Answer:
The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus. The sperm nucleus (1) loses its nuclear envelope, (2) undergoes nucleoprotein remodeling, (3) decondenses and increases in size, (4) becomes more spherical, (5) acquires a new nuclear envelope, and (6) becomes functionally competent to synthesize DNA and RNA. These changes are coordinate with meiotic processing of the maternal chromatin, and often result in behaviors asynchronous with the maternal chromatin. For example, in eggs fertilized during meiosis, the sperm nucleus decondenses while the maternal chromatin remains condensed. A model is presented that suggests some reasons why this puzzling behavior exists. Defects in any of the processes attending male pronuclear development often result in infertility. New assisted reproductive technologies have been developed that ensure delivery of the sperm nucleus to the egg cytoplasm so that a healthy embryo is produced. An emerging challenge is to further characterize the molecular mechanisms that control sperm nuclear transformations and link these to causes of human infertility. Further understanding of this basic process promises to revolutionize our understanding of the mystery of the beginning of new life.
Explanation:
The delivery of the paternal genome to the egg is a primary goal of fertilization. In preparation for this step, the nucleus of the developing spermatozoon undergoes extensive morphological and biochemical transformations during spermatogenesis to yield a tightly compacted sperm nucleus. These modifications are essentially reversed during fertilization. As a result, the incorporated sperm nucleus undergoes many steps in the egg cytoplasm as it develops into a male pronucleus.
1) Base your answer on the information and data table below and on your knowledge of biology.
A student wanted to investigate the effect of light on the rate of ripening of tomatoes. She set up four pots of the same size with identical amounts of soil, water, and type of tomato plants. Each plant was exposed to a different intensity of light as shown in the table below.
The independent variable in this experiment is the
A)
light intensity
B)
amount of soil provided
C)
type of tomato plant
D)
color of tomatoes
Answer:
A) intensity of light
Explanation:
The independent variable is the thing being changed. A dependent variable is the effect caused by that change
9. What are two ways in which cells use the energy provided by ATP?
a.
b.
what occurs if a cell is damaged beyond repair?
Answer:
Apoptosis
Explanation:
Answer:
Apoptosis is programmed cell death, and it usually occurs when the DNA of the cell is damaged beyond repair. Photosynthesis and glycolysis are normal metabolic processes of the cell, and would not result from irreversible damage.
Explanation:
hope this helps
What is an evolution in general?
Answer: A evolution is a process in which someone/something upgrades over the course of time. It usually leads to improvement in lifestyle of that species/thing.
Explanation:
What happens to the cell’s genetic information during the cell cycle?
Answer:I think During most of a cell's life cycle, DNA, along with proteins, is a mass of loose strands called chromatin (KROH-muh-tin). Before cell divion, DNA is duplicated, or copied. Then, in an early stage of cell division, the chromatin is compacted into visible structures called chromosomes (KROH-muh-sohmz).Mitosis is used to produce daughter cells that are genetically identical to the parent cells. The cell copies - or 'replicates' - its chromosomes, and then splits the copied chromosomes equally to make sure that each daughter cell has a full set.During interphase, the cell obtains nutrients, and duplicates (copies) its chromatids (genetic material). The genetic material or chromatids are located in the nucleus of the cell and are made of the molecule DNA. hope this helps have a nice night ❤️❤️❤️
Explanation:
Answer:Mitosis is used to produce daughter cells that are genetically identical to the parent cells. The cell copies - or 'replicates' - its chromosomes, and then splits the copied chromosomes equally to make sure that each daughter cell has a full set. And because During most of a cell's life cycle, DNA, along with proteins, is a mass of loose strands called chromatin (KROH-muh-tin). Before cell divion, DNA is duplicated, or copied. Then, in an early stage of cell division, the chromatin is compacted into visible structures called chromosomes (KROH-muh-sohmz).
Explanation:
PLEASE ANSWER! Will give brainliest! ❤️
Answer:
you are right
Explanation:
HELP MEEEE PLS Hydroelectric power is produced using the energy of moving water.
Which description tells how this process is accomplished?
A Water flowing upstream is help in a reservoir behind a dam. The water moves up through channels in the dam where it flows past turbines, moving them and creating electricity.
B Water flowing upstream moves through a channel in a dam. The water moves though a generator that produces electricity, and then it moves to a reservoir.
C Water flowing downstream is held up in a reservoir behind a dam. Some water moves down channels through turbines connected to generators which produce electricity.
D Water flowing downstream moves through a reservoir in a dam and past turbines. It then moves through channels and cause a generator to produce electricity.
Answer:
C Water flowing downstream is held up in a reservoir behind a dam. Some water moves down channels through turbines connected to generators which produce electricity
Explanation:
Good explanation.
Answer: hi
Explanation:
1. Marine snow refers to
A Appearance of the water during freezing weather.
B. animal and plant plankton that die and drift downward.
C. white sand beaches that form on ocean coasts.
D. algai blooms that form on the surface of a body of water.
E. weather over the Arctic that contributes to the ce pack
Answer:
B. animal and plant plankton that die and drift downward.
The diagram shows a certain type of mutation.
What type of mutation is shown in the diagram?
What is the definition of cellular respiration?
Answer:
Cellular respiration is the process by which organisms use oxygen to break down food molecules to get chemical energy for cell functions.
Explanation: have a nice day
What have scientists realized over the years of how temperature affects humans? Does temperature affect climate change? If it does, how can it be reduced?
HELP!!!
Answer:
Temperature affects humans in many different ways.
Explanation:
Humans can be affected by temperatures because high temperature often can cause health problems, people may feel: Increased irritability. Loss of concentration and ability to do mental tasks. Also temperature doesn't really affect climate change, its more like the other way around. Thing you can do to reduce climate change are use renewable energy, and don't use cars if you don't have to. Because the gas that comes out of the cars turns into green house gas which is the cause of climate change.
n Which of the following correctly describe ozone gas? Check all that are true. protects the Earth from UV radiation Filt a particulate pollutant in the atmosphere healthy to breathe a gas produced by chlorofluorocarbons - O a gas made of three oxygen molecules
Answer:
yes
Explanation:
that is true, but i do not understand the question?
please helpme on time limit and explain
Answer:
Net force is 100 N
Explanation:
You will use the formula to find the net force/force.
mass = 0.05 kg
acceleration = 2000 m/s^2
F = m × a
F = 0.05 kg × 2000 m/s^2
F = 100 N (Newtons)
Hope this helps, thank you !!
Blological evolution is the process by which populations of organisms change over time. How could natural selection lead to evolution?
Answer:
Natural selection is the process of nature selecting the fittest animals to survive and/or thrive, making the weaker ones die out. Over time, the animals with the stronger traits will evolve and adapt to its needs.
Explanation:
Im not sure what the answer is
(brainliest to the right answer)
What is the function of the DNA template?
It is the noncoding strand used to synthesize a complementary mRNA molecule.
It is the noncoding strand used to synthesize a parallel sequence of nucleotides.
It is the coding strand used to synthesize an identical mRNA molecule.
It is the coding strand used to synthesize the transcription unit.
Answer: A. It is the noncoding strand used to synthesize a complementary mRNA molecule.
Explanation:
Just took the test.
The alleles are listed in order of their dominance. The R allele is dominant to r", nch, and r.
The rh allele is dominant to pch and r. The rich allele is dominant to r.
a. Gina has a rabbit with the genotype rr. Identify the phenotype of Gina's rabbit.
Answer:
she has a rabbit with alleles rhr not rr
so would be the himalayan as rh is dominant
if it was rr as you say (not what the question reads if I am reading it right) then her rabbit would be white fur only
Explanation:
pls help. due today. answer ASAP
how will environmental and genetic factors affect the growth of a squirrel?
Answer: A genetic mutation causes a squirrel to be born with much darker fur
Explanation:
please help y'all 15 pts!
Both the liver and kidneys are organs of the excretory system. How do the two organs work together to complete a task?
Answer:
When the liver has broken down due to harmful substances, its by-products are exerted into the bile or blood. Bile by-products enter the intestines and leave your body in the form of feces. Blood by-products are filtered out through the kidneys and leave the body in the form of urine.
Explanation:
When the liver is damaged by harmful substances, their by-products move into the bile or blood, where the by-products of bile enter the intestines and leave your body as feces and by-products of the blood. -products are filtered through the Kidneys and leave the body as urine.
