The mean diameter of phytoplankton cell is 650 micrometers at a distance of 25 kilometers from the sea shore.
The mean diameter of phytoplankton cell is 650 micrometers because at every 5 kilometers, decrease occur in the diameter of phytoplankton cell about 50 micrometers and we know that the the diameter of phytoplankton cell is 900 micrometers so for 25 kilometers there is 250 micrometers decrease occur in the diameter of phytoplankton cell.
So this 250 micrometers are substracted from 900 micrometers we get 650 micrometers. So we can say that the mean diameter of phytoplankton cell is 650 micrometers at 25 kilometers distance from the sea shore.
Learn more: https://brainly.com/question/17549978
The outer structure of the neuron is made of a
a semipermeable membrane
Which of the following is a nucleotide found in DNA?
Answer: The four nitrogenous bases in DNA are guanine, adenine, cytosine and thymine; in RNA, uracil is used in place of thymine.
Explanation:
Hopefully this helps you.
What is in the center of every atom?
Answer:
The Nucleus, comprised of Protons and Neutrons.
water molecules are polar with the
B-cells do which of the following things?
a. Make antibodies
b. Inhibit Function of other T-cells and B-cells
c. Stay in circulation to speed up response to an antigen the next time
d. Stimulate Function of other T-cells and B-cells
e. Take in and process antigens binding them to MHC protein
f. Attack cells infected by viruses
Answer:
a. Make antibodies
Explanation:
B-cells is one of the two types of lymphocytes or white blood cells produced in the marrow of the bone (the other being T-cells). B-cells are a part of adaptive or acquired immunity in our body i.e. a learned defense after a pathogen might have penetrated.
B-cells help combat foreign Invaders that make way into the body by producing ANTIBODIES, which are specific to a particular pathogen. Note that, the B-cells learnt to combat based on a previous infection of such pathogen. In response to an antigen, the B-cells produce the plasma cells, which in turn produce the antibodies.
HELP PLEASE :,,,,,,,|
Answer:
i think it is B
Explanation:
i hope it help
What types of cells contain a cell
wall?
Answer:
Plant cell
Explanation:
Cell wall only in plant cells
Describe the path of a signal from a neuron's dendrite to a second neuron's dendrite.
Answer:
Dendrite are short hair like structures originating the periphery of the cytoplasm. Dendrites are either in close contact with other neurons or the stimulus receptor cells.
I would attach a diagram with this note I hope it helps.
why insect mouth part is important for insect pest control?
Answer:
Insects with rasping/sucking mouthparts actually rasps or scrapes the surface of plant tissue (such as leaves or petals) and sucks up the fluids that ooze from the damaged area of tissue. Examples of pests with rasping-sucking mouthparts include thrips and mites. Thrips prefer to feed on succulent plant tissues.
Explanation:
I hope it helped
Which of these organisms does NOT produce an enterotoxin?
a. Shigella spp.
b. Clostridium botulinum.
c. Vibrio cholerae.
d. Staphylococcus aureus.
Answer:
b. Clostridium botulinum.
Explanation:
The enterotoxins (also know as exotoxins when they are produced by bacteria) are polypeptides secreted by microorganisms that target the intestine. These toxins may produce serious damage to the host by disrupting the function of the epithelial intestinal cells Moreover, Clostridium botulinum is a Gram-positive bacterium that is able to produce a potent neurotoxin (botulinum) which is known to cause severe flaccid paralytic deformities in humans.
The organism that does NOT produce an enterotoxin among the options given is b) Clostridium botulinum. Clostridium botulinum is a bacterium known for producing botulinum toxin, which is a neurotoxin rather than an enterotoxin. It does not, however, create an enterotoxin.
The severe sickness known as botulism is brought on by the botulinum toxin, which predominantly affects the nervous system.
Although enterotoxins can induce diarrheal disorders and are linked to gastrointestinal symptoms, an organism need not produce an enterotoxin to be pathogenic. The host's sensitivity to infection and the infectious dosage are other important variables.
To know more about enterotoxin:
https://brainly.com/question/31722405
#SPJ6
the disease erythroblastosis fetalis (also called hemolytic disease of the newborn) develops in a fetus or a newborn infant with Rh-positive blood and an Rh-negative mother. Symptoms results when maternal anti-Rh antibodies cross the placenta and interact with the fetus' erythrocytes. Why are the children of Rh-positive mothers not ay risk for this disease
Answer:
Explanation:
Hemolytic Disease of the newborn (HDN, Erythroblastosis Fetalis) is a blood disorder occurring at or around birth, where the blood groups of the mother and baby are not compatible. It occurs when the antibodies from a Rhesus negative (Rh-negative) mother, who has been sensitized from previous pregnancies or other means (transfusion etc), gives birth to an Rh-positive baby, and the blood of the mother and the baby eventually mixes. This causes the anti-Rhesus antibodies in the mother's blood to attack the Rhesus antigen (Also Called Anti-D antigen) on the baby's red blood cells, causing hemolysis that leads to several unpleasant symptoms.
