why are the male testes located in the scrotum outside the body?
Final answer:
The male testes are located in the scrotum outside the body to ensure a cooler temperature necessary for effective sperm production. The scrotum regulates this temperature through its position and muscle contractions, optimizing conditions for spermatogenesis. Incorrect temperature can lead to infertility, highlighting the importance of the testes' external positioning.
Explanation:
The male testes are located in the scrotum outside the body to maintain a temperature that is conducive to sperm production. Sperm are known to be immobile at the core body temperature, which makes it essential for the testes to be situated in an environment that is approximately 2 degrees Celsius cooler than the body's internal temperature. This cooler temperature is necessary for spermatogenesis, the process of sperm production, to occur effectively.
The scrotum, a sac of skin located between the upper thighs, plays a critical role in regulating this temperature. It does so by adjusting its position relative to the body: contracting to pull closer to the body for warmth when too cold, and relaxing to move away from the body to cool down when necessary. Such temperature regulation is vital as it can impact fertility - with infertility being a consequence in land mammals when the testes do not properly descend during fetal development.
Additionally, the scrotum is equipped with smooth muscles that help in this temperature regulation by contracting or relaxing as needed. This precise temperature control in the scrotal environment optimizes conditions for spermatogenesis and ensures the stability of reproductive cells, underlining the critical reason why the testes are external to the body.
Compare the properties of the parent and daughter cells in mitosis and meiosis and explain the reason for any differences. it needs to be simple and short
Haploid cells are
A) mutated cells with missing chromosomes.
B) fused cells with double the chromosome number.
C) sex cells with half the original chromosome number.
D) sex cells with the original chromosome number as the parent cell.
Answer: The correct option is -
C) sex cells with half the original chromosome number.
Explanation:
Sex cells are the reproductive cells, which are also known as gametes (such as eggs and sperms) and are produced through meiosis.
Meiosis is a type of cell division that occurs during gamete formation, specifically in sexually reproducing organisms.
It is also called reductional division as it produces haploid sex cells, which possess half the number of original chromosomes.
Thus, option C) is the right answer.
How is a cell set off as a separate unit from it's environment?
The structure of the cells reveal the presence of the fluid called cytosol or cytoplasm separated by a membrane known as cell membrane or plasma membrane.
The cytoplasm have a different environment as compared to outside. The different environment inside the cell is maintained by the presence of the plasma membrane, the plasma membrane does not allow the mixing of inside and outside environment of the cell, hence, maintain the different environment.
At the same time the plasma membrane is semipermeable and allow few molecules to pass in the cell, in order to support the proper functioning of the cell.
For the common ancestor of all the Bilateria, what was the fate of the blastopore?
For the common ancestor of all the Bilateria, what was the fate of the blastopore?
neither (N)
deuterostomy (D)
protostomy (P)
It is impossible to tell from the data provided.
Answer;
It is impossible to tell from the data provided.
Explanation;
Different animals can be categorized as either protostomes and deuterostomes based on certain features of their embryonic developments.
For those categorized as protostome; the features include; mouth from blastopore, spiral,determinate cleavage, and coelom from solid masses of mesoderm
Those categorized as deuterostome have features such as coelom from folds of archenteron, radial, indeterminate cleavage, and anus from blastopore.
moving your jaw forward causing an underbite is called
Moving your jaw forward causing an underbite is called protraction.
What is protraction?
The group of bones in your jaw is where your teeth are held. There are two key components to it. The maxilla is the upper portion. It is stationary.
Chin is where the mandible's two halves come together. The temporomandibular joint is the point at which your mandible and skull converge.
Any opposable articulated structure at the mouth's opening is referred to as a jaw, and it is often utilized to grab and manipulate food. The term "jaws" is often used widely to refer to the entire group of structures that make up the vault of the mouth and function to open and close it.
Therefore, Moving your jaw forward causing an underbite is called protraction.
To learn more about Jaw, refer to the link:
https://brainly.com/question/12977402
#SPJ5
Using at least three sentences, explain the cycling of energy through the processes of photosynthesis and cellular respiration.
Two heterozygous purple-flowering pea plants are crossed. If purple is dominant over white, what are the expected phenotypic results?