What is Excretion?Excretion is defined as the process in which metabolic waste is eliminated from an organism, this is done by the lungs, kidneys and skin in vertebrates.
This is in contrast to secretion, where matter may have specific functions after leaving the cell where excretion is an essential process in all forms of life.
Through excretion organisms control osmotic pressure which is defined as the the balance between inorganic ions and water and maintain acid-base balance.
Thus, when the liver is damaged by harmful substances, their by-products move into the bile or blood.
Learn more about Excretion, here:
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1. This organelle exists in two forms: Rough and smooth and acts as the transport system for the
cell.*
Why do traits that give an organism a disadvantage exist during meiosis? Please be as descriptive as possible and write it in your own words
Answer:
Meiosis is important because during sexual reproduction, it ensures that all produced organisms have the correct number of chromosomes. It is also responsible for producing genetic variations during the process of recombination, and it repairs some genetic defects.
The disadvantage from not having the trait normally arises only after the reproductive stage of the individual's lifecycle is mostly over. This is a special case of "no strong pressure", because evolution selects genes, not the organism. In other words the beneficial mutation does not alter the reproductive fitness.
Explanation:
Meiosis is important because during sexual reproduction, it ensures that all produced organisms have the correct number of chromosomes. It is also responsible for producing genetic variations during the process of recombination, and it repairs some genetic defects.
What does foliated mean?
a) Sediment
b) Layered
c) Not layered
d) Magma
Answer:
Sediment
Explanation:
hope you like itWhat process is the driving force behind evolution?
Answer:
Mutations and natural selection are the main ones
Explanation:
The process that is the driving force of evolution is natural selection, as natural selection is the phenomenon that explains that nature selects organisms over time to survive in ecosystems.
What is the significance of natural selection over time?Natural selection is important for the survival of organisms as it is a process by which populations of organisms change over time in response to the outer environment. It is also an important evolutionary mechanism because natural selection always chooses the fittest and natural selection also drives the development of new species and helps ensure the survival of existing species.
Hence, the process that is the driving force of evolution is natural selection, as natural selection is the phenomenon that explains that nature selects organisms over time to survive in ecosystems.
Learn more about the process of natural selection here.
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Which of the following greenhouse gases is the focus of current public discussion?
Answer choices
A ) Carbon Dioxide
B ) Methane
C ) Water Vapor
D ) Sulfur Hexafluoride
Answer:
a
Explanation:
bcoz op da grabiti of the earth
A student wants to find the benefit of a certain structural trait in mice. What is the first step the student should follow?
A. Design a classroom experiment.
B. Generate a graph of the results of this experiment.
C. Breed me with and without the trait together.
D. Observe the survival rate of mice with the trait in nature.
Help ASAP please
The answer is A. Design a classroom experiment as a first setup starts with an experiment.
Design of experiments, also known as randomized experiments, is characterized by two distinctive features: (i) the deliberate manipulation of treatment, or more generally, the independent variables of interest to the researcher, and (ii). Random assignment of units to treatment and control groups.
What is a mice trait experiment?Studies in mice allow mothers to pass traits to their offspring via bacterial DNA. Summary: A new study in mice has shown that the DNA of bacteria inhabiting the body can pass traits to offspring in a manner similar to that of the parents themselves.
Hence concluded that mice trait is to be performed first.
To know more about the mice experiment refer to the link :
https://brainly.com/question/3645462
my question is how to adopt a turtle without ur grandma knowing
Answer:
that's probably impossible unless your grandma doesn't go into your room? hide it there lol or anywhere your grandma doesn't go
The tiny structures that are made INSIDE of a cell and connect to create
our traits are called
*
Answer:
Genes
Explanation:
Hereditary information is found in a cell's
A.
chloroplasts
B.
chromosomes
C.
cytoplasm
D.
membranes
is partially enclosed body of water where seawater mixes with fresh watert
A(n)
form a river.
A. benthic zone
B. littoral zone
C. sea
D. estuary
E. coral reef
Answer:
option d estuary because estuary is enclosed coastal water body where fresh and salt water
mix
Answer:
The answer is D, estuary
Explanation:
It is the opening of a river, where it first meets the stream