Which of these statements are true about diffusion
A. It is how gas exchange occurs in the blood cells in the circulatory system
B. It is when particles move from an area of low concentration to high concentration
C. It is how white blood cells travel around in the body to find viruses and bacteria
D. It is how sunlight gets absorbed into chloroplast in plants for photosynthesis
Answer: c
Explanation:
List three potential effects of errors occurring during meiosis.
Errors can occur during meiosis producing gametes with an extra or missing chromosome. The consequences of this following fertilisation depend on which chromosomes are affected. Often the embryo is not viable, but some of these errors can lead to trisomy conditions or sex chromosome disorders.
Explanation:
:)
A database speeds up the sharing of scientific knowledge by:
A. assembling large amounts of information in a single location.
B. forming the lowest part of a structure, building, or pedestal.
C. increasing the rate of a chemical reaction when present in
solution
D. reducing a complicated idea to a simple mathematical expression.
SUBMIT
Answer:B: assembling large amounts of information in a single location.
Explanation:
Calculate the number of neutrons in atoms of the isotope 3919K
With working out
Answer:
20 neutrons
Explanation:
In the atom of an element, there exists three subatomic particles namely; proton, neutron and electron etc. The sum of the number of neutrons and number of protons (a.k.a atomic number) in an atom makes up the mass number.
In this question, an element was given as follows: 39- 19 K meaning that the mass number is 39 but the atomic number is 19.
Hence,
no of. neutrons = mass no. - atomic no.
39 - 19 = 20 neutrons.
The thin outer layer of the skin is called the _____.
endodermis
dermis
fatty layer
epidermis
The thin outer layer of the skin is known as the Epidermis. So, the correct option is D.
What is Epidermis?The epidermis, which is referred to as the skin's outermost layer, shields the body from the elements. Depending on the kind of skin, the epidermis can be as thin as.05 mm on the eyelids or as thick as 1.5 mm on the palms and soles of the feet.
The body is shielded by the epidermis from harmful substances like chemicals, pathogens (bacteria, viruses, fungus, and parasites), and ultraviolet (UV) radiation. The epidermis, which is the skin's outermost layer and gives skin its tone, serves as a waterproof barrier. The dermis, which lies underneath the epidermis, is made up of hard connective tissue, hair follicles, and sweat glands.
Thus, the correct option is D.
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The most direct method by which an ion or molecule can move across a cell membrane is by ____________.A. using an integral protein.B. a sodium-potassium pump.C. simple diffusion. D. active transport.E. osmosis.
Answer:
C. Simple diffusion
Explanation:
Simple diffusion from a high to low concentration is the most direct method that ions or molecules can move across a cell membrane.
Through this method, no proteins are required for transport, and no energy is used.
The ion or molecule being transported directly moves across the cell membrane, without any other factors involved.
So, the correct answer is C. Simple diffusion
HELP ASAP I WILL GIVE BRAINLIST
What is the pH of a solution with a 4.60 × 10−4 M hydroxide ion concentration? (4 points)
0.663
3.33
10.1
10.7
Answer:
10.7
Explanation:
According to this question, we have 4.60 × 10^-4 M hydroxide ion (OH-) concentration.
Since we were given the OH concentration, we first calculate the pOH of the solution, which is given as:
pOH = -log {OH-}
pOH = - log {4.60 × 10^-4}
pOH = - log {0.000460}
pOH = 3.337
pOH = 3.34
Given that; pOH + pH = 14
The pH of the solution = 14 - pOH
pH = 14 - 3.34
pH = 10.66
pH = 10.7
Answer:
The answer is 10.7
Explanation:
Which of the following is the best definition of a scientific law? O A. A set of rules for ethical conduct during an experiment B. A statement that describes how natural events happen O C. An explanation of natural events that is well supported by scientific evidence O D. An educated guess that explains the answer to a scientific question
Scientific law is a statement that describes how natural events happen on the earth.
What is scientific law?
A scientific law is defined as a statement that describes an occurrence of event in nature. This term is used in all of the sciences that is related to nature.
So we can conclude that Scientific law is a statement that describes how natural events happen on the earth.
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The islets of Langerhans are surrounded by
A-exocrine cells that produce digestive fluid.
B-endocrine cells that produce digestive fluid.
C- exocrine cells that produce glycogen
D-B and C
PLEASE HELP ME ITS REALLY URGENT CAUSE I HAVE EXAMS TOMORROW!!!
Answer:
A-exocrine cells that produce digestive fluid.
Explanation:
The pancreas is composed of both exocrine cells (capable of producing digestive enzymes) and endocrine cells (involved in the production of hormones that control glucose homeostasis). The islets of Langerhans are clusters or 'islands' of pancreatic endocrine cells, which consist of α-cells that produce glucagon, β-cells that secrete insulin and δ-cells that produce somatostatin. These islets are surrounded by: 1-exocrine cells called 'acini' that produce digestive enzymes such as chymotrypsin, trypsinogen, lipase, and elastase; and 2-bile ductules, which are tubes that carry bile from the liver and the gallbladder through the pancreas.
what is the polynomial system of nomenclature as used in the middle ages?
