Which characteristic is unique to vertebrates?
A) they all have a well-defined skeleton
B) they have no defined organ systems
C) they have bilateral symmetry
D) they have an exoskeleton
Answer: They have well-defined skeleton.
Explanation:
This is because the vertebrates are uniquely characterised by the presence of the bones.
Answer:
Answer is A)They have a well-defined skeleton
Explanation:
most reasonable answer
ba kiểu truyền tín hiệu của tế baò
The Earth and the moon are kept in orbit by gravity and mass. Please select the best answer from the choices provided T F
Answer:
True
Explanation:
the Earth and the Moon are kept in orbit by gravity and mass.
Answer:
True (T)
Explanation:
Yeah, the Earth and the moon are kept in orbit by gravity and mass. Hence, this statement is True (correct).
……………,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Answer:
these r so many which one?
Explanation:
14. What do the embryos of different vertebrate species have in common?
Answer:
Similarities in embryos are evidence of common ancestry. All vertebrate embryos, for example, have gill slits and tails. Most vertebrates, except for fish, lose their gill slits by adulthood.
Explanation:
itz from gologolo lol I hope it helps uh
keep smiling #smilies
What is seed technology?why is still considered as one of the major subject in agriculture?
I need help on this please and thank you!
Answer:
I think it's probably 2,3, and 4 :))
Answer:
renewable resources can be replenished.
most renewable resources are easily available in nature.
all renewable resources are cost effective.
Consider the factors that affect muscular strength. Read each scenario and then identify each label into the appropriate category based on whether each would result in a stronger or weaker muscle contraction.
a. Potassium accumulate in the sarcoplasm
b. Increase in muscle belly circumference
c. Lesser proportion of motor neurons to muscle fibres
d. Begin contractions with muscle already 50% contraction
e. Lower sarcoplasm pH
f. Increased stimulus frequency.
g. Circular arrangement of muscle fascicles
h. increased requirement.
Answer:
1. Weaker contraction:
a. Potassium accumulate in the sarcoplasm
d. Begin contractions with muscle already 50% contraction
e. Lower sarcoplasm pH
g. Circular arrangement of muscle fascicles
2. Stronger Contraction
b. Increase in muscle belly circumference
c. Lesser proportion of motor neurons to muscle fibres
f. Increased stimulus frequency.
h. increased requirement.
Explanation:
Sarcoplasm refers to the cytoplasm of muscle cells which contains ATP, enzymes, and a variety of ions, including potassium (K+). The negative potential required during muscle activity is produced from the disequilibrium of ionic concentrations (mostly Na+ and K+) across the membrane, which is generated through Na+/K+ ATPase pumps. During contraction, a muscle shortens, and thus its circumference increases. The generation of lactic acid is known to lower pH in the sarcoplasm and thus hinder the force and power development of the muscle fibers. Muscle fascicles can be arranged in concentric rings, it is a common pattern in sphincter muscles that modulate the opening and closing of orifices (which have weak contractions). A motor unit refers to a single efferent neuron and all of the muscle fibers it modulates. Each individual muscle fiber is innervated by one motor neuron, whereas a single motor neuron can innervate many muscle fibers. Finally, higher intensity/frequency are known to induce stronger muscular contractions, but also produce a stronger decline in force and cause more rapid muscle fatigue.
number of cell that undergo meiotic division to produce a 216 gametes in gymnosperms is
meiotic devision this is the answer it might help you
Was there any significant difference in appearance between the two bean plants? if so, what was the difference?
Explanation:
the plant in the sunlight will receive green color due to chlorophyll and the plant in the dark will have yellow or white color due to the lack of chlorophyll
What is the complimentary dna strand for TCTTAAATGATCGAT
Answer:
AGAATTTACTAGCTA
Explanation:
The DNA strand pairs are:
Adenine (A) -- Thymine (T)
Cytosine (C) -- Guanine (G)
and vice versa.
The given strand:
TCTTAAATGATCGAT
Based on the given pairs above, your answer will be:
AGAATTTACTAGCTA
~
Without replication, organisms could not successfully
move.
grow and reproduce.
feed.
make proteins.
Answer: grow and reproduce
Explanation:
What is a plant nucleus
Answer:
All plant cells contain a nucleus, a structure that stores DNA and acts as a cell's command center. It is surrounded by the nuclear envelope and is filled with nucleoplasm. ... DNA is copied during DNA replication for new cells, as well as copied to RNA to make proteins in the nucleus.
