Meiosis only occurs in reproductive cells, as the goal is to create haploid gametes that will be used in fertilization. Meiosis is important to, but not the same as, sexual reproduction. Meiosis is necessary for sexual reproduction to occur, as it results in the formation of gametes sperm and eggs.
What creates a positive charge inside the cell during a nerve impulse?
A. Gated sodium channels open and sodium ions flood into the cell.
B. Negatively charged ions leave the cell and make the inside positive.
C. Carbon dioxide molecules break apart and become ions to create an overall positive charge.
D. Across the synapse, positively charged ions of many different elements flow into the cell.
Answer:
a gated sodium channels open and sodium ions flood into the cell
What is an oosphere in relation to biology
Answer:
oosphere (ovum; egg cell) The nonmotile female gamete in plants and some algae. Explanation:
Es verda que Las plantas de semilla se dividen en dos grupos de acuerdo con el lugar donde se desarrolla la semilla, en angiospermas y gimnospermas
Answer:
No.
Explicación:
No, las plantas de semilla no se dividen en dos grupos según el lugar donde se desarrolla la semilla en angiospermas y gimnospermas. Se dividen en dos grupos sobre la base de semillas desnudas y semillas cerradas. En las angiospermas, las plantas son plantas con flores que llevan sus semillas cerradas dentro de los frutos mientras que en cambio, en las gimnospermas son plantas que no producen flores y llevan conos y semillas.
An axon is a. a layer of fatty tissue that encases the fibers of many neurons. b. the extension of a neuron that carries messages away from the cell body. c. a molecule that blocks neurotransmitter receptor sites. d. a cell that serves as the basic building block of the nervous system.
Answer:
option b the extension of a neuron that carries messages away from the cell body
A strain of Neisseria gonorrhea has a mutation which has caused it to lose the ability to produce fimbriae and become less virulent as a consequence. What function has this pathogen lost
Answer: The pathogen has lost the function of the ability to adhere to cells of the body.
Explanation:
Neisseria gonorrhea is a gram negative bacteria that has the ability to attack and cause disease in man using its virulent factors. It is know to attack the urethra of both male and female producing an acute urethritis and tenda to spread locally if not treated. The virulent factors determines the ability of the organism to infect or damage it's hosts tissues and they include:
--> endotoxins
--> pilli
--> fimbriae
--> capsule polysaccharide expression
The fimbriae is one of the virulent determinants which the organism uses to attach to the host cells. As these bacteria multiple and grow, there are chances of mutation occuring. MUTATION is defined as the errors during DNA replication or induced by exposure to mutagens (like chemicals and radiation)
If the bacteria is affected by mutation, which can cause the gene for fimbriae production not to be expressed, the virulent factor of the organism will be highly affected as the first step to cause an Infection which is attachment is lost.
Rock that erodes to expose layering is _____
O A. igneous O B. granitic O C. sedimentary O D. metamorphic
Answer:
sedimentary rock
Explanation:
Which of the following is not a source of genetic variation?
A
sexual reproduction
B
asexual reproduction
C
mutations
D
crossing over during meiosis I
describe this process for VEGETATIVE PROPOGATION
Answer:
hsbshueueueueheheheheheh
what is respiration ? how does it occur ?
Explanation:
Respiration is the process of releasing energy through the breakdown of nutrients such as glucose. Respiration can be aerobic (uses oxygen) or anaerobic (does not use oxygen). Aerobic respiration takes place continuously in both plants and animals. It occurs through a process known as cellular respiration.
Forensic biologists are testing a DNA sample that has no match found in the system using SNP analysis. What helpful information could the biologists get from the SNP?
The sample was taken from someone with brown hair and blue eyes.
The sample was taken from an animal.
The sample was taken from an elderly person.
The sample was contaminated during collection.
Answer:
Option D
Explanation:
The SNP analysis is useful in determining response of an individual towards a drug and its environmental susceptibility. Thus, the SNP analysis in this case will give an indication of whether the sample was contaminated or not.
Hence, option D is correct
What is the purpose of a dichotomous key?
А
to locate an organism
B
to identify an organism
С
to divide a kingdom
D
to interbreed species
Answer:
B. to identify an organism
Explanation:
-
↬Define a Cell in Biology.
The cell is the basic structural, functional, and biological unit of all living organisms.
The structural and essential component of life is the cell. Cell biology is the study of cells, including their fundamental makeup and the purposes of each of their organelles.
The first biologist to discover cells was Robert Hooke. Cells make up every living thing. They could consist of several cells (multicellular) or just one cell (unicellular) (multicellular).
The tiniest cells known to science are mycoplasmas. All living things are constructed from cells. They give the body structure and turn the nutrients from the diet into energy.
Complex cells conduct a variety of tasks for an organism's parts. They resemble masonry bricks in that they come in a variety of sizes and forms.
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an element that can bioaccumulate in lead to biomagnification is ____
a. hydrogen
b. oxygen
c. argon
d. Mercury
An element that can bioaccumulate in lead to biomagnification is Mercury.
What is biomagnification?"Biomagnification is defined as the accumulation of a particular (toxic) substance in the body of the organisms at different trophic levels of a food chain."The accumulated substance increases at each tropic level as we move from lower to top level.Examples of toxic substance: Mercury, arsenic, DDT.
Hence, the correct option is d. Mercury.
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The factory district is planning on expanding. Which solution would Not minimize the impact?
A. Conservation easement between the farms and factories
B. Higher city taxes and lower suburban taxes
C. development permits specifying where the factory district could expand and fees for expansion
D. Zoning regulations and wetland areas
Answer:
higher city taxes and lower suburban taxes
Explanation:
Solution would not minimize the impact is Higher city taxes and lower suburban taxes.
Collecting taxes will not have any impact on maintaining sustainability.People if cities are more employed than the suburban ones and that’s the reason for variation in taxes not the expanding of the factories.What is sustainability?It is the responsibility to conserve nature and protect the ecosystem to support the health and wellbeing , now and in the future.It is used to indicate programs , initiatives aimed at the preservation of particular resource which might get extinct in the future.To know more about sustainability here
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WILL MAKR BRAINLIST HELP
Plants play a crucial role in the carbon cycle because they
a. Do not release carbon dioxide during cellular respiration
b. Take in carbon from an ecosystem during photosynthesis
c. Breakdown glucose during photosynthesis
d. Have special bacteria that live in their roots
Answer:
B
Explanation:
They keep the carbon content in check and enable carbon cycle to continue on.
Which option identifies a consequence of the following scenario?
Tandy makes her own goat feed, but she finds it difficult to balance the correct ratio of vitamins and minerals.
parasites
gout
infertility
bloat
Answer:
blout
Explanation:
odysse yware
The four cells produced in meiosis will have a:
a. 2n number of chromosomes and will differ genetically from each other.
b. 2n number of chromosomes and will be genetically identical to each other.
c.an number of chromosomes and will be genetically identical to each other.
d. n number of chromosomes and will differ genetically from each other.
Answer:
Here is your answer.. hope it helps u have a great day ahead
Two heterozygous pomeranians have a litter of puppies. Orange fur (L) is dominant over white fur (l). What percent of the puppies could have white fur?
When water reaches the ground, most of the water ends up where?
Oceans
on grassland
rivers or streams
Answer:
id say rivers or sreams, i dont really know, i guess it really depends where it rains. if it rains over the ocean then all of it is going there
Explanation:
beeg brain power...or i could be wrong and have smol brain power
As cattle, horses, and other livestock graze in a field, their movements stir up various insects. As the insects are stirred up, egrets follow the livestock to catch and eat the insects, leaving the livestock unaffected. Which of the following best describes the relationship between the egrets and the livestock?
Parasitism
Commensalism
Competition
Mutualism
Answer:
Commensalism
Explanation:
Commensalism means that two species interact; one of them benefits from the other while that other one is neither benefited nor harmed. This explains the relationship between the livestock and egrets.