Explanation:
Polynomial System of nomenclature was the older form of naming organisms before the advent of binomial system. In polynomial system, a generic name and specific name which consisted of many words were used. It was eventually found to be incompatible and hence was replaced by binomial system.
Which of these organelles prepares proteins to be fully functional?
A. Rough endoplasmic reticulum
B. Large vacuoles
C. Smooth endoplasmic reticulum
D. Chloroplasts
Rough endoplasmic reticulum
Answer:
Rough endoplasmic reticulum is among the organelles that are found in eukaryotic cells. The reason as to why it is called rough is because it has ribosomes attached to its surface. Its main function is to produce proteins.
Explanation:
The final phase of translation, called termination, is signaled by three nucleotides, called a __________, that mark the end of a polypeptide chain. intron exon plasmid stop codon
Answer:
The correct answer is "stop codon"
Explanation:
Codon is a trinucleotide (three nucleotides) sequence that translates to a specific amino acid or stops the translation of genetic sequence to amino acids. There is a codon table that is usually used to determine the corresponding protein.
However, a sequence of DNA or RNA sequence will have 3 nucleotides (codons) each been translated to a specific amino acid. For example, the sequence below can be translated as follows
5' - UAUGGAUUUAGACACUAG -3'
UAU - Tyrosine
GGA -Glycine
UUU - Phenylalanine
AGA - Arginine
CAC - Histidine
UAG - stop codon
The stop codon is a codon that doesn't code for any amino acid and signals the stop of protein synthesis/gene translation of a sequence. There are three stop codons which are UAG, UGA and UAA.
In which of the scientific classifications are all the
animals grouped
Describes vitamin D levels and problems
Answer:
Vitamin D is essential for strong bones,because it helps the body use calcium from the diet.
PNS axons are vulnerable to cuts, crushing injuries, and other types of trauma. However, a damaged ____________ can regenerate if the ____________ remains intact and a critical amount of ____________ remains. The success of peripheral nervous system axon regeneration depends upon two primary factors: (1) the amount of ____________ and (2) the ____________ between the site of the damaged axon and the ____________ . The possibility of repair is ____________ with an increase in either of these two factors. Neurolemmocytes play an active role in regeneration
Answer:
The correct answer is - damaged, effector organ, neurilemma, damage, distance, cell body, decreased.
Explanation:
PNS axons are prone to cuts, and other types of injuries. A damaged axon can regenerate if the effector organ remains intact and a critical amount of neurilemma is found.
The degree of success of these axons regeneration depends upon factors that are (1) the amount of damage, and (2) the distance between the site of the damaged axon and the cell body it innervates The possibility of repair is reduced with an increase in either of these two factors. Neurolemmocytes play an active role in regeneration
Umm.. Hi there! Can someone please help me out with this? (only for those who know the answer)
Bcoz I really need this rn :(
even though it is multiple choice, I still need your explanation for your answers. Thanks!!
DUEEEE AFTERRR LUNCHH! :(:(:(:(
If your answer is NONSENSE it will be deleted as soon as possible!
But if your answer is CORRECT, HELPFUL, HAS AN EXPLANATION, I'll chose your answer as the BRAINLIEST ANSWER!
Atomic size increases down a group and descreases across a period because when going down a group number of shells of elements increases and across periods number of shells stay the same but the number of electrons increases which will cause too much weight on the atom and it gets diminished. so according to that:
3. A
4. B
5.C( because noble gases are stable)
1.A
2.C
Answer:
3. (a)
4. (c)
5. (c)
1. (a)
2. (b)
Explanation:
3.
from left to right across a period the atomic size decreases because the nuclear charge increases while the no. of valence shells remains constant. The strong electrostatic force between the nucleus and the electrons draws the outermost shell inwards resulting in decrease of atomic radius from left to right.
so, the answer is a. atomic radius of elements decreases from left to right.
4.
Argon has the largest atomic size. Yeah I know, I just said that the atomic radius decreases on moving across a period BUT Nobel gases are exception. In fact they have the largest atomic size in a period. This is because their valence shells are complete and this cause the internal electrons to repel each other thus pushing the valence shell away from the nucleus causing the atomic size to increase.
so the answer is c. Argon
5.
Halogens have the smallest radius in a period. Because their nuclear charge is greatest in a period.
so the answer is c. Halogens
CONCLUSION :-
1.
since, the atomic size increases down the group and decreases along a period the biggest elements are arranged in the bottom and in the left side of the periodic table.
so option a.
2. For metals the atomic radius is directly proportional to their reactivity
metals have to lose electrons in order to become stable and the easier they lose electrons the higher is their reactivity also that a metal will lose electrons easily if it's atomic radius is large so that the outermost electrons are loosely bonded and can be withdrawn easily.
so option. b.