75% purple, 25% white.Doing the Punnett square will show that 1/4 will be PP and 1/2 will be Pp, so 75% will be purple. The last 25% (pp) will be white.
Why are coastal mountains in a straight line?
Decomposition in pools, ponds, and lakes takes place mostly in the _______ zone. a. pelagic
b. littoral
c. benthic
d. all of the above
Decomposition in pools, ponds, and lakes takes place mostly in the benthic zone.
The benthic zone is the region at the lowest part of water bodies such as lake, stream or ocean which include the floor, the sediment surface and some sub-surface layers. Decomposition mostly occurs in the benthic zone. The benthic zone contains mainly aquatic macro-invertebrates (benthos) such as insects, worms, beetles, clams, and mites which breakdown organic matter that are suspended in the water.
Which structure,composed mainly of proteins and lipids, aids in maintanining homeostasis in a cell?
Why is water essential to life on a chemical level?
The first amino acid inserted into a new polypeptide chain in eukaryotic cells is always _____.
which of the following organelles can be best be compared to a conveyer belt
A. ribosomes
B. golgi apparatus
C. nuclear envelope
D. E.R
what is the purpose of ovulation
describe the process of translation ...?
Translation is the process by which the information now on the RNA molecule is used to make a new polypeptide chain
a. The mRNA strand binds on to a ribosome at the end with the 'start' condon AUG. A tRNA carrying the amino acid methionine at one end and the anticodon UAC at the other, binds to the 'start' condon on the mRNA within the ribosome.
A second tRNA binds to the next condon. Its amino acid links with a peptide bond to the first amino acid.
b. The first tRNA is released from the ribosome. The ribosome moves along the mRNA strand one condon at a time. Two tRNAs at a time are temporarily bound within the ribosome and their amino acids linked together. A polypeptide chain forms
c. When a 'stop' condon is reached the polypeptide chain is released into the cytoplasm.
d. A polypeptide chain is only the primary structure of a protein. Each protein has a particular conformation or shape formed by the twisting or folding of its polypeptide chains
Proteins are vital components of a cell. If the DNA sequences are changed by mutation, protein production will change. If no protein or a different is made then a cell's structure or activites may also change. In this way any variation in the genetic material will be expressed by the cell. Variation shown by an organism is the basis on which natural selection can act.
Translation is a process in Biology where mRNA's information is used to create a protein. The mRNA binds to a ribosome, tRNAs bring the corresponding amino acids, and a polypeptide chain is formed. It halts when it reaches a 'stop' codon.
Explanation:Translation is a biological process by which information coded in mRNA is used to synthesize a protein. It involves three primary steps:
The mRNA strand binds to a ribosome starting at the 'start' codon AUG. An tRNA carrying the amino acid methionine with an anticodon UAC pair up with the 'start' codon on the mRNA within the ribosome. A second tRNA then binds to the next codon and links its amino acid to the first, forming a peptide bond.The first tRNA is released while the ribosome moves along the mRNA string. Two tRNAs temporarily bind to the ribosome, resulting in the linkage of their corresponding amino acids and forming a polypeptide chain.Upon reaching a 'stop' codon, the production ceases and the newly formed polypeptide chain is released into the cytoplasm.It's important to note that the polypeptide chain formed is the primary structure of the protein. If any mutation occurs in the DNA sequence, it affects the protein production, therefore, changing the cell's structure.
Learn more about Translation here:https://brainly.com/question/23277238
#SPJ6
Which animal has gills for respiration?
A.
salmon
B.
frog
C.
grasshopper
D.
robin
Your answer is A. salmon. Fish do not have gills and salmon are fish
What is the purpose of the dense hairs around the flowers of the woolly lousewort?
a.
The dense hairs keep moisture off the flower.
b.
The dense hairs trap heat from the sun.
c.
The dense hairs protect the flower from caribou.
d.
The dense hairs keep the flower’s seeds from blowing away.
The energy of the electrons passing along the electron transport chain is directly used to???
Answer:
Option D
Explanation:
Please see the attachment
What is the most common term used in genetics to describe the observable physical characteristics of an organism caused by the expression of a gene or set of
genes?
Plz Halp
Anything that has mass takes up whose particles are in constant motion
Which of the following best summarizes the function of the respiratory system?
A. to transport oxygen to cells and wastes away from cells.
B. to protect the organs in the chest cavity C. to move oxygen from the air into the body and carbon dioxide from the body into the air
D. to provide a barrier between the body and the environment
C** Which of the following is not true about the structure of an alveolus?
A. it has thick walls to trap gases that enter during breathing.
B. it has high surface area to allow lots of gas exchange.
C. it has a high concentration of oxygen and a low concentration of carbon dioxide.
A**
which of the following organisms do not have cell walls
The only haploid cells in an organism are _____.
a.parent cells
b.gametes
c.homologous
Answer:
Gametes.
Explanation:
The haploid cells contains the single set of chromosomes as compared with diploid cells. Haploid cells are mainly produced by the process of meiosis.
The haploid cells in an organism includes the gametes. The gametes cells are produced by the process of meiosis. These gamete cells contains the half number of chromosomes as parent cell.
Thus, the correct answer is option (b).
Protocells are capable of ____________________.
a.
fermentation
c.
respiration
b.
photosynthesis
d.
growth and division
Answer:
The correct answer is option d.
growth and division
Explanation:
Hello!
Let's solve this!
The protocell are cells that were created before the cells as we know them today. They are structures that include organic polymers. They are also self-replicating, this means that they can grow and divide.
We conclude that the correct answer is option d.
growth and division
Reynaldo is reviewing a study on the effectiveness of a new drug-free remedy for depression. In the study, a group of participants was given a natural supplement for a period of six weeks. They rated their mood both before and after treatment. Two-thirds of the group reported a marked improvement after the trial. What change in this study would do the most to increase Reynaldo's confidence that sound scientific practices were followed? ...?
Answer:
Including the control group that did not receive the supplement.
Explanation:
Without this information we wouldn't know if his experiment was correct or not. Hope This Helps:)
Final answer:
To increase confidence in the study’s results, a control group receiving a placebo should be included, and participants should be randomly assigned to either the supplement group or the placebo group to rule out placebo effects.
Explanation:
Reynaldo is reviewing a study on the effectiveness of a new, drug-free remedy for depression. To increase confidence that sound scientific practices were followed in the study, one significant change that could be made is the inclusion of a control group that receives a placebo. By comparing the group that gets the natural supplement with a control group that receives an inert substance, researchers can ascertain whether the improvements are due to the supplement itself or to placebo effects. Setting up the study in such a way each participant would have an equal chance of being in either group, which is known as random assignment, can further enhance the validity of the study. This design helps rule out the possibility that improvements are due merely to the participants' belief they are receiving an effective treatment.
. Panthalassa was ______.
the supercontinent that formed before Pangaea
one of the continents that formed from Pangaea
the large ocean that surrounded Pangaea
a body of water cut into the eastern edge of Pangaea
Which of the following would not help an animal live in the desert?
1.Having thin, moist skin – skin constantly covered in a film of water
2.Estivation – burrow underground and wait for agreeable conditions
3.Hygroscopic skin – absorb water through the skin
4.Being nocturnal – active during the night
Microtubules, microfilaments, and intermediate filaments make up the _____, which lies beneath the plasma membrane and provides support, movement, and shape for the cell.
A) cell wall
B) cytoplasm
C) cytoskeleton
D) Golgi complex
Answer:
Option C, Cytoskeleton
Explanation:
Cytoskeleton is made up of following structure -
a) Microtubules - it is the largest part and help in organelle transport
b) Actin filaments
c) Intermediate filaments
d) and several proteins to support this system
These three components give shape to the cell and also keep all the internal parts of the cell intact.
They also support cell in movement
Cytoskeleton play a supportive role in cell division as well
Hence, option C is correct
describe the benefits to using tissue cultures to study medications used for treating cancer cells
The correct answer is:
Medications can be tested on cell cultures instead of being injected into patients unnecessarily. Cancer cells continue to grow in the cultures uncontrollably allowing scientists to test multiple medications on the cancer cells. Specific treatments that are shown to fight the growth of cancer cells in the culture can be used on patients. Cultures are safer to use than injections of unneeded medications into patients.
I’m sure that’s right. Hope it helps!