Children of Rh-positive mothers are not at risk of developing HDN, because the mother does not produce anti-Rh antibodies since she is positive, hence there will be no antibodies to cross the placenta and react with the baby's rhesus antigens for Rh-positive babies.
What is the Density of an object with a mass of 20 grams and a
volume of 10 cmº?
The element phosporus is located to the right of the element magnesium along the same period in the periodic table.
Which best describes the relationship of the elements ?
A. Magnesium has a larger atomic number
Answer: B. Phosphorus has a larger atomic mass.
C. Magnesium is in the same category as phosphorus
D. Phosphorus has similar chemical properties as magnesium
Answer:
b
Explanation:
The relationship which describes the best of the element"B. Phosphorus has a larger atomic mass."The correct option is B.
Atomic mass:
Atomic mass refers to the combined mass of protons, neutrons, and electrons in an atom.
The periodic table arranges elements in order of increasing atomic number, which corresponds to the number of protons in an atom's nucleus.
Elements in the same period (horizontal row) have the same number of electron shells, while elements in the same group or column have similar chemical properties.Phosphorus is located to the right of magnesium along the same period, indicating that it has a larger atomic number (more protons) than magnesium.Phosphorus has a larger atomic mass, while magnesium has a smaller atomic mass compared to phosphorus.Therefore, the correct option is B.
To know more about the Periodic table, click here
https://brainly.com/question/8832755
#SPJ7
Which of the following orders of animals are vegetarians?
a. Proboscidea
b. Artiodactyla
c. Lagomorpha
d. All of the above
Answer: Option D.
All of the above.
Explanation:
Proboscidea , Artiodactyla , Lagomorpha are all vegetarians and vegetarians are animals that feed on plants i.e grasses, shrubs e.t.c.
These order of animals are refered to herbivorous animals i.e animals that feed on plants and they have two pairs of growing incisors,molars and premolars.
Members of lagomorphs are rodents, hares, rabbit, pikas e.t.c.
Artiodactyla members are cattles, camels, pigs e.t.c. These order have tusks for defending themselves.
Proboscidea include elephants.
what are 3 ways your skin protects you
Answer:
The skin protects us from microbes and the elements, helps regulate body temperature, and permits the sensations of touch, heat, and cold.
What is the molecular weight of 1 mole of NaCl where the atomic mass of Na = 23 and Cl = 35.4?
A student who studies the sizes of groups of birds records
data for this group of ducks.
Which two terms describe the relationship between the two variables in this graph
A:negative
B:strong
C:weak
D:positive
Negative and strong apex
Answer:
c
Explanation:
1. A bacteria cell that divides to create two exact copies of itself is an
example of
A. sexual reproduction
B. homeostasis
c. asexual reproduction
D. DNA replication
Answer:
Asexual Reproduction
Explanation:
As the bacteria cell is dividing on its own to create more bacteria, it is performing asexual reproduction as it is not reproducing with a secondary bacteria cell.
Asexual reproduction is the process by which a bacteria cell that divides to create two exact copies of itself. Thus option C is correct.
What is bacterial cell division ?Bacteria reproduce by the process of asexual reproduction which is mainly binary fission, where the offspring produced from parent are similar.
In this process parent cell is undergo division and separated into two new daughter cells. Each daughter cell get one copy of its parent DNA.
No spindle apparatus formation occur in binary Fission. In this process, the DNA molecule undergo replication and attaches each copy to various parts of the cell membrane
For example, Prokaryotes like E. coli, Archaea and some eukaryotes like euglena reproduce through binary fission.
The advantage of binary fission is very fast and it requires single organism or parent.
Thus option C is correct.
Learn more about asexual reproduction , here:
https://brainly.com/question/11013499
#SPJ2
I need help with my biology work please
I did the. work on this piece of paper and the only reason I'm typing here is because I need an answer to submit
If plants in a population seriously decreased, how would the animals in that population be affected? EXPLAIN
Answer:
because a lot of animals eat plants, so a lot of animals will die off/ or move to a place with lots of plants.
Explanation:
most animals live off eating plants.
How many trophic levels are there in the following food chain?
Grass - Grasshopper - Frog - Snake
Answer: Four
Fun Fact - Locusts are actually species of short-horned grasshoppers, they often gather in large swarms and can destroy entire fields of crops, because a single grasshopper can eat half its body weight in plants per day.
There are four trophic levels in the given food chain, i.e., producer, primary consumer, secondary consumer, and tertiary consumer.
What is a food chain?A food chain is a network of connections in a food web that begins with producer organisms and ends with a predator, detritivore, or decomposer species.
In the given food chain, grass is produces, grasshopper is primary consumer, frog is secondary consumer, while snake is tertiary consumer.
Thus, there are four trophic levels in the given food chain.