Hope this helps :)
7. How does your respiratory and circulatory systems attempt to maintain homeostasis
during exercise?
a. Your body produces more red blood cells to help provide energy to cells.
b. Your lungs produce more oxygen which is then delivered to the cells through the
blood.
c. You experience an increase in blood flow which provides nutrients to cells to
increase energy and remove wastes.
d. You experience an increase in breathing rate to obtain more oxygen which is
delivered to cells through the bloodstream.
Answer:a
Explanation:
Much of our world is made up of plants, soil, and water. What do you think is
important about these three things? How do they interrelate?
Plants, soil, and water are interrelated to one another and help humans to sustain themselves on the earth's surface.
What do you mean by Soil?Soil may be defined as the loose surface material that covers most land. It consists of inorganic particles and organic matter.
Water makes the soil moisturized which increases its fertility. When soil becomes fertile, the number of plants grows which directly absorbs water through the xylem and mediates the process of photosynthesis. In this way, all plants, soil, and water are connected to one another.
Therefore, Plants, soil, and water are interrelated to one another and help humans to sustain themselves on the earth's surface.
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what are Okazaki fragments
Answer:
Okazaki fragments are short sequence of DNA nucleotides.
What causes the plates in Earth's crust to move?
0 Ocean currents
O Solar energy
Convection cells
O Sea floor spreading
a certain species of butterflies gradually becomes darker. the birde in the same area feed on the white or lightly colored buterflies, ;eaving tuterflies that are dar colore. what type of selection
Answer:
Natural selection.
Explanation:
The dark colour butterflies will increase in their population due to favourable conditions of the surrounding environment. They are naturally selected by the nature due to their suitability and compatibility with the environment that allows dark butterflies to increase in their population. The colour of dark butterflies helps them to not eaten by the predators that allows them to increase in their population so we can say that this type of selection is natural selection.
Which of the following would be responsible for protecting an endangered butterfly from extinction?
geologist
Omnithologist
entomologist
mammologist
Answer: entomologist
Explanation: Entomologist because him/her is a person who studies or is an expert in the branch of zoology concerned with insects.
Differentiation of cells has an important role in the cell division of complex organisms. What would happen without this differentiation of cells?
Explanation:
sana po nakatulong sainyo thanks❤
Cells are the basis of the survival of human beings. We, the living organisms are made up of cells. If cells won’t divide no new organisms would originate.
What is cell division?
Cell division is the process by which a parent cell divides, when a mother cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle. Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells. During cell division, mitosis refers specifically to the separation of the duplicated genetic material carried in the nucleus.
The existing cells will die and no new cells will be produced as there is no cell division.
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HELP!
Which of the following would help clouds form?
a. Air flows down the eastern slope of the Rockies near Browning.
b. Air on a barren mountain slope gets hot and begins to rise.
I would say b, because the water molecules would go up in to the atmosphere and become a cloud.
PLEASE HELP BIOLOGY!! WILL GIVE BRAIN!!
Answer:
True
Explanation:
have a great day
Explanation:
If someone has blood type A, they must have at least one copy of the A allele, but they could have two copies. Their genotype is either AA or AO. Similarly, someone who is blood type B could have a genotype of either BB or BO. A blood test of either type AB or type O is more informative.
Physics
Solve this
And also tell what is 1dm3
Explanation:
1 dm3 is a cube with dimension 1 deci meter
One cubic decimeter is the unit of volume which is exactly equal to one litre.
What is meant by volume ?Volume of an object is defined as the amount of space within the object which the matter can be occupied.
Here,
It is said that volume is a derived quantity.
Volume is said to be a derived quantity because, volume is the product of length, breadth and height of a three-dimensional shape.
It is given that,
1 L = 1000 mL
1 L = 1 dm³
1L = (10cm)³ = 1000 cm³
We know that, 1 cm = 10⁻²m
So, we can write that,
1L = 1000 x (10⁻²m)³
1L = 10³ x 10⁻⁶m³
Therefore,
1L = 10⁻³ m³
Or
1 m³ = 1000 L
1 dm³ or 1 cubic decimeter is the unit of volume, which is equal to one litre.
Hence,
One cubic decimeter is the unit of volume which is exactly equal to one litre.
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