Explain the role of cellular respiration in a cell.
Answer:
Every cell performs a type of cellular respiration as it is required to produce energy. The point of cellular respiration is to turn high-energy molecules, know as glucose, into ATP, a form of usable energy. There are two types of respiration, aerobic and anaerobic. Aerobic goes through 3 stages and produces the most ATP by using oxygen and releasing carbon dioxide. Anaerobic does the same job but only uses one stage and produces much less ATP. This process gives the cell energy and continues the carbon cycle.
Which critter trait is affected by an environmental factor, such as light, temperature, or
diet? Explain.
Answer:
Tallness.
Explanation:
Tallness is the critter trait that is affected by an environmental factor, such as light, temperature, or diet because the organism remains short if they are not getting food properly as well as temperature. Food provides essential nutrients that contribute in the growth of organism. Suitable temperature of the body allows the different functions in the body to be done which directly affects the growth of the body and the organism becomes taller.
Which of the following represents a normal
gamete?
A. Dd Rr
B. DRr
C. Dr
D. DdR
PLEASE HELP ME ITS REALLY URGENT,
WILL MARK AS BRAINLIEST!!
Answer:
C. Dr
Explanation:
Gametes only carry one allele for each trait
state 2 function of the kidney
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HERE IS UR ANSWER
_____________________
The kidneys are powerful chemical factories that perform the following functions:
remove waste products from the body.remove drugs from the body.balance the body's fluids.release hormones that regulate blood pressure.produce an active form of vitamin D that promotes strong, healthy bones.What happens to predator populations when prey populations are scarce? Why?
Which of the following statements correctly identifies and describes the type of covalent bond found between
oxygen and hydrogen in water molecules?
hydrogen bonds because hydrogen is more electronegative than oxygen
O polar covalent bonds because oxygen is more electronegative than hydrogen
O polar covalent bonds because hydrogen is more electronegative than oxygen
Answer: O polar covalent bonds because oxygen is more electronegative than hydrogen
Explanation:
In the water molecule the two hydrogen atoms and one oxygen atoms forms the chemical structure in this the covalent bond is formed between hydrogen and oxygen and this is formed due to sharing of electrons between hydrogen and oxygen and oxygen being electronegative requires two electrons to complete its valency which are provided by two electrons each from one hydrogen and the O polar covalent bond is formed by this way.
Answer:
d
Explanation:
edge 2020
How does the structure of a seed help to ensure the growth and
survival of the plant?
Answer:
Outer shell for protection, preventing any germs / orgasims / bugs getting into it?
Explanation:
Guess
Write down Gibbs energy equation and indicate which one is change in enthalpy
A phospholipid . Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a has both polar and nonpolar regions b is made up of a triglyceride bonded to a phosphate group c is a building block of ATP d can donate both cations and anions in solution
Answer:
A phospholipid
a. has both polar and nonpolar regions.
Explanation:
Phospholipids, as amphipathic molecules, consist of a glycerol molecule, two fatty acids, and a phosphate group that is modified by an alcohol. The phosphate group is the negatively-charged hydrophilic (water-loving) polar head, which face outward and are attracted to the intracellular and extracellular fluid. The fatty acids are the uncharged, hydrophobic (water-fearing) nonpolar tails, which face the inside, away from the water and meet in the inner region of the membrane.
An example of a consumer gaining chemical energy is:
O A. a baby bird hatching from an egg.
B. a deer drinking water from a stream.
C. a bear eating a salmon.
D. a dog chasing a rabbit.
Answer: C
Explanation: a bear eating a salmon.
During which days of the menstrual cycle does the level of FSH increase?
Explanation:
During the first week after menses (in a 28 days cycle), FSH continues to increase, the follicles grow intensely and FSH increases the expression of its own receptor and of the LH receptor on the granulosa cells.
7. Based on their shape, how would you classify these Fungi? (Which Division do they fit?) I would classify them as sac fungi
Answer:
To match the features and characteristics.
Explanation:
We can classify these Fungi on the basis of their features and characteristics that resembles to the different divisions of fungi. Fungi are classified in four divisions i.e. the Chytridiomycota (chytrids), Zygomycota (bread molds), Ascomycota (yeasts and sac fungi), and the Basidiomycota (club fungi). There are specific characteristics of every division of fungi so we have to match the physical features of unknown fungi with these divisions and classify them.
Identify the molecule that is not a compound
Answer:
dear, your question seems to be incomplete.......plz ask it again
a) explain covalent bond and hydrogen bond with an example of each (4marks)
b)state three(s) importance of surface tension and example( 6marks)
Answer:
Covalent bond is a primary chemical bond formed by the sharing of electron pairs. Covalent bonds are strong bonds with greater bond energy. Hydrogen bond is a weak electrostatic attraction between the hydrogen and an electronegative atom
