During muscle contraction, the muscle cell membrane becomes temporarily permeable to sodium (Option b is correct).
Muscle cells are excitable, which means that these cells change from a resting state to an excited state in response to stimuli.At resting (non-signaling) state, Na+ ions are found at a higher concentration outside of the muscle cell than inside the cell, whereas potassium (K2+) ions are found at a higher concentration inside the cell than out the cell.When a nerve transmits an excitable signal that a muscle cell, Na+ flows into the muscle cell, and simultaneously potassium (K2+) ions out of the cell.The influx of Na+ ions is caused by the opening of voltage-gated sodium (Nav) channels found in the membrane (sarcolemma) of muscle cells.In conclusion, during muscle contraction, the muscle cell membrane becomes permeable to sodium ions (Option b is correct).
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Which of the following shows the correct progression of organisms on the planet?
a. Reptiles, fish, hominins
b. Fish, reptiles, hominins
c. Prokaryotes, angiosperms, gymnosperms
d. Reptiles, mammals, fish
The correct progression of the organisms listed is : ( B )
Fish, reptiles, hominins ( B )The existence of organisms on the planet started millions of years ago and these organisms gradually progressed from one type to another.
Oldest organismThe first and oldest organisms that existed on earth where the prokaryotes which where in existence around 3800 million years. But following the correct order of progression of organisms as represented in the options is :
Fish Reptiles HomininsThis is because Fish existed about 450 million years before Reptiles which started existing about 315 million years while Hominins also known as Homosapiens where among the last organisms to inhabit the planet through their existence.
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Answer:
the answer is (B) fish, reptiles, and hominins
Explanation:
PLZ HELP ASAP (BRAINLIEST)
The orbital radii of four planets in our solar system is shown in the following table.
Orbital Radii
Planet Orbital Radii (AU)
W 5.2
X 0.72
Y 0.37
Z 19.1
Which planets are likely to be inner planets?
W and X
X and Y
Y and Z
X and Z
Answer:
x and y
Explanation:
x and y have the smallest orbital radius so they are likely to be inner planets while w and z have bigger orbital radius so the probability of them being inner planets is low.
Hope this helps.
Differences in traits such as hair texture are determined by differences in
Answer: genes or genetic traits. These genes determine what physical characteristics a human will possess. They are determined by the parents of an offspring and vary from person to person
Explanation:
What can leaves do that roots cannot?
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
carry out photosynthesis
Answer:
2 carry out photosynthesis
Roots in the ground, it cannot.
use mathematical representation to predict motion of objects in the solar system -
Explanation:
Kepler's laws describe common features of the motions of orbiting objects, including their elliptical paths around the sun. ... Use mathematical and computational representations of Newtonian gravitational laws governing orbital motion that apply to moons and human-made satellites.
Clarification Statement: Emphasis is on Newtonian gravitational laws governing orbital motions, which apply to human-made satellites as well as planets and moons.
Assessment Boundary: Mathematical representations for the gravitational attraction of bodies and Kepler’s Laws of orbital motions should not deal with more than two bodies, nor involve calculus.
please help i am giving away brainiliest
The ______________ system is a collection of glands that produce and secrete hormones.
A. endocine
B. reproductive
C. immune
No dam links
Answer:
A: endocine
Explanation:
Please hurry 100 points
Answer:
I am sorry but I don't have any information on this question.
Answer:
What's the question
Explanation:
what are renewable natural resources?
Explanation:
It's a natural resource which will replenish to replace the portion depleted by usage and consumption.
A population of wolves predates a population of moose on Isle Royale, Michigan, where there are fewer wolves than moose to start. The wolves prey on the moose and eat well, allowing them to have abundant offspring. However, as the wolf population rises, the moose population drops, and over time, the wolf population begins to drop also because of the reduced availability of resources. As the wolf population drops, moose are able to better survive and reproduce, causing the moose population to rise. With this abundance of moose, the wolf population is able to rebound until their population exceeds the moose population’s ability to support the number of wolves. Which population dynamic does this series of oscillations represent?