When curare, a neuromuscular poison, is dropped onto an isolated muscle-nerve preparation in a laboratory, the muscle does not contract when the nerve is stimulated, even though neurotransmitter is released from the nerve cell. Why does this happen
Answer:
Explanation:
Whenever the nerve terminal's action potential depolarizes, calcium enters the cell through the channels. Calcium allows acetylcholine (ACh) to be released more easily. These ACh molecules subsequently circulate into the synaptic cleft and attach to the motor end-plate of the nicotinic cholinergic receptors. Acetylcholine molecules connect to nicotine ion-channel receptors present on cell membrane the of muscle cells, enabling the ion channels to open. Calcium ions then enter the muscle cell, kicking off a series of events that eventually result in muscular contraction.
Curare is a kind of neuromuscular relaxant blocker that is non-depolarized in nature. Nondepolarizing muscle relaxants work as competitive agonists, binding to ACh receptors but failing to activate ion channels. As a result, they inhibit ACh from bonding, preventing the development of endplate potentials and inducing muscle paralysis.
In a Nitrogen metabolism study, the following data were obtained over the test period:
Nitrogen consumed 175 grams
Total Fecal N 35 grams
Metabolic Fecal N 10 grams
Total Urinary N 80 grams
Endogenous Urinary N 10 grams
Calculate:
a. Apparent Nitrogen digestibility (%)
b. True Nitrogen digestibility (%)
c. Nitrogen Balance (g)
d. Apparent Nitrogen Retention (%)
Answer:
a. 80%
b. 86%
c. 60 g
d. 34.29%
Explanation:
From the given information:
The apparent nitrogen digestibility (AD) is the ratio of the difference between the consumed nitrogen and fecal nitrogen to the consumed nitrogen.
Mathematically:
[tex]AD = \dfrac{consumed \ nitrogen - fecal \ nitrogen }{consumed \ nitrogen }[/tex]
[tex]AD = \dfrac{175 -35 }{175}[/tex]
AD = 0.8
To percentage, the apparent Nitrogen digestibility = 80%
b. True Nitrogen digestibility is calculated by the formula:
[tex]=\dfrac{consumed \ nitrogen - (fecal \ nitrogen -metabolic \ fecal)}{consumed \ nitrogen}[/tex]
[tex]= \dfrac{175 -(35-10)}{175}[/tex]
[tex]= \dfrac{175 -25}{175}[/tex]
= 0.86
= 86%
c. Nitrogen Balance = consumed Nitrogen - Fecal nitrogen - total uninary
Nitrogen Balance = (175 - 35 - 80) grams
Nitrogen Balance = 60 g
d. Apparent Nitrogen Retention (ANR) is computed as follows:
[tex]ANR = \dfrac{(consumed \ nitrogen-fecal\ nitrogen - total \ uninary )}{nitrogen \consumed }\times 100\%[/tex]
[tex]ANR = \dfrac{(175-35- 80 )}{175 }\times 100\%[/tex]
[tex]ANR = \dfrac{(60 )}{175 }\times 100\%[/tex]
ANR = 34.29%
Explain the role of enzymes to living organisms
Explanation:
enzymes create chemical reaction in the body.But they actually speed up the rate of chemical reaction to help support life.. Enzymes is important to our body as it supports in building muscles and destroying toxins..
Which of the following is true
about true-breeding plants if they are allowed to self-pollinate?
A. They never have offspring with the same traits as the parent plant.
B. They have offspring with traits that are identical to the parent plant with one or two differences.
C. They always have offspring with traits identical to the parent plant.
Answer:
b
Explanation:
some are the same while others are different (traits)
what will most likely happen if a population is large and no migration, mutation, or environmental change occurs?
1. natural selection will increase
2. nonrandom mating will start to occur
3. the rate of evolution will increase
4. gene frequencies will remain constant
Phân tích các yếu tố cho thấy ĐẤT là môi trường đa dạng nhất về các loại sinh vật?
.... what you wrote isn’t a question.... you wrote a statement.....
Here is what you wrote translated to English
Analysis of factors shows that SOIL is the most diverse environment in terms of organisms?
Answer:
I don't no answer sorry
Explanation:
follow
Which of the following techniques employs a probe consisting of a labeled, single-stranded DNA of known sequence that can find and bind to a complementary sequence present in a large sample of different DNA sequences?
a. DNA hybridization
b. RFLP
c. PCR
d. DNA sequencing
Answer:
Explanation:
PCR
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Which statement accurately identifies the order of tissues pictures left to right in the microscopic image?
a) Epithelial cells, smooth muscle, connective tissue
b) Connective tissue, epithelial cells, smooth muscle
c) Epithelial cells, connective tissue, smooth muscle
d) Connective tissue, smooth muscle, epithelial cells
Answer:
The correct answer is - d) Connective tissue, smooth muscle, epithelial cells.
Explanation:
The connective tissues are the tissue layers that protect the outside of arteries and veins. The thick outermost layer of a tunica adventitia and other, made of connective tissues.
The middle layer that has tunica media that s made up of outer connective and smooth muscles in the inner or middle and in the innermost layer is made up of epithelial layer.
As per the image given the statements that describe the tissues from the left to right in a microscopic image are connective tissue, smooth muscles, and epithelial cells.
The connective tissues support and protect and give stricture. The smooth muscles are involuntary non straighter muscles. The epithecal cells that line the surface of the body.Hence the option D is correct.
Learn more about the statement accurately identifies.
brainly.com/question/23999747.
3. DNA and Protein similarities are often used for molecular evidence of evolution. What is being compared to show relatedness among species? Explain how this works.
Answer:
The sharing of common ancestors
What is the role of RNA?
Answer:
It is the 1st one ○ to provide the original blueprint for protein production
Explanation:
RNA polymerase (green) synthesizes RNA by following a strand of DNA. RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, duyring the process of transcription.
Which statement explains the goal of using sustainable practices in food
production?
A. It feeds a growing population without harming ecosystems or
humans.
B. It feeds a shrinking human population while still preserving
ecosystems.
C. It keeps a few populations healthy while still generating high
profits
D. It keeps farmers in business by earning them the highest profits.
Answer: A. It feeds a growing population without harming ecosystems or humans.
Explanation:
Sustainable food production refers to the method of using processes that conserve non-renewable energy, non-polluting, economically efficient, and are also safe for everyone in the society. Also, the needs of the future generation isn't compromised.
The statement explains the goal of using sustainable practices in food
production is to feed a growing population without harming ecosystems or humans. Therefore, the correct option is A.
a phlebotomy technician has collected a neonatal screening card. which of the following actions should the technician take to properly dry the blood stop collection card?
Answer:
place the card on a flat dry surface
Complete each sentence with the correct word or phrase
a. An action potential reaches the axon terminal causing __________to open.
b. Acetylcholine diffuses across the synaptic cleft before binding to its receptor, which is located on the _____
c. When the membrane potential reaches ________an action potential spreads across the sarcolemma due to the opening of ___________
d. In response to acetylcholine binding, ________ move into the muscle fiber causing the membrane potential to rise.
Answer:
a). Voltage-gated Ca2+ channels
b). the motor end plate
c). Threshold, voltage-gated Na channels
d). sodium ions
Explanation:
a). The voltage-gated [tex]Ca^{2+}[/tex] channels are the key transducers of the membrane potential that changes into a intracellular [tex]Ca^{2+}[/tex] transients which initiates the physiological events. When the action potential makes a contact with axon terminal, the voltage-gated [tex]Ca^{2+}[/tex] channels opens.
b). The acetylcholine is the main neurotransmitter of the parasympathetic nervous system. It helps in blood vessels dilation, muscle contraction, and perform many more functions.
It diffuses with the synaptic cleft that is located on the motor end plate of the nervous system.
c). The membrane potential is also known as the membrane voltage or the transmembrane potential. When it recaches the threshold, the voltage-gated Na channels opens to spread the action potential across sarcolemma.
d). The sodium ions in case of acetylcholine binding moves to the muscle fiber due to which the membrane potential rises.
Which of the following findings would lead you to determine that an infant's airway is open
Answer:
blowing air into his/her mouth and checking for an increase in the thoracic region........I GUESS
Why are temperatures hotter in locations near the equator?
Dehydration synthesis leads to WICH formation
Answer:
Polymers...........
Explanation:
