Answer:
Explanation:
This is because meoisis division occurs in gamates which are sperm cell and egg cell . And in meoisis division the number of chromosomes for the daughter cells is half the number of chromosomes that the parent cell have. This is because when there is a fussion of male and female sex cells ,the zygote which is the daughter cell should have the 46 chromosomes which is the normal chromosomes for humans and when this chromosomes are in pairs then they should be in 23 pairs of chromosomes which are haploid and later be used for another cycle when the person matures and ready to reproduce
Gametes such as sperm and eggs contain half the number of chromosomes as body cells to ensure that upon fertilization, the resulting zygote has the correct number of chromosomes.
Body cells, also known as somatic cells, are diploid, which means they have two sets of chromosomes - one from each parent, totaling 46 chromosomes in humans. On the other hand, gametes, which are reproductive cells like sperm and eggs, contain half the number of chromosomes, or 23 in humans. This is because they are produced through a special type of cell division called meiosis.
During meiosis, the chromosome number is reduced by half to ensure that when two gametes merge at fertilization, the resulting zygote will have the correct number of chromosomes. Each parent contributes one set of chromosomes, so the zygote is equipped with a complete set, maintaining the species' chromosome number. This process not only allows for sexual reproduction but also introduces genetic variation, which is vital for the viability and evolution of a species.
It is important to correct the misconception that body cells are called gametes. In fact, the body cells, or somatic cells, have double the chromosomes found in gametes. Gametes are specifically designed to contain half so that normal diploidy is restored upon fertilization.
Which unit is used for measuring atomic mass?
A.
atomic mole
B.
grams/mole
C.
grams
D.
atomic mass unit
E.
atomic mass weight
Answer:
D. atomic mass unit
Explanation:
The atomic mass unit is used for measuring atomic mass.
ANSWER:
The correct option is D: Atomic Mass Unit. Atomic mass is the "mass of an atom" of elements which is measured in amu or atomic mass unit.
EXPLANATION:
The atomic mass is found to be equivalent to the "number of protons and neutrons" in an atom which is also the "mass number" of an atom. The atomic mass is known as atomic weight which is equal to the "weighted average" of "isotopes" of an element.Explain how the tilt of Earth's axis of rotation, with respect to the sun, causes the seasons.
which of these is true for bacteria because they are prokaryotic cells
a- they can destroy neutrophils
b- they are much smaller than lymphocytes
c- they can invade macrophages
d- they are much larger than killer T cells
Figure 17-3 shows smaller and larger beaks in a population of finches. One group of birds has a short, parrot-like beak and another group has a long, narrow beak. What process has probably occurred?
Answer:
Natural selection has occured, and through evolution, the finches have evolved to adapt to their surroundings.
Answer:
disruptive selection
Explanation:
The question above shows a situation resulting from the disruptive selection process.
Disruptive selection is a type of natural selection that allows individuals with more extreme characteristics to be favored by the environment and end up having a better chance of surviving and generating descendants. Individuals with intermediate characteristics end up being disadvantaged and have less chance of survival.
In relation to the question above, we can say that the short-beaked birds will have greater facilities in breaking seeds and therefore will be favored. Long-billed birds will find it easier to reach worms for food. On the other hand, medium-billed birds (intermediate characteristics) will be less favored both in hunting worms and in breaking hard seeds.
In a paragraph, explain what effect very large small pores and their diffusion rates would have on the workings and mechanisms of a cell
Answer:
Despite differences in structure and function, all living cells in multicellular organisms have a surrounding cell membrane. As the outer layer of your skin separates your body from its environment, the cell membrane (also known as the plasma membrane) separates the inner contents of a cell from its exterior environment. This cell membrane provides a protective barrier around the cell and regulates which materials can pass in or out.
Explanation:
MARK BRAIN LIST
Answer:
Small pores are effective in cellular transportation as compared to large pores.
Explanation:
If the pores of the cell membrane become large in size then the rate of diffusion into and out of the cell would be very fast. This is not a good situation as in an organism with uncontrolled/high rate of cellular transfers could lead to death of cells. Hence small pores are effective in maintaining the required permeability , material transfers across the membrane, turbidity and water pressure for osmosis.
Which statement describes an advantage of asexual reproduction?
Answer:
no mate is required
Explanation:
It requires less energy.
What is so important about phospholipids being insoluble in water?
A. it allows our cells to absorb water
B. it allows them to function similar to fats
C. it prevents our cells from absorbing water
D. it allows our cells to dissolve without having to exert energy
Answer:
D. it allows our cells to dissolve without having to exert energy
Explanation:
Phospholipids being insoluble in water is so important because it allows our cells to dissolve without having to exert energy.