Complete question:
A population of wolves predates a population of moose on Isle Royale, Michigan, where there are fewer wolves than moose to start. The wolves prey on the moose and eat well, allowing them to have abundant offspring. However, as the wolf population rises, the moose population drops, and over time, the wolf population begins to drop also because of the reduced availability of resources. As the wolf population drops, moose are able to better survive and reproduce, causing the moose population to rise. With this abundance of moose, the wolf population is able to rebound until their population exceeds the moose population’s ability to support the number of wolves. Which population dynamic does this series of oscillations represent?
Delayed density dependence Delayed density independence Extinction vortex Carrying capacityAnswer:
Delayed density dependenceExplanation:
The Delayed density dependence occurs when two species are in interaction (prey-predator or parasite-host), and the dynamic of each population follows the dynamic of the other population. The natality and mortality rates of one species follow the rates of the other species.
Delayed density dependence dynamics regulate populations and allow the occurrence of equilibrium or balance in nature.
Predator-prey scenarios
Assuming that the prey lives in the ideal environment with no predators, it shows an exponential growth rate. Prey can grow, develop, and reproduce, increasing its population size. The more available items, the more predator there will be. The predator population increase in size, and its presence affects the prey populations, leading it to decrease. So there are fewer available items to prey on.
The prey population also affects the predator population. After the increase in the predator population size, the number of available prey decreases. The predator lives in an ideal environment but depends on the prey density. The more predators there are, the fewer prey there will be left. The predator population decreases exponentially due to the item's lack. The predation rate depends on density as well as natality and mortality rates.
So, to sum up,
prey population increases in sizepredator population increases in sizeprey population decreases in sizepredator population decreases in sizeIn this particular example, the wolves population follows the moose population and vice-versa. It is not simultaneous. It happens with a delay.
Moose influences the wolf population because they are their source of food. The more moose, the more wolves there are. The fewer moose, the fewer wolves there are.
This is a density-dependent dynamic because both populations are affected when they reach a high value.
g The primary detrimental effect of the presence of large amounts of biodegradable organic materials in water is ________. The primary detrimental effect of the presence of large amounts of biodegradable organic materials in water is ________. it rises to the surface and absorbs wavelengths needed by aquatic plants it causes the water to become murky it decomposes endothermically causing the temperature of the water to decrease below the limits within which most aquatic organisms can live it causes oxygen depletion in the water it causes death of bottom dwelling organisms because it agglutinates and settles to the bottom, poisoning bottom dwelling organisms
Answer:
It causes oxygen depletion in the water
Explanation:
When the amounts of organic matter in the water are significant, the activity of aerobic bacteria and other decomposers increases.
Organic matter suffers decomposition in the presence of oxygen. Microorganisms degrade it while consuming dissolved oxygen in the process. Bacteria show fast and exponential growth, so the more organic matter, the more aerobic bacteria, and the less available oxygen in the water.
Organisms that usually inhabit these waters are affected by the lack of oxygen. Plants, algae, animals, and other invertebrates that need it to survive, find themselves limited in these environmental conditions. Eventually, they dye and contribute with more organic matter.
Little by little, sedimentation begins caused by the death of vegetables and animals, sinking in the bottom.
When oxygen disappears, anaerobic bacteria grow and act, producing fermentation.
Following proper safety guidelines _______.
a.
minimizes the chance of accidents occurring in lab
b.
involves using a fire extinguisher
c.
prevents accidents from occurring in lab
d.
requires using a safety shower
Please select the best answer from the choices provided
A
B
C
D
Answer:
the answer is either a or c. I don't really recommend c so its A
Answer: a
Explanation: accidents could be minimized by following safe guidelines. But we cant be 100percent preventive, because its an accident.
QUESTION 17
20. Which of the following is not a protein involved in muscle function?
Catt
troponin
myosin
tropomyosin
actin
QUESTION 18
The 4 proteins that are involved in muscle contraction are:
Thick filaments contain myosin, thin filaments contain actin , troponin and tropomyosin.
Hence, the answer is "Catt."
Why is this flower able to self-pollinate?
O A. It has a pistil and anthers.
OB. It has stamens and anthers.
o C. It has a pistil and an ovary.
O D. It has stamens and an ovary
Answer:
Explanation:
Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant.
Please help! Giving brainliest and high points!