For more details regarding food chain, visit:
https://brainly.com/question/7564953
#SPJ2
3. Phosphorus represents only 1% of human body weight. However, it is a building
block of very important macromolecules. Describe some of the cellular functions
that would not be possible without phosphorus.
Answer:
It would be impossible to store and transfer genetic information
It would be impossible to carry out majority of cellular activities due to lack of usable energy.
Explanation:
Phosphorus, as stated in the question, represents a very low amount in our body system, however, its role in living systems cannot be underestimated. Phosphorus is a vital component of major biomolecules in our system.
- It is the building block of the NUCLEOTIDES that make up nucleic acids. Nucleic acids (DNA and RNA) store genetic information and help transfer it to offsprings. However, without one of the elemental components (phosphorus) that make up its structure, it will not be produced. Hence, the storage and transfer of genetic information will be impossible.
- Phosphorus also makes up the structure of the ADENOSINE TRIPHOSPHATE (ATP) molecule. ATP provides the cell with all the energy used in carrying out cellular functions. However, the absence of phosphorus needed for the synthesis of ATP, ATP will not be produced and ultimately no energy.
The total magnification of a specimen viewed under a compound light microscope is determined by the power of the objective lens added to the power of the ocular lens the magnification power of the ocular lenses used the power of the objective lens multiplied by the power of the ocular lens the magnification power of the objective lenses used
Answer:
The power of the objective lens multiplied by the power of the ocular lens
Explanation:
Answer:
c. The power of the objective lens multiplied by the power of the ocular lens
Explanation:
*
4. What are the only prokaryotes?
Answer:
Bacteria is the only prokaryotes.
Some cynobacteria are also included in prokaryotes.
Which molecule has the lowest potential chemical energy?
Answer:
i have the same question too?
Explanation:
Chemical potential energy is defined as the energy present or stored in the chemical bonds of a substance. The decreasing order of the molecules with chemical potential energy is solid, liquid, and gas.
The correct answer is:
Option B. Carbon dioxide
The chemical potential energy can be explained as:
1. ATP and NADH are the energy currency of the cells, such that these molecules yield energy when the bonds are broken down.
2. Glucose is a solid compound that will have a high chemical potential energy as compared to carbon dioxide.
3. Carbon dioxide is a gaseous compound that will have the least chemical potential energy as compared to ATP, NADH, and glucose.
Thus, carbon dioxide will have the least potential chemical energy.
To know more about chemical potential energy, refer to the following link:
https://brainly.com/question/1907128
What is the composition of hair?
Answer:
The hair is made up of 95% keratin, a fibrous, helicoidal protein (shaped like a helix) that forms part of the skin and all its appendages (body hair, nails, etc.). Keratin is synthesized by keratinocytes and is insoluble in water, thus ensuring impermeability and protection for the hair.
Explanation:
The part of the gene that is designated as 1 is also known as:________.
Answer:
Immune or sensory genes.
Explanation:
The part of genes designated as part 1 Gene is refer to immune or sensory genes because these part of gene play a vital role in immune response or sensory signals of the cell.
The part of genes have the same Expression level and different copy number variable region.
Under which circumstance does Mendel’s principle of independent assortment hold? a. only when there is crossing over b. only when traits are tightly linked (close together) on the same chromosome c. only when traits are on different chromosomes d. only when the traits are not influenced by selection
Answer:
c
Explanation:
Mendel's principle of independent assortment holds only when traits are on different chromosomes.
The independent assortment principle states that genes assort independently of one another. In order words, traits are independently inherited by offspring from parents. For example, the trait for eye color is independently inherited from skin color, height is independently inherited from feet size, and etc.
This principle only holds true when genes are located far away from one another on the same chromosome or when they are on different chromosomes entirely. Once genes are close to one another on the same chromosome, they become linked together and no longer independently inherited.
The correct option is c.
What are the two divisions of the autonomic nervous system?
A. sympathetic and central nervous systems
B. central and somatic nervous systems
C. sympathetic and parasympathetic nervous systems
D. parasympathetic and somatic nervous systems
The two divisions of the autonomic nervous system are the sympathetic and parasympathetic nervous systems. The correct option is C. sympathetic and parasympathetic nervous systems.
Nervous systemFrom the question, we are to determine the two divisions of the autonomic nervous system.
The nervous system is divided into two main parts, which are
Central nervous system.Peripheral nervous system.The central nervous system is made up of the brain and the spinal cord, while the peripheral nervous system is made up of the nerves and ganglia that lie outside of the brain and spinal cord.
The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system.
The autonomic nervous system is further divided into the sypathetic nervous system and the parasympathetic nervous system.
The sympathetic nervous system is for fight or flight responses, and
The parasympathetic nervous system is for rest and digest responses.
Hence, the two divisions of the autonomic nervous system are the sympathetic and parasympathetic nervous systems. The correct option is C. sympathetic and parasympathetic nervous systems.
Learn more on Nervous system here: https://brainly.com/question/26348097
do prokaryotes have chromatin?
Answer:yes
Explanation:
Yes