Answer
La historia de la Tierra no ha sido una evolución gradual desde que nació hace más de 4.500 millones de años, como una bola incandescente, hasta el actual planeta azul lleno de una vida compleja y diversa.
why do scientists usually try to work without making the animals aware that humans are present
HELP ASAP PLEASE
Answer:
In animal field studies, why do scientists usually try to work without making the animals aware that the humans are present? It is necessary to observe the animals without disturbing them. When a controlled experiment is not possible, why do scientists try to identify as many relevant variables as possible?
The scuba diver is a living system. The scuba gear, or self-contained underwater breathing apparatus, is a system of air exchange. How are these two systems interacting? What are the inputs and outputs of these systems?
Answer:
Input: oxygen (or air generally), breathed in by the scuba diver
Output: carbon dioxide exhaled by the scuba diver
Explanation:
The scuba gear is absolutely essential to sustaining this activity by sea divers. It serves the purpose of recycling the air breathed out by the person by filtering out the carbon dioxide. It also makes up for the oxygen that gets used so that the diver can continue breathing in a circuit. Thus, oxygen is considered as input and CO2 as output in this case.
How many molecules of DNA would result from one molecule after five cycles of PCR?
OA. 14
B. 10
C.5
D. 32
Answer:
D
Explanation:
PCR, assuming sufficient primers, dNTP’s, and polymerase molecules, doubles the number of target DNA molecules per cycle. 5 cycles corresponds to 5 doublings of the target DNA. 2x2x2x2x2, or 2 to the 5th power is 32.
In a muscle twitch, which best describes what is happening during the latent period?
Answer:
During latent period, the muscle is preparing itself for contraction which comprises of biochemical activities from the stage acetylcholine bind to sarcolemma through cross-bridge formation.
Explanation:
A single muscle twitch has three stages which are latent period, contraction phase and relaxation stage
During latent period, the muscle is preparing itself for contraction which comprises of biochemical activities from the stage acetylcholine bind to sarcolemma through cross-bridge formation because the latent period is a short delay from the time the action potential get to the muscles until tension can be seen clearly in the muscle and the action potential is being propagated along the sarcolemma.
what happens during telophase
Answer:
Telophase is the fifth and final phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm.
Why are jenner's vaccine superior to previous methods for conferring resistance to smallpox?
Answer:
The risk of disease transmission is drastically low with his method, compare to the previous method with great tendency of transmitting diseases,which were lethal to the recipient.
Explanation:
He had noticed that milkmaids were only affected with cowpox,but are not affected with small pox.Thus he reasoned that they must have immunity against small pox.
Through his crude methods he extracted pus from a milkmