysium tendon endomysium epimysium
Endomysium is the tiny layer of connective tissue that directly surrounds each muscle fiber. It is a sheet of dense irregular connective tissue which draws the entire muscle and defends muscles from abrasion against other muscles and bones. It is also composed of capillaries and nerves.
Answer:
Endomysium
Explanation:
The frontal lobe is ________ to the occipital lobe, whereas the temporal lobe is ________ to the parietal lobe.
Final answer:
The frontal lobe is anterior to the occipital lobe, and the temporal lobe is inferior to the parietal lobe, with each performing distinct functions in cognition and sensory processing.
Explanation:
The frontal lobe is anterior to the occipital lobe, whereas the temporal lobe is inferior to the parietal lobe. When considering the position of the brain's lobes about each other, these directional terms are often used. The frontal lobe is at the front of the brain and is responsible for higher cognitive functions such as thinking, planning, memory, and judgment. The occipital lobe, located at the back of the brain, is primarily responsible for vision. The parietal lobe is situated above the temporal lobe and is concerned with processing sensory information such as bodily sensations and touch, while the temporal lobe is located beneath the parietal lobe and is key for auditory information and language processing.
If a scientist discovered a sequence of DNA that links the manatee a marine animal to there land dwelling ancestors which explains the likely effect of this discovery on the theory of evolution
What single factor plays the largest role in maintaining adequate bone strength?
Compare and contrast the advantages and disadvantages of sexual and asexual reproduction
Final answer:
Asexual reproduction allows for rapid and mate-free offspring production, advantageous in stable environments but less so in changing ones due to lack of genetic diversity. Sexual reproduction is slower and requires a mate, yet it offers genetic diversity, which aids survival and adaptation in unpredictable environments.
Explanation:
Advantages and Disadvantages of Sexual and Asexual Reproduction
Animals produce offspring through sexual and asexual reproduction, and both methods come with their own sets of pros and cons. Asexual reproduction results in offspring that are genetic clones of the parent, which means they are well-suited for stable environments but potentially at risk in changing conditions due to the lack of genetic diversity. Sexual reproduction, while more energy-intensive as it requires finding a mate, generates offspring with genetic variation, which can be a significant advantage in unpredictable environments.
The main advantages of asexual reproduction are the ability to quickly produce large numbers of offspring without the need for a mate, which is beneficial for colonization of new habitats and rapid population growth. However, the disadvantage is that offspring lack genetic diversity, making them more vulnerable to environmental changes and diseases. On the flip side, the advantages of sexual reproduction include the production of genetically diverse offspring, which allows for better survival through changing conditions and potential adaptation to new environments.
A rapid evolutionary advantage of sexual reproduction is the enhanced potential for adaptation due to genetic recombination, which asexually reproducing species might lack. However, asexual reproduction can still be advantageous in certain environments and life strategies, illustrating the complexity of these reproductive strategies in the natural world.