Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.
Explanation:
Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.
When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.
For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.
Can DNA leave the nucleus ?
Yes
Or
No
No it never leaves the nucleus, that's wear it is located
Mistletoe extracts water and nutrients from the spruce to the spruce tree's detriment. What relationship is shown here between the mistletoe and the tree?
A.Competition
B.Parasitism
C.Mutualism
D.Commensalism
Mistletoe extracts water and nutrients from the spruce, to the spruce tree's detriment. The relationship that is shown here between the mistletoe and the tree is Parasitism. Hence, the correct option is B.
What is Parasitism?Parasitism refers to a type of symbiotic relationship in which one organism benefits at the expense of the other organism, which is called host. The parasite lives on or inside the host and derive nutrients as well as shelter from the host, thereby providing no benefit to the host in return.
Examples of parasites includes tapeworms, roundworms, lice, fleas, and some species of bacteria and viruses.
Parasitism is a common for of symbiosis in nature and play an important role in shaping the relationships between species and maintaining balance in ecosystem. Hence, the correct option is B.
For more details regarding parasitism, visit:
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A stimulus is anything that causes a reaction or response. What is an example of an outside stimulus and an inside stimulus?
Answer:Stimulus: any change in an organism's environment that causes the organism to react. It is a fancy way of saying “cause”. Example: An animal is cold so it moves into the sun.
Explanation:
Answer:
hi
Explanation:
any change in an organism's environment that causes the organism to react. It is a fancy way of saying “cause”. Example: An animal is cold so it moves into the sun.
What variables would you likely need to control? Check all that apply.
Which situation is a result of crossing-over during meiosis?
A
Genes are duplicated exactly, ensuring that offspring will be
identical to the parents.
B
Chromatids thicken and align themselves, helping to ensure
genetic continuity.
с
Genes are rearranged, increasing the variability of offspring.
D
Chromatids fail to sort independently, creating abnormal
chromosome numbers.
Answer:
C
Explanation: Genes are rearranged due to crossing over and offspring can vary in traits and appearance
How does nuclear power compare to coal, oil, and natural gas?
Explanation:
Nuclear Has The Highest Capacity Factor
That's about 1.5 to 2 times more as natural gas and coal units, and 2.5 to 3.5 times more reliable than wind and solar plants.
A large bowl contains a mixture of soil and iron powder. What would be the best way to separate the iron powder from the soil?
Answer:
Add magnet to the bowl, cover the bowl, and shake well
Explanation:
Anything with MAGNET
what amendment to the us constitution had the police violated
Answer: Fourth Amendment
Explanation:
Did you mean: what amendment to the us constitution has the police violated
Fourth Amendment.
What time period was the Pakicetus?
Explanation:
Pakicetus is an extinct genus of amphibious cetacean of the family Pakicetidae, which was endemic to Pakistan during the Eocene, about 56 to 41 million years ago.
Answer: Was found 50 million years ago during the Early Eocene Period. It was found in 1983.
Explanation:
Hope this helps
Classical biotechnology begins around 1800,
O True
False
Answer:
True
Explanation:
Which of the following describes a negative feedback loop?
A. When the heart rate is too high, the body releases hormones that continually increase the heart rate higher.
B. When a pregnant woman is in labor, the body releases hormones that increase the intensity of contractions, which then increases the secretion of the same hormones.
C. When blood sugar concentration is above normal, the endocrine system releases hormones that lower the blood sugar concentration until it reaches a normal level, and the release of the hormones slows.
D. When a person is jogging, the body releases hormones that continually decrease the rate of oxygen supply to the legs.
ANSWER is A
When blood sugar concentration is too low, the endocrine system secretes hormones that increase blood sugar concentration to a normal level.
Explanation:
If two hybrid tall pea plants are crossed what is the probability that the offspring will have the tall phenotype?
Answer:
There is a high probability that the Pea plant will have a High phenotype!
Explanation:
Because both "parent plants" are tall, this will cause the offspring to also be tall, this will be because it in it's genes or in other words DNA too be strong.
The mass of a cylinder of beetroot was 2.5 g. If its final
mass was 2.7 g, what was the
increase in mass in per cent?
Answer: The percent increase in the mass of cylinder of beetroot is 8%.
Explanation:
To calculate the percent increase in the mass of cylinder, we use the equation:
[tex]\%\text{ increase in mass}=\frac{\text{Final mass - Initial mass}}{\text{Initial mass}}\times 100[/tex]
We are given:
Final mass of the cylinder = 2.7 g
Initial mass of the cylinder = 2.5 g
Putting values in above equation, we get:
[tex]\%\text{ increase in mass}=\frac{2.7-2.5}{2.5}\times 100\\\\\%\text{ increase in mass}=8\%[/tex]
Hence, the percent increase in the mass of cylinder of beetroot is 8%.
