The cell in the diagram below illustrates a stage of mitotic cell division.
Letter B indicates the
1. Paired chromosomes
2. Centrioles
3. Cell plate
4. Endoplasmic reticulum
Answers
Letter B in the cell diagram illustrating a stage of mitotic cell division indicates the centrioles.
One of the main functions of the centrioles during cell division in the animal cell is to help in the formation of spindle fibers.
The fibers attach to chromosomes at the centromeres during metaphase and their shortening leads to the pulling apart of sister chromatids. Continuous shortening helps chromatids to complete their migrations to the poles.
Centrioles are vital parts of the centrosomes and are found only in animals, fungi, and some algal cells. In the diagram, the two centrioles can be seen at the two poles of the cell.
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Related Questions
19. An organism's gametes have_________________
the number of chromosomes found
in the organism's body cells. (In Biology)
Answers
An organism's gametes have half the number of chromosomes found in the organism's body cells.
Explanation:
The gametes or germ cells are haploid (n) in nature while the somatic or other body cells are diploid (2n) in nature.
An organism's gametes have half the number of chromosomes compared to its somatic cells; gametes are haploid while somatic cells are diploid.
An organism's gametes have half the number of chromosomes found in the organism's body cells. Body cells, also known as somatic cells, contain a diploid number of chromosomes (2n), which means they have two sets of chromosomes. In humans, this is 46 chromosomes (23 pairs).
However, gametes, which are the reproductive cells like sperm and eggs, contain a haploid number of chromosomes (n), which is just one set from each pair. When gametes unite during fertilization, they restore the diploid number in the resultant embryo, thus ensuring that the offspring has a complete set of genetic information.
when a man has an allele combination Ww for a trait, what percentage of his gametes will have a dominant allele for the trait?
a.) 75%
b.) 100%
c.) 25%
d.) 50%
Answers
Answer:
The correct answer is option d) 50%.
Explanation:
Humans are diploid organisms who have 23 pairs or 46 chromosomes in their genome.Each pair of chromosomes can also called as a pair of alleles.Alleles are alternating forms of the same gene. Of the 46 chromosomes, 23 are obtained from the mother and rest 23 from the father.According to Mendel's law of dominance, the alleles can be either dominant or recessive. A dominant allele can show its character even if only a single copy of it is present in the diploid organism, while a recessive allele gets expressed only when both the allele present are recessive.Unlike somatic cells which are diploid, gametes are haploid, that is, they possess only one allele for one gene.According to Mendel's law of segregation, the allele representing each gene separate from each other during gamete formation, such that, each gamete gets a single allele representing each gene. The man having an allele combination Ww for a particular trait, has one dominant allele (W) and the other recessive allele (w). The gametes produced by this man will have either a dominant allele (W) or a recessive allele (w). Out of the two types of gametes (W and w), produced by the man, one has the dominant allele (W).The ratio of dominant allele(W) containing gamete to number of gametes possible (W or w) is 1 : 2.Therefore, percentage of the man's gametes that will have a dominant allele is 50% (by converting the ratio into percentage).When a man has an allele combination Ww for a trait, the percentage of his gametes that will have a dominant allele is 50%.
WHAT IS SEGREGATION OF ALLELES:An allele is a member of a gene, which comes in pairs. According to Gregor Mendel in his law of segregation, alleles separate into gametes equally.This means that a man with a heterozygous allele combination of Ww will undergo segregation of alleles W and w equally into gametes.Therefore, when a man has an allele combination Ww for a trait, the percentage of his gametes that will have a dominant allele is 50%.
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Which of the following is not a component of the cell theory?
- cells are the basic unit of organization in organisms
-all living things are made of cells
-all cells contain nuclei
-all cells come from pre-existing cells
Answers
That all cells contain nuclei is NOT a component of the cell theory
Explanation:
Not all cells contain a nuclei. Cells are even categorized based on this attribute. Eukaryotic cells have a nucleus while prokaryotic cells do not. This property, therefore, cannot be used to categorize all cells. Prokaryotic cells have a nucleoid, which is not a true nucleus, but only a region in the cell where the genetic material of the cell can be found.
The other 3 choices are the universally-accepted tenets of the cell theory;
-cells are the basic unit of organization in organisms
-all living things are made of cells
-all cells come from pre-existing cells
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The cell theory states that cells are the basic unit of organization in organisms, all living things are made of cells, and all cells come from pre-existing cells. However, not all cells contain nuclei.
Explanation:In the cell theory, all of the following components are true except for the statement that all cells contain nuclei. While many cells do have nuclei, there are exceptions to this rule, such as red blood cells and some bacteria, which lack a nucleus. The other components of the cell theory are that cells are the basic unit of organization in organisms, all living things are made of cells, and all cells come from pre-existing cells.
