Answer:D
Explanation:
. Chromosomes line up at the metaphase plate, under tension from the mitotic spindle.
In the metaphase, mitotic spindle attaches to the chromosome's centromeres and lines them up in the middle of the cell. The correct option is D.
What are spindle fiber?Spindle fibers form a protein structure that divides a cell's genetic material. The spindle is required to split the chromosomes in a parental cell evenly into two daughter cells.
During metaphase, these spindle fiber gets attached to centromere of the chromosome and align the chromosome at the equator.
Long protein fibers known as microtubules prolong from the centrioles in all directions, forming a spindle. Some microtubules connect the poles to the chromosomes via protein complexes known as kinetochores.
Spindle fibers from the opposite side of the cell connect to the chromosome's both these sister chromatids.
They connect at the kinetochore, which comprises a disc or protein on each side of the centromere. The chromosomes will be moved by the spindle fibers until they are aligned at the spindle equator.
Thus, the correct option is D.
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give a short introduction of carl von linnaues and rh whittakers regarding classification of living beings one major point
Which of the following is an example of a natural selection?
1 point
All grey squirrels have not changed for a 1,000 years
Birds developed wings because they wanted to fly.
Fish developed gills because they wanted to move to land.
A new species of purple squirrels forms due to a change in the ecosystem.
Answer:
A new species of purple squirrels forms due to change in the ecosystem
Explanation:
Key part: Change in the ecosystem
What maintains the concentration gradient across
respiration membranes?
A. Ventilation
B. Cartilage
C. Spiracles
D. Cohesion
I NEED HALP ASAP PLEASE!!!! Choose an organism and predict a trait that would be helpful for its survival. Do you think this could be an evolutionary change? What would have to happen for this trait to be expressed?
Answer: A kangaroo rat. They can survive on small amounts of water and with stand high temperatures. Plus they're really cute. It could most defiantly be an evolutionary change. They were put in the desert
Which process occurs when bacteria converts nitrogen gas to a usable form?
Answer:
Fixation
Explanation:
Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. The majority of nitrogen is fixed by bacteria, most of which are symbiotic with plants. Recently fixed ammonia is then converted to biologically useful forms by specialized bacteria.
What would be the appropriate si unit for the height of a cow?
Explanation:
metre would be the approriate si unit
Which of the following is NOT true of enzyme activity? a. enzyme shape may change during catalysis b. the active site on an enzyme orients its substrate molecules, therby promoting interaction of their reactive parts c. all enzymes have an active site where substrates are temporarily bound d. each enzyme can catalyze a wide variety of different reactions
Answer:
D. Each enzyme can catalyze a wide variety of different reactions
Explanation:
Each enzyme can only catalyze a few, specific types of reactions.
Since enzymes and substrates are very specific to one another, enzymes cannot catalyze a wide variety of reactions.
If a substrate is not the correct one that fits in the enzyme's active site, a reaction will not occur.
So, each enzyme can only assist in a few reactions.
The correct answer is D. Each enzyme can catalyze a wide variety of different reactions
The hormone oxytocin is released to increase contractions during childbirth. The pathway is activated with pressure from the baby's head against the opening of the uterus. This is an example of
positive feedback, because the response increases the rate of the organism's metabolism
negative feedback, because the response decreases the rate of the organism's metabolism
positive feedback, because the response intensifies the original stimulus
negative feedback, because the response intensifies the original stimulus
Answer:
positive feedback, because the response intensifies the original stimulus
Explanation:
The release of it is increasing contractions making it positive
The hormone oxytocin is released to increase contractions during childbirth, and the pathway is activated with pressure from the baby's head against the opening of the uterus, so it is a positive feedback because the response intensifies the original stimulus that is present in the third option.
What is the importance of the hormone oxytocin in childbirth?Oxytocin, a hormone that plays an important role in the process of childbirth, is produced in the posterior pituitary during labor, and oxytocin is responsible for stimulating contractions of the uterus, which help to push the baby through the wall of the uterus. Oxytocin makes the bond between a mother and her newborn baby, as it is released in large amounts during childbirth and breastfeeding and helps to create a strong emotional bond.