Select the correct answer.
A skeletal muscle is a composition of several components bundled one into the other. At which structural level in the muscle does contraction occur
to bring about contraction in the whole muscle?
Answer:
The correct answer will be- myofilamants-actin and myosin.
Explanation:
The skeletal muscle is made up of the muscle fibers which are cylindrical cells enclosed by layers. The muscle cell is divided into smaller units, the smallest of which is myofilaments.
The myofilaments are composed of the thin filaments called actin and thick filaments called myosin which together forms the functional unit of a muscle known as the sarcomere. The muscle contraction takes place due to the sliding of these actin and myosin over each other as a result of the signals arrived from the CNS.
Thus, myofilaments-actin and myosin is the correct answer.
Which atmospheric layer prevents meteoroids from reaching Earth's surface?
mesosphere
stratosphere
thermosphere
troposphere
Answer:
mesosphere layer - first choice
Answer: Option B. "Mesosphere"
Explanation:
Atmospheric layer that prevents meteoroids from reaching Earth's surface is mesosphere.
The mesosphere is the highest layer of the atmosphere and above the stratosphere. In the mesosphere layer, the air relatively mixed together in this layer and the temperature decreases along with the altitude and most of the meteors burn up in the mesosphere.
Thus the correct option is mesosphere.
Disturbances inside Earth’s core cause earthquakes. The starting point of the disturbance is called the epicenter. Why does the amplitude of a seismic wave usually decrease as the wave moves away from the epicenter?
Answer:
The energy released by the earthquake spreads throughout a larger volume of Earth.
Explanation:
At farther distances the amplitude of the seismic waves decreases as the energy released by the earthquake spreads throughout a larger volume of Earth. Also with increasing distance from the earthquake, the waves are separated apart in time and dispersed because P, S, and surface waves travel at different speeds.
Which of the forest management practices keeps the florist in a state of mid to late succession
D. seed-tree cutting
which correctly shows the transfer of energy within an ecosystem?
A. producer, decomposer, herbivore omnivore
B.carnivore, herbivore, decomposer, omnivore
C. omnivore, carnivore, herbivore, primary consumer
D. producer, herbivore, carnivore, decomposer
producer, herbivore, carnivore, decomposer (option D).
The correct sequence showcasing the transfer of energy within an ecosystem is producer, herbivore, carnivore, decomposer. The cycle begins with producers who are eaten by herbivores. These herbivores in turn are eaten by carnivores. Lastly, decomposers break down all the dead or waste materials, returning nutrients back to the ecosystem.
Explanation:The correct order that shows the transfer of energy within an ecosystem is producer, herbivore, carnivore, decomposer (option D). The cycle initiates with producers like plants or phytoplankton, which convert light energy into useful forms via photosynthesis or chemosynthesis. These producers, forming the base of the ecosystem, are consumed by herbivores, termed as primary consumers. Secondary consumers, often carnivores, feed on these primary consumers. Lastly, decomposers, such as fungi and bacteria, break down all the dead organisms or waste materials from each trophic level, recycling nutrients back into the ecosystem.
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Describe what happens in budding
At higher elevations, the boiling point of water decreases, due to the decrease in atmospheric pressure. As a result, what could be
said about hard boiling an egg?
a. At higher elevations, it would take less time to hard boil an egg, because there is less atmospheric
pressure.
b. At higher elevations, it would take longer to hard boil an egg, because there is a lower boiling point,
the egg is boiling in water at a lower temperature.
c. At higher elevations, it would take less time to hard boil an egg, because there is a lower boiling point
Therefore it would take less time to achieve the boiling point.
d. At higher elevations, it would take longer to hard boil an egg, because it would take longer to achieve
the boiling point
b. At higher elevations, it would take longer to hard boil an egg, because there is a lower boiling point, the egg is boiling in water at a lower temperature. The correct answer is that at higher elevations, it takes longer to hard boil an egg because the water boils at a lower temperature due to reduced atmospheric pressure.
At higher elevations, the boiling point of water decreases due to the decrease in atmospheric pressure. When hard boiling an egg, this means that the water will boil at a lower temperature, so the correct answer is: b. At higher elevations, it would take longer to hard boil an egg, because there is a lower boiling point, the egg is boiling in water at a lower temperature.
The interaction between atmospheric pressure and boiling point is such that as pressure decreases, the boiling point also decreases. This means that at higher elevations where the pressure is lower, water does not reach as high a temperature when it boils compared to sea level, which implies that cooking an egg thoroughly will require more time as the temperature at which energy is transferred to the egg is lower.
What are Mendel’s three laws of inheritance
Answer:
Mendel's studies yielded three "laws" of inheritance: the law of dominance, the law of segregation, and the law of independent assortment. Each of these can be understood through examining the process of meiosis.
Use the periodic table to identify the name of atomic number for each element below. (Give the name not the chemical symbol for each element)
Answer: Hafnium-72
15-Phosphorus
45- Rhodium
Osmium-76
Magnesium-12
Explanation:
Explanation:
Hafnium is a transition element and belongs to period six. It's atomic number is 72.
Element with atomic number 15 belongs to group 5 and period third. Name of this element is phosphorous. Symbol that represents phosphorous is P.
Element with atomic number 45 is a transition element and it belongs to period 5. Name of this element is rhodium and it is represented by the symbol Rh.
Osmium is also a transition element and belongs to period six. It's atomic number is 76.
Magnesium is a group 2 element and belongs to third period. Atomic number of magnesium is 12.
Hence, we can conclude that complete information in the given table will be as follows.
hafnium : atomic number 72
phosphorous : atomic number 15
rhodium : atomic number 45
osmium : atomic number 76
magnesium : atomic number 12
Select the correct answer from each drop-down menu.
The_____(lysosome, ribosome ,nucleus)
gets rid of cell waste by breaking down large molecules into smaller ones for the cell to excrete. The____(Golgi apparatus,cell membrane, endoplasmic reticulum)
helps these waste molecules exit the cell.
Answer: Lysosome, Cell Membrane
Explanation: Lysosomes are little sacs in the cell that latch onto waste materials and break them down (I've found an easy way to remember this is to remember that the root "lys" means "to split" or "to break down"). As for the second part, the Cell Membrane is the outermost layer of the cell, and is responsible for allowing things in and out of the cell.
Answer:
Answer: Lysosome, Cell Membrane
Explanation: Lysosomes are little sacs in the cell that latch onto waste materials and break them down (I've found an easy way to remember this is to remember that the root "lys" means "to split" or "to break down"). As for the second part, the Cell Membrane is the outermost layer of the cell, and is responsible for allowing things in and out of the cell.
Explanation:
no
Use the cladogram about fish to answer the
following questions.
Bones
Jaws
Which of the following best describes the
organism located at point B?
does not have jaws
has bones, but not jaws
has bones
has jaws, but not bones
DONE
Answer: Has jaws but no bones
Explanation:
Amino acids bond to each other using hydrogen bonds. true or false
Answer:
The correct answer is false
Explanation:
Question 3 of 10
2 Points
A paleontologist finds a plant fossil that shows evidence of a vascular
structure. What can the paleontologist conclude?
O
A. It was a sporophyte.
B. It was a gametophyte.
C. It was an ocean plant.
D. It was a land plant.
If a paleontologist finds a plant fossil that shows evidence of a vascular structure, he can conclude that it was a land plant. Thus, the correct option is D.
Who is Paleontologist?A Paleontologist may be defined as a scientist who is a specialist in the study of past life forms that existed in previous geologic periods, as represented by their fossils. The science that deals with the life of past geologic periods as known from fossil remains are known as paleontology.
Sporophyte plants are non-vascular plants such as Mosses. The gametophytes have no vascular tissues at all. Ocean plants are rooted in the soil deep in the soil. They do not have vascular tissues.
Land plants such as banyan trees, mango trees, etc. have well-defined vascular structures for the transport of food and nutrients from the soil to the entire plants.
Therefore, if a paleontologist finds a plant fossil that shows evidence of a vascular structure, he can conclude that it was a land plant. Thus, the correct option is D.
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Which best describes the outcome of DNA replication? The new DNA molecule consists of one strand of DNA. The new DNA molecule accumulates a new strand of DNA with each replication. The new DNA molecule consists of one new strand and one old strand of DNA. The new DNA molecule contains new DNA, and the old molecule keeps the old DNA.
Answer:
The new DNA molecule consists of one new strand and one old strand of DNA
Answer:
The correct answer is the third statement.
Explanation:
The replication of DNA refers to a biological phenomenon, which produces two similar molecules of DNA that are the replicas of the original molecule of DNA. The double-stranded DNA gets distinguished into two template strands. Each of the template strand functions as a guiding strand for generating a counterpart known as a complementary strand.
The complementary and the template strands attach with each other to produce a new double-stranded DNA. Thus, the new molecule of DNA comprises one new strand (complementary strand) and one old strand (template strand) of DNA.
17. Matter is defined as anything that has
and volume.
atoms
mass
O molecules
energy
Mass and volume
(make me brainliest answer por favor)
Definition of matter:
physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
All animals are A. autotrophs. B. biotrophs. C. heterotrophs. D. polytrophs.
Answer:
C. Heterotrophs
Explanation:
Heterotrophs cant make their own food. They cant make there own food so they eat animals and plats and all sorts of different things. Because of this heterotrophs are known as consumers. Anything that consumes/eats things are consumers.
Which would be an adaptation in a rain forest, but not in a desert?
A. Ability to store water for a long time
B. Better eyes for hunting prey
C. Skin that blends in with green plants
D. Very small leaves to trap water
ANSWER:
The correct option is C: Skin that blends with green plants. Most animals in rain forests are green so that they can camouflage and appear like plants.
EXPLANATION:
Adaptation is the way in which animals survive in different climatic conditions and different regions. In rain forests, to protect themselves and to find food, most animals are green in colour. This prevents the animals from being spotted easily and therefore they are protected from hunters and other animals that eat them. This way, the animals can also find their prey and catch it easily.Answer: c <3
Explanation:
The movement of tectonic plates in two locations is described below: 1) Location A Tectonic plates push together. 2) Tectonic plates pull apart. Which statement is most likely true? A) ocean basins May form in both locations. B) volcanic eruptions May occur in both locations. C) ocean basins May form in location A but not in location B. D) volcanic eruptions May occur in location B but not in location A.
Answer:
The answer is D.
Explanation:
Plates which pull apart are known as divergent plate boundaries, while plates which push together are known as convergent plate boundaries. At divergent plate boundaries, magma flows up from the inner parts of the earth and flows out. When it cools and turns to stone, types of volcanoes are left. Magma is stored inside the volcanoes.
How do bacteria cause disease?
A. A bacterium injects its DNA into the genome of a host cell.
B. A bacterium reproduces inside a host cell and causes the cell to
break open.
C. A bacterium replaces the host cells with bacterial cells.
D. A bacterium releases harmful proteins or other poisons into the
host's body
Answer:
A Bacterium injects its DNA into the genome of the host cel. (Ans. A)
Explanation:
This stage of bacteria causing disease is known as Lytic cycle ,in this cycle phage 1st binds to the receptor present on the surface of the bacterial cell. Then the phage injects its DNA into the host cell and then protein synthesis and DNA coping occurs. The capsid proteins are stuffed with DNA to make lots of new phages particles.
which species biological calssification translates to the goddess of hairy shellfish and was first discovered in the pacific ocean in 2005
Answer:
Kiwa hirsuta (aka the yeti crab).
Explanation:
Kiwa hirsuta is biological calssification translates to the goddess of hairy shellfish and was first discovered in the pacific ocean in 2005.
What types of animals are Dolphins And Elephants
A: Amphibians
B: Arthropods
C: Predators
D: Mammals
Please need help fast
Answer:
Mammals are the warm-blooded vertebrates that can be found in water and land. The dolphins and elephants are the examples of:
Option D. Mammals
Explanation:
Mammals are organisms characterized by the presence of mammary glands, warm-blood, four-chambered heart, and are viviparous. Dolphins and elephants also belong to the category of mammals because they exhibit the characteristics of the phylum Mammalia. Elephants and dolphins are placental mammals, which give birth to young ones.
Reasons for incorrect answers:
A. Amphibians are organisms that can live on land and water. The animals are characterized by cold-blooded, reproduce externally, and skin is limy and smooth. Examples include frogs and salamanders.
B. Arthropods are generally known as insects, which consisted of jointed appendages, segmented bodies, and lack vertebral column. Examples include spiders and cockroaches.
C. Predators are the organisms that attack and kill prey. For example, a tiger is a predator, who kills and feeds on deer and antelope.
Therefore, mammals are the highest classification in kingdom Animalia, which are characterized by mammary glands and the ability to deliver young ones. Elephants and Dolphins are the examples of mammals.
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Why do scientists conduct experiments?
A. To test their results.
B. To explain an observation.
C. To test a hypothesis.
D. To test a conclusion.
What do you write for “Introduction” in a biology lab report?
Answer:
Start by introducing your topic. What are you learning about? How will it impact your life or the lives of others? Give some context, or background information, to your audience if it is an uncommon topic. Try not to explain anything about your experiment or the data that you collected. Share what you were trying to find out, what your problem was. Conclude it by introducing how you started to research.