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What type of material is exchanged during "crossing over"?
Answers
Answer:
gentic materal
Explanation:
Alleles are swapped when crossing over
Answer:
Chromosomal crossover, or crossing over, is the exchange of genetic material between two homologous chromosomes non-sister chromatids that results in recombinant chromosomes during sexual reproduction.
Explanation:
Humans need clean air, freshwater, food, and shelter to survive.
a. How could one person living alone in the wilderness obtain food without help
from anyone else? (2 points)
b. How could many people living in a community obtain food? (2 points)
c. How could living in a community increase the survival rate of individuals when
it comes to obtaining food resources? (1 point)
I'll mark brainlest
Answers
Answer:
a) A person living in the wilderness can obtain food by feeding on the different plants and trees in the area. Once, he gets a knowledge of the plants which are edible, he can start to even grow them if he plans to stay for a long time.
b) Many people living in a community can obtain food from many different resources. The can plant fruits and vegetables. They can hunt for wild life animals and cook them.
c) A person living in a community will be able to get more ideas for obtaining food resources. The work of finding the food resources will be divided among different persons of the community instead of just a single one. Hence, in this way obtaining food resources will become easier.
Final answer:
An individual in the wilderness might hunt, fish, or forage for food, while a community can use agriculture, trade, and specialization to obtain resources. Communities help increase survival rates by sharing knowledge and labor in food production.
Explanation:
a. Humans require clean air, freshwater, food, and shelter to survive. When considering how an individual living alone in the wilderness could obtain food, they might rely on skills such as hunting, fishing, and foraging for wild edibles. Without the aid of others, they would need a comprehensive understanding of their environment and the resources it offers.
b. In contrast, when many people living in a community work together to obtain food, they can employ forms of agriculture, trade, and specialization to secure a diverse range of food resources. Communities can develop systems like farming crops, raising livestock, and creating food distribution networks, which contribute to a more reliable food supply for all members.
c. Living in a community can increase the survival rate of individuals when it comes to obtaining food resources by providing a collective safety net. Collaboration allows for the sharing of knowledge and labor, thereby creating a more efficient system of resource acquisition and distribution.
How did the lab activities help you answer the lesson
question: How are relative and absolute dating methods
used to determine the age of rocks and fossils? What did
you learn from conducting this lab?
Answers
Answer:
The relative method for dating the age of rocks and fossils helps to date the rocks and fossils by determining the approximate age for the fossil or rock by comparing it to something whose age is already known like similar rocks and fossils. In fact, there are certain rocks and fossils which serve as index fossils for comparison.
Absolute dating method tends to determine a precise age of rocks and fossils by radiometric dating of the isotopes of the rocks and fossils.
A known aged rock or fossil is used in the relative dating while radio isotopes are used in absolute dating method.
Relative dating method:
It compares the rock or fossil with similar rocks which age is already known to determine the approximate age for the fossil or rock.
Absolute dating method:
It use the radio element dating to determine a precise age of rocks and fossils .
Therefore, a known aged rock or fossil is used in the relative dating while radio isotopes are used in absolute dating method.
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what characteristics of the circulatory system increase its efficiency?
Answers
Answer:
it has thin long capillaries which allows it to carry blood to all parts of the body
which statement is the best distinction between birds and other animals
birds have amniote eggs
birds can fly
birds have feathers
birds eat seeds
Answers
Answer: C. Birds Have Feathers
Explanation: k12 test / k12 unit test 5.19
( Would someone be able to help me with this question please and thank you). Need Help ASAP. I posted a picture of the question. There are three parts.
Answers
Explanation:
There are three parts
1. bob
The rock which is fixed to the string .
2.point of suspension(s)
The end of the string from where the stone is tied
3.Length of a pendulum(L)
The length between the center of gravity of the stone to the end of the string (point of suspension).
Which of the following best describes telophase stage of mitosis
Answers
Answer AND Explanation:
Once the chromatids reach the poles they become densely packed together and uncoil. These are destined to become the chromosomes of the new daughter cells. The spindle apparatus breaks down and a nuclear membrane is formed around each set of chromatids. Finally, the cell divides forming two daughter cells. The newly formed daughter cells enter interphase and prepare for the next division.
a circle has a circumference of 44 metres what is its area
Answers
Answer: A = 154 m²
Explanation: First solve for radius r
Using circumference formula
C= 2πr
Derive to find r:
r = C / 2π
= 44 m / 2 ( 3.14 )
= 7 m²
Solve for area
A = π r²
= ( 3.14 ) ( 7 m )²
= 154 m²
How are clouds and fog related to precipitation?
Answers
Answer and Explanation:
Both clouds and fog are closely related to precipitation.