Hence, the hormone oxytocin is released to increase contractions during childbirth, and the pathway is activated with pressure from the baby's head against the opening of the uterus, so it is a positive feedback because the response intensifies the original stimulus that is present in the third option.
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Which of the following processes would be an example of an anabolic pathway?
A set of coupled reactions that are exergonic
A set of reactions that break covalent bonds between molecules to release free energy
A set of reactions that release energy that can be used to drive cellular work
A set of reactions that combine monomers into larger, more energy-rich polymers
Answer:
A set of reactions that release energy that can be used to drive cellular work
Explanation:
I think im not so sure!!
Answer:
The answer is
D - a set of reactions that combine monomers into larger, more energy-rich polymers
Explanation:
I can't explain it, I just know I'm right!
1. Explain using diagram how monomers are arranged in Thermoplastic and Thermosettingplastics.
Explanation:
In thermoplastics, the arrangement of monomeric units is linear and in thermosetting plastics, it is cross-linked. Thermoplastics are usually soft, weak and less brittle, so can get soften on heating and stiffen on cooling. They can be melted, remoulded and recycled easily.
The heart is an example of which level of organization within an organism?
cell
organ
tissue
оо
organ system
Answer:
tissue is a right answer
tissue is the right answer the heart is an example of tissue.
How do we aquire knowledge in science?
Answer:
By studiying and aying attention in class
Explanation:
Answer:
The answer is:
By studying. By exploring. By paying attention to the lessons)
Explanation:
Convert 90 centuries to minutes using the method of dimensional analysis.
[tex]\huge\text{Hey there!}[/tex]
“[tex]\large\text{Convert 400 mm to m}[/tex]”
[tex]\large\text{Just simply divide 400 by 1,000 and you will have your result.}[/tex]
[tex]\mathsf{\dfrac{400}{1,000}}[/tex]
[tex]\mathsf{= \dfrac{400\div200}{1,000\div200}}[/tex]
[tex]\mathsf{400\div 200 = \bf 2}[/tex]
[tex]\mathsf{1,000 \div 200 = \bf 5}[/tex]
[tex]\mathsf{= \bf \dfrac{2}{5}}\rightarrow\mathsf{\bf 0.4}[/tex]
[tex]\boxed{\huge\textsf{Therefore, your ANSWER is: \boxed{\bf \dfrac{2}{5} \ or \ 0.4}}}\huge\checkmark[/tex]
[tex]\huge\text{Good luck on your assignment \& enjoy your day!}[/tex]
~[tex]\frak{Amphitrite1040:)}[/tex]
InformationHow did
the discovery of isotopes disprove one part of
Dalton's atomic theory
Answer: Because Daltons theory states all atoms of a given element are identical in mass and properties.
Explanation:
The discovery of isotopes demonstrated that atoms of the same element can have different atomic weights, implying that atoms of the same element are not identical in every way.
What is Dalton's atomic theory?Dalton's atomic theory postulated that matter is made up of indivisible particles known as atoms, and that atoms of the same element are all identical and cannot be created or destroyed.
Compounds are formed by the simple combination of atoms into compound atoms.
Dalton, John Experiments with gases became possible at the turn of the nineteenth century, prompting John Dalton to propose a modern theory of the atom based on certain assumptions.
Dalton's theory is debunked. This is because Dalton's theory states that all matter is made up of identical, indivisible, and indestructible atoms. Isotopes have the same element but a different number of neutrons.
Thus, this way, the discovery of isotopes disprove one part of Dalton's atomic theory.
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Identify the graph that matches each of the
following stories:
a. I had just left home when I realized I had forgotten my books so I went back to pick them up.
b. Things went fine until I had a flat tire.
c.I started out calmly, but sped up when I realized I was going to be late.
Answer:
A. 4, B. 2, C. 1
Explanation:
Equilibrium is when the concentration is the same throughout an entire system. Explain how a cell reaches equilibrium in all three types of solutions (hypertonic, hypotonic, and isotonic).
It is pertinent to understand what hypertonic, hypotonic, and isotonic solution means before setting out to explain how a cell reaches equilibrium in each type of solution.
A hypertonic solution is one whose solute concentration is higher than that of the sap of a cell that is immersed in it.A hypotonic solution is one with the same solute concentration as that of the sap of the cell immersed in it.An isotonic solution has a lower solute concentration than that of the sap of the cell immersed in it.In biological systems, water molecules move by osmosis from the region of higher water potential or lower concentration of solutes to the region of lower water potential or higher concentration of solute. An equilibrium is reached when there is no net movement of water between two sides. Hence;
A cell placed in a hypertonic solution will lose water to the surrounding solution until an equilibrium is reached. This means that such a cell will end up shrinking (wilting) or even dying due to loss of water from the cell sap.A cell placed in a hypotonic solution will gain water from the surrounding solution until there is no net movement of water anymore. Such a cell might become turgid or even burst out its cell content.A cell placed in an isotonic solution will neither gain nor lose water because the cell sap and the surrounding solution have equal solute concentrations.More about osmosis here: https://brainly.in/question/1213189
Answer:
A cell placed in a hypertonic solution will lose water to the surrounding solution until an equilibrium is reached. This means that such a cell will end up shrinking (wilting) or even dying due to loss of water from the cell sap.
A cell placed in a hypotonic solution will gain water from the surrounding solution until there is no net movement of water anymore. Such a cell might become turgid or even burst out its cell content.
A cell placed in an isotonic solution will neither gain nor lose water because the cell sap and the surrounding solution have equal solute concentrations.
Help!!!! Give a simple overview of the process of photosynthesis.
Answer:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.
Explanation:
This transforms the water into oxygen and the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.
Anyone know the answer
Answer:
b.nuclear energy to heat energy to electrical energy
the results of an experiment can be validated through replication true or false
Answer:
True through replication
Answer:
this is true
Explanation:
What is the role of messenger RNA in transcription?
Answer:
carries instructions to make proteins to make DNA plz mark me as brainliest :)
Explanation:
A person always feels hungry, even a short time after eating. This person also has high blood calcium levels. This person could have a disorder with which glands?
Hypothalamus; thyroid
Pineal; thyroid
Hypothalamus; adrenal
Pineal; adrenal
The correct glands are hypothalamus and thyroid gland.
The HYPOTHALAMUS is a part of the forebrain which is the main co-ordinating and control center for the autonomic nervous system. It plays an important role in homeostasis. It
--> regulates body temperature and the body's urges such as thirst and hunger by impulses it sends along the autonomic nervous system; and
--> controls endocrine secretions by monitoring the metabolites and hormone levels in blood.
The THYROID GLAND is an endocrine gland located in front of the larynx and trachea. This gland is known to produce a hormone called calcitonin from its parafollicular cells.
The calcitonin is secreted when there is high level of calcium in the blood, opposing the effects . Therefore it helps in the regulation of calcium levels in the blood. A disorder of the Thyroid gland can lead to absence of this hormone, calcitonin, thereby leading to high levels of calcium in the blood.
THEREFORE, the correct glands are HYPOTHALAMUS and THYROID GLAND.
PINEAL GLAND is NOT correct because it a gland located at the brain, which involves the secretion of the hormone melatonin which is associated with development of sec organs.
ADRENAL GLAND is NOT correct because the secretions from this gland helps in regulation of metabolism of the body.
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Identify functions of ATP. Multiple select question. To power transport across cell membranes To power the movement of cells To accept electrons during oxidation-reduction reactions To drive energetically unfavorable reactions To store information within the cell
From the given options, the functions of ATP include:
To power transport across cell membranes.To power the movement of cells.To drive energetically unfavorable reactions.Adenosine Triphosphate (ATP) is defined as the energy molecule that is derived from the metabolic oxidation of glucose.
This ATP is used for a variety of processes which include:
Active transport: It provides the energy that is needed to move materials against a concentration gradient. This leads to the transport of the materials across cell membranes.Movements: Muscle contraction and ciliary movement which brings about movement in cells, requires energy from the hydrolysis of ATP.Thermodynamically unfavorable reaction: This can be driven by the hydrolysis of ATP energy molecule in a cell.Learn more here:
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A field of sunflowers facing the sun is an example of
Answer:
Phototropism
Explanation:
Phototropism. Although both types of movement orient plants toward a light source, heliotropism is not the same as phototropism. Phototropism is the term that describes the growth of a plant toward any light source.
Answer:
Phototropism. Although both types of movement orient plants toward a light source, heliotropism is not the same as phototropism. Phototropism is the term that describes the growth of a plant toward any light source.
Explanation:
Image result for A field of sunflowers facing the sun is an example of
Continuously facing towards the east also helps the flowers to heat up quickly. This gives them an advantage in pollination, as warm flowers attract insects. Therefore, in the plant's interest, the flower always faces the sun and is therefore always clearly visible to these important pollinators.
how does a cow drink water
Answer:
cow will line up side by side and drink
Explanation:
They have to dip their mouth in without suck- ing air at the sides of their lips.ep 3
I Name the following: 1. It is the mechanism of inheritance of characters from the parental generation to the offspring.
Answer:
yes
Explanation:
even with some characteristics it can be past down with out even being around said parent mostly things like habits example: being more likely to have a addiction to anything doesn't have to be bad substances it part of ur gene make up
After phosphates and nitrates have entered a water
system, identify the correct steps of Eutrophication.
I. Oxygen levels drop
II. Underwater plants die
III. Fish and invertebrates die
IV. Algae grows rapidly
A. II, III, IV, I
B. IV, II, I, III
C. I, III, IV, II
D. III, II, I, IV
After phosphates and nitrates enter a water system, the steps of eutrophication include the rapid growth of algae, death of underwater plant species, depletion of oxygen in the water, and the death of fishes and invertebrates. The correct option would be B.
Eutrophication refers to the excessive enrichment of water bodies by nutrients such as phosphates and nitrates thereby facilitating the rapid growth of some aquatic species with negative effects.
Once a water body becomes excessively enriched with phosphates and nitrates, the following is a sequence of events that follows:
Algal bloom: the nutrients facilitate the rapid growth of algaeThe bloom of algal species results in the death of underwater plants as a result of inadequate light.The death of the underwater plants and the accompanying microbial activities in decomposing them cause oxygen levels in the water to drop.Reduction in oxygen level causes fishes and other water invertebrates to die due to hypoxiaTherefore, the correct steps of eutrophication according to the illustration is IV, II, I, and III.
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The thin external covering is similar to the
. The organelle with a texture like sandpaper is the
.
Answer:
The thin external covering is similar to the Cell Membrane. The organelle with a texture like sandpaper is the rough endoplasmic reticulum (ER)
Which of the following materials has the highest porosity?
O A. Asphalt
OB. Concrete
OC. Clay
OD. Sand
Answer:
clay is the answer budyy
¿En qué momento se produce la hinchazón del tejido?
Answer:
Es el agrandamiento de órganos, piel u otras partes del cuerpo, causado por la acumulación de líquidos en los tejidos. La presencia de líquido extra puede llevar a un aumento rápido de peso durante un período corto (de días a semanas).
Question 17 of 25
Why do plants produce more carbon dioxide than oxygen during the night?
O A. Respiration produces oxygen during the day and carbon dioxide at
night.
B. Respiration can happen without sunlight, but photosynthesis
cannot.
O C. Respiration can only occur when there is no available sunlight.
O D. Photosynthesis only produces carbon dioxide during the night.
SUBMIT
Answer:
B
Explanation:
Respiration can happen without sunlight,but photosynthesis cannot.and photosynthesis doesn't take place at night,so less carbon dioxide is used up than it is produced.
I hope this helps