Answer: 1. a. Tail Tail, b. Tall short, c. short short, d. purple flower purple flower, e. purple flower white flower, f. white flower, white flower. g. tall tall and purple flower purple flower, h. tall short and white flower white flower, i. short short and purple flower and white flower, j. short short and white flower white flower, k. tall short and purple flower and white flower. 2. a. tall, purple flower, b. tall, short, purple flower and white flower, c. tall short and white flower, d. tall short and purple flower an white flower, 3. a. 4. Tt, b. 3. TT, c. 5. tt, d. 1. T, e. 2. t.
Explanation:
Only a single drop of water is needed to make a smear?
a. True
b. False
Answer:
true,only a single drop of water can cause a smear
Not really a homework question, just curious because I couldn't find an answer on a search engine.
I found a small, 6 legged, black bug in my backyard. In fact, they are everywhere in my yard, it doesn't annoy me whatsoever. It is a harmless bug, as I have interacted with them before. Can anyone tell me what bug it is?
Answer:
palo verde beetle
Explanation:
this was the closest match to the beetles I saw I think it is also called a black carpet beetle.
HELP ASAP HELP.......
Answer:
energy must equal out
Explanation:
obvious
In the diagram below, which flower part will
become a seed?
Structure A
Structure D
Structure B
Structure C
6. Samples of atmospheric air and exhaled air were analysed by four groups
of students for oxygen and carbon (IV) oxide content. The following are
the results, expressed in volumes per thousand:
(i) Amount of oxygen in atmosphere = 200
(ii) Amount of oxygen in exhaled air = 160
(iii) Amount of carbon (IV) oxide in atmosphere = 300
(iv) Amount of carbon (IV) oxide in exhaled air =41
Explain the difference in volume of each gas between the atmosphere and
the exhaled air.
Answer:
Due to difference in volume of both atmosphere.
Explanation:
There is difference in volume of carbondioxide and oxygen gas between the atmosphere and the exhaled air because of the volume difference of atmosphere and exhaled air. The volume of atmosphere is larger than the body from where the gases are exhaled. The body has lower space for these gases so these gases are less in concentration in the exhaled air which the body releases as compared to the atmosphere where the concentration of these gases are larger.
b) ¿Qué beneficios tienen los programas de vacunación sistemática de una población? ¿Que objetivos persiguen?Justifica la respuesta
La respuesta correcta para esta pregunta abierta es la siguiente.
A pesar de que no se anexan opciones o incisos para responder, podemos comentar lo siguiente.
Los beneficios que tienen los programas de vacunación sistemática de una población son varios. Entre ellos, mantener un programa continuo y esquemático de reforzamiento de la inmunidad de las personas para fortalecer la prevención de enfermados y limitar que se esparza esa enfermedad entre la población.
¿Qué objetivos persiguen?
El poder inmunizar a la población de manera masiva y llevar un mejor control del registro de vacunación, Este tipo de programas se enfoca en la prevención de la enfermedad y protege a la mayoría de la población, sobre todo a la vulnerable.
Which age pyramid has the largest base of pre-reproductive population ?
Answer:
By looking at all the age population pyramids, this would be my best guess. Every territory is different with various populations, however, to the best of my knowledge, it would be the expansive pyramid. Expansive population pyramids are used to describe populations that are young and growing.
Generate a random protein sequence that is 5 amino acids long.
Answer:
Random protein sequence 5 amino acids long
LYSINE - GLUTAMINE - VALINE - GLYCINE - LEUCINE
Explanation:
Proteins are macronutriens formed by amino acids. Amino acids are the monomers of proteins, meaning they are the structural units. These organic compounds are made of amino and carboxyl groups.
For every amino acid there is a DNA sequence:
Lysine: AAA
Glutamine: CAA
Valine: GTG
Glycine: CCC
Leucine: AAT
This protein sequence of 5 amino acids long would be like this in its DNA:
AAA CAA GTG CCC AAT
which two sentences best explain what happens to the energy snails get fromo the plants they eat?
A.the snalis use about 1%
Answer:
Explanation:
D and c
Answer:
I think it's B and D.
Explanation:
What would happen is rabbits from a warm, southern climate were moved to a cold, northern climate?
Answer:
They would freeze and it would be hard to find food because they are not accustomed to the different climate. They would also be easy prey because of the environment change they are not equipped for.
Answer:
The answer would be that they would adapt by growing thicker coats.
Explanation:
If hair growth is related to temperature then the rabbits will grow more hair to adapt the cold norther climate.
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You are studying soil samples from a particular area. You notice a reddish color present in the soil. Explain the weathering process that contributed to the soil's color.
Answer:
Oxidation is the reaction of rock minerals with oxygen, thus changing the mineral composition of the rock. When minerals are rock oxidize, they become less resistant to weathering.
Explanation:
Distinguish between an acid and alkaline slant?
Answer:
Acid slant: yellow, fermentation of glucose and lactose and/or sucrose. High concentration creates excessive acid formation
Alkaline slant: red, limited glucose in the medium and limited acid formation.
The pH of acids is less than 7. Alkalis have a pH more than 7 The pH of neutral substances is 7. If metal oxides are soluble in water, they are alkaline. Non-metal oxides are acidic, if soluble in water.
What are acids?An acid is a molecule or ion that can either donate a proton (Bronsted-Lowry acid) or form a covalent bond with an electron pair (Lewis acid). The proton donors, also known as Bronsted-Lowry acids, are the first type of acid.
Only dextrose fermentation produces an alkaline/acid (red slant/yellow butt) reaction.
The fermentation of dextrose, lactose, and/or sucrose is indicated by an acid/acid (yellow slant/yellow butt) reaction.
An alkaline/alkaline reaction occurs when as a result, carbohydrate fermentation does not occur.
The presence of red (alkaline) in the slant and butt indicates that the organism being tested is a nonfermenter.
The formation of hydrogen sulfide results in a black precipitate in the butt of the tube. The splitting and cracking of the medium indicates gas production.
Thus, these are the basic difference between acid and alkaline slant.
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What does it mean when organisms are in the same horizontal line
in a cladogram
Answer:
A cladogram is a diagram used to represent a hypothetical relationship between groups of animals, called a phylogeny. A cladogram is used by a scientist studying phylogenetic systematics to visualize the groups of organisms being compared, how they are related, and their most common ancestors. A cladogram can be simple, comparing only two or three groups of organisms, or it can be enormously complex and contain all the known forms of life.
Cladogram design is universal, although simple. A cladogram consists of the organisms being studied, lines, and nodes where those lines cross. The lines represent evolutionary time, or a series of organisms that lead to the population it connects to. Nodes represent common ancestors between species. At some point in the past a population of common ancestor organisms was divided, giving rise to the different organisms being studied. Some cladograms show evolutionary time through the scale of the lines, longer lines meaning more time. Some cladograms chose to show extinct species, while others omit them. Any particular cladogram is formulated specifically for the use it is needed.
breathe free
TRUe or false A gene in the genome of a newly discovered microorganism can be assigned a function if that gene is paralog of a gene without an experimentally known function ?
What is the correct order?
Answer:ookkk
Explanation:soososdasDklkl.SDmASL:>dmASL:kd ;aSdlAS"
d;[]
as
ASd
asdas
;d'
a'ds
a;'
adasd;'
;'
d;'
asd;'
asd;'
asd;'
;'
HOPE U GET IT CORRECT MUAHAHAHAHAHAHHAHAHA
ead the statement.
For an organism, a section of the DNA code reads CAATCT. Over time, two species form from this population. Species 1 has a mutation in this region; it has CTATCT. Species 2 has another mutation; it has CAATAT.
Scientists discover a new organism, species 3. The new organism has the code CTATCG for the same section.
Which option is most likely true for species 3?
Select one:
Species 3 is not likely to be related to species 1, species 2, or their common ancestor.
Species 3 has most likely evolved from the same common ancestor as species 1 and species 2.
Species 3 has most likely evolved from species 1.
Species 3 has most likely evolved from species 2.
thanks for the help
Answer:
code reads CAATCT. Over time, two species form from this population. Species 1 has a mutation in this region; it has CTATCT. Species 2 has another mutation; it has CAATAT.
Scientists discover a new organism, species 3. The new organism has the code CTATCG for the same section.
Which option is most likely true for species 3?
Select one:
Species 3 is not likely to be related to species 1, species 2, or their