This can be explained first by the formation of clouds and fog, which begin when the air contains water vapor. This water vapor is produced when there is an accumulation of moisture in the enviroment which leads to the formation of clouds. A similar process occurs with the formation of fog, which comes from saturation, that occurs after the evaporation and condensation processes that take place after precipitation (water cycle).
Moreover, some types of clouds (cumulonimbus) are associated with precipitation as they could be accompanied by climatic phenomenon such as rain and snow.
Which statements describe sedimentary rock? Check all that apply
It comes from older rocks.
It forms from sediments
It is one of the three main types of rocks.
It comes from materials that never existed before,
It can form from materials solidified from solutions
Answers
The right options are:
It comes from older rocks.
It forms from sediments
It is one of the three main types of rocks.
It can form from materials solidified from solutions
Sedimentary rocks:Sedimentary rocks are formed by the deposition of the small particles and cementation of organic particles on the floor of the oceans or the other bodies of water at the earth's surface.Sedimentary rock is a rock formed underground, usually under a source of water. The rock is made up of smaller rocks that over the years, fused together and solidified.Rock material from pre-existing rocks such as metamorphic and igneous rocks eventually make up sedimentary rocks. Types of sedimentary rocks are; Sandstone, siltstone, shale, breccia, etc. formed from weathering of rocks.Learn more about sedimentary rocks:
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100 POINTS!
Electromagnetic Energy Example Two
Activity:
Type of electromagnetic energy:
Picture:
Description of use:
Answers
Type of electromagnetic energy: Microwave radiation
Description of use: the microwave radiation is absorbed by water molecules in the food which converts to heat intern heats the food do to the high levels of radiation being emitted into the food
Calculate the total magnification of the medium power ocular objective with a 10X magnification.
Answers
Total magnification of the medium power ocular objective with a 10X magnification is 100X
Explanation:
Given: Medium power ocular objective=10X
magnification is 10X
Total magnification= power of ocular objective*magnification
10*10
The magnification of the ocular lens is multiplied with the power of the objective lens. We know that magnification of the objective lens for low, medium and high power are 4X, 10X, and 40X,
Human blood has a pH of 7.4 how do buffers in the blood affect the pH
Answers
Answer:
Human blood has a pH of 7.4 how do buffers in the blood affect the pH?
It is expedient to note that since pH of human blood tends to be at neutral, buffer ensures that the point of neutrality is maintained in order to avoid having a basic or acidic blood. Proteins in the body works as buffer as well to carryout this activity
Explanation:
Which of the following statements best describes the difference between natural selection and evolution? (5 points)
Natural selection changes an individual's traits over time, whereas evolution changes an entire population's traits.
• Natural selection is a process, whereas evolution is what can result from that process.
Natural selection relies on genetic variation, whereas evolution solely relies on mutation and competition
Natural selection refers to the variation in genetic code, whereas evolution refers to the physical changes observed in a species
Answers
Natural selection is a process, whereas evolution is what can result from that process. This best describes the difference between natural selection and evolution.
Explanation:
Natural selection is the process by which the population of individuals survive which have best adapted to the environment by passing on the useful genes to its offsprings.
While Evolution is the result of natural selection where all species who have adapted to the environment and survived and passed on the genes to their offsprings. The individuals compete and survive from their genetic variations.
Answer: B
Explanation: I got 100% on the test
mercury is a pollutant classified as___?
A. a radioactive waste
B. a heavy metal
C. an organic material
D. a pathogen
Answers
Answer: B. a heavy metal.
Explanation:
Mercury is a heavy metal and can be quite toxic if leaked out
Answer:
heavy metal
Explanation:
What are two methods that are used to directly study human chromosomes ???
Answers
Answer: Pedigree and karyotype
Explanation:
What is responsible for moving chromosomes during mitosis.
Answers
Answer:spindle
Explanation:
Spindle is a strand or network that attach itself to the Chromosome and aids its movement during mitosis towards the pole ensuring every daughter cell is comprise one of it parental DNA.
(Fill in the blanks! :) If you fill in both I will mark you brainliest.!!!!!!!!!
1: Wind moves horizontally because of differences in air pressure. These differences in air pressure are a result of ________ heating of earth’s atmosphere from the _____.
2:This pressure moves from an area of _____pressure to an area of_____ pressure, creating the wind.
Answers
Answer:
1. Wind moves horizontally because of differences in air pressure. These differences in air pressure are a result of __differential______ heating of earth’s atmosphere from the _sun____.
2:This pressure moves from an area of __high___pressure to an area of__low___ pressure, creating the wind.
Explanation:
The sun rays ‘hit’ the earth's surface with increased obliquity with increasing latitude. In addition, the density of the sun rays per sq meter also decreases with increasing latitude. This is all due to the spherical nature of the earth.