Please Help i will give brainliest
Answer:
1. it establishes the foundation for food webs and food chains.
2. preservation of biodiversity prevents the extinction of species
Explanation:
Biodiversity gives a role to every species, whether or not it may seem important. By establishing a food chain, the roles of each organism is fulfilled as an ongoing cycle. If we didn't have this, there could end up being too many animals.
1 The blank
is the sun and
all of the planets and other bodies that travel
around it.
Answer:
solar system
Explanation:
Help. It is due today
Answer: B
Explanation: tadpoles lack limbs and possess longtails, adult frogs on the other hand have two hind limbs and two fore limbs
HELP PLZ Which landform is highlighted in the image?
O hills
O mountains
O plains
O plateau
Answer:
I may be wrong, but isn't that the Rocky Mountain Range?
Answer: b. Mountains
Explanation:
PLEASE HELP ASAP (; question in photo
Answer:
im like 99% sure its D
Explanation:
im sorry if its wrong :(
c. Suppose a large population of turtles consists only of two species, snapping turtle and box turtle, but the percentage of the species in the population are unknown. What is the maximum possible value of the diversity index D for the population
Answer:
[tex]D_m=1/2[/tex]
Explanation:
From the question we are told that
2 species
Assuming that questions a and be are solved
Diversity index D=2p_1p_2
with [tex]p_1 +p_2 =1[/tex]
Mathematically
[tex]D=2p_1(1-p_1)[/tex]
[tex]D=2(p_1-p_1^2)[/tex]
[tex]D=2({\frac{1}{4} -(p_1-1/2)^2}[/tex]
Therefore
[tex]D=\frac{1}{2} -2(p_1-1/2)^2[/tex]
Giving
[tex]D_m=1/2[/tex]
[tex]p_1=1/2[/tex]
How do volcanoes provide evidence to scientists to support the idea that matter and energy move within the Earth’s interior?
Answer:
Scientists use volcanic activity data from this area to show the relationship between volcanic activity and lithospheric plate motion. Hot Spots and Plate Tectonics: A volcanic hot-spot is an area in the mantle from which heat rises in the form of a thermal plume from deep within the Earth. Higher heat and lower pressure at the base of the lithosphere melts rock and forms magma.
Explanation:
energy moves through everything really
Explain how the biosphere receives
phosphorus and nitrogen from the abiotic
realm?
What are the products of photosynthesis?
Answer:
glucose and oxygen
Explanation:
just aced a unit test on this subject
Genes Influence an organism's tralts by coding for:
Answer:
production of proteins
Explanation:
All of the following are true of spermatogenesis EXCEPT: Question 4 options: One spermatogonium produces 4 spermatids Genetically diverse spermatids are created. The products are spermatozoa that each have a head, midpiece and tail. DNA replicates once, but cells divide twice. Spermatids containing 23 chromosomes (1n) are produced.
Answer: The products are spermatozoa that each have a head, midpiece and tail.
Explanation:
The spermatogenesis can be defined as the process of gamete production in human males. It takes place in the testes in males. In this process the spermatids are produced which are four in number through reductional cell division called as meiosis. Each spermatid is haploid in number and the genetic material present in each is diverse as a result siblings are not identical to each other. The spermatozoa is an immature sperm cell which develops head, middle piece and tail. But it is not a precursor of production of sperm cells via cell division.
Here is a pedigree for colorblind (H)
What is fred's genotype?
Answer:
[tex]x^{h} y[/tex]
Explanation:
Fred has inherited the colorblind trait from his mother. We know this because his spot on the pedigree is filled in. Because he is a male his genotype must be some variation of xy and because he is colorblind he must have the recessive "h" on his x chromosome. So his genotype (genetic type) is [tex]x^{h} y[/tex]
What boundary is present at the Philippine plate and the Eurasian plate?
A convergent boundary resulting in earthquakes and volcanic activity
B transform boundary resulting in fault lines and shallow earthquakes
C divergent boundary resulting in mid-ocean ridge and creation of new sea floor
D convergent boundary resulting in mid-ocean ridge and widening of ocean basic
Answer:
D
Explanation:
What was Anna Garcia wearing when she died? 2020
In a completely dark room, you can’t see your reflection in a mirror. Give reason.
[tex]\huge{\underline{\bigstar{\mathfrak{Answer:-}}}}[/tex]
An image is formed due to reflection of light by a plane mirror. In a completely dark room there is no light so no image will be formed by the mirror placed in the room. Hence we will not be able to see our image in a mirror placed in a completely dark room.
Provide at least 1 example of a mutation
that does not have a negative effect on
the individual.
PLEASE HELP ME
The type of selection where the characteristics on both extremes are selected against is
Answer:
stabilizing selection