However, there are also local differences that cause the earth's surface to heat differentially such as terrain and cloud cover, etc. This creates regions of warmer air mass (low-pressure zones) and cooler air mass(high-pressure zones). These differences cause winds because of air rushes from high to low-pressure zones due to differences in air masses’ temperature-related densities.
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In order for transcription of the lac operon genes to take place, what must happen?
The repressor protein binds to the promoter sequence.
The repressor protein binds to the DNA molecule, and RNA polymerase falls off.
The repressor protein falls off the DNA molecule, and RNA polymerase binds to the promoter.
Lactose is removed from the system.
Answers
Answer:
Lactose is removed from the System
In order for transcription of the lac operon genes to take place, the repressor protein falls off the DNA molecule, and RNA polymerase binds to the promoter that is in the third option as the RNA polymerase initiates the lac gene expression.
What is the significance of the Lac gene?The lac gene is present in the bacteria, where there are three genes that activate when there is an abundance of lactose in the bacterial medium, so that the bacteria can take the lactose and break it down into glucose and galactose for growth. Because the inhibitor, in general, inhibits the RNA polymerase's movement along the DNA, when lactose is present, the inhibitor binds to it, allowing the RNA polymerase to continue lac transcription.
Hence, in order for transcription of the lac operon genes to take place, the repressor protein falls off the DNA molecule, and RNA polymerase binds to the promoter that is in the third option as the RNA polymerase initiates the lac gene expression.
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What group is entirely unicellular?
organisms
prokaryotes
fungi
eukaryotes
Answers
Answer:
promaryotes and eukaryotes
The main four factors that weather are: humidity, air pressure, wind and
Answers
Answer:
It could be temperature maybe
Explanation:
A mechanism of evolution that suggests changes in the gene pool of a population are due to chance is
genetie di
natural selecting
gene flow
evolution
Answers
Answer:
Genetic drift
Explanation:
Genetic drift is the change in the frequency in which an allele occurs in a population due to random sampling meaning the alleles in the offspring in a population are a random sample of those in the parents.Genetic drift being an evolutionary process leads to changes in the gene pool of a population over time.
which type of macromolecule is responsible for long term energy storage
Carbohydrates
Proteins
lipids
nucleic acids
Answers
Answer:
Lipids
Explanation:
Lipids, or fats, are the macromolecules responsible for long-term energy storage. They provide more than twice the energy per gram compared to carbohydrates and proteins, making them efficient in providing energy for longer periods of time.
Explanation:The type of macromolecule responsible for long-term energy storage is lipids. Lipids, specifically fats, are significant for long-term energy storage because they deliver more than twice as much energy as carbohydrates or proteins per gram, making it a highly efficient form of stored energy. Examples of lipids include fats, oils, and waxes. Conversely, carbohydrates are typically used for quick energy boosts, proteins for repaid and cellular function, and nucleic acids for genetic information storage.
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In the Linnaean system, birds and reptiles are each classified in a separate class. However, in the modern system, birds are members of the
clade Reptilia. Which conclusion, based on evidence, did scientists cite to revise the classification of birds?
A Birds and reptiles have adaptations for surviving in similar habitats.
B. Birds and reptiles both rely on DNA, RNA, and the universal genetic code..
C. Birds and reptiles share many behavioral traits, such as laying eggs in nests.
D. Birds descended from the most recent common ancestor of reptiles.
Answers
Answer:
The correct option is D) Birds descended from the most recent common ancestor of reptiles.
Explanation:
The modern system of classification is based on the evolutionary history of organisms. The organisms having more common ancestors from the past stand more closely together in the evolutionary tree. The evolutionary history of the birds showed that birds originated from an ancestor which was a reptile in the past. Hence, in the modern system of classification, birds are placed as members of the clade reptiles.
Answer:
d
Explanation:
A _____ is a sequence of 3 nucleotides within mRNA that encodes for a specific amino acid or termination sequence.
Answers
Answer: Codon
Explanation: A codon is a triplet of nucleotides in an mRNA that codes for specific amino acids. There are 64 possible codons. They are called the genetic codes. Three of these codons (UAA, UAG, UGA) do not code any known amino acid and are thus called termination codons. One of the codons (AUG) signals the beginning of translation and is thus called initiation codon.
Answer the question please
Answers
Answer:
cell is the simplest level of organization among them. So the correct one is R
When an atom that has no change loses two electrons, it becomes a ?
Answers
Question: When an atom that has no charge loses two electrons, it becomes a:
A: positive ion.
B: negative ion.
C: positive isotope.
D: negative isotope.
Answer:
When an atom that has no change loses two electrons, it becomes "positive ion".
Explanation:
It is known that electrons hold a negative charge. So, when the negative charge that is electrons are taken out an atom then the number of electrons become less in number as compared to the number of protons. Hence, the atom attains a positive charge.An isotope is formed when an atom shows same number of protons and different number of neutrons. So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form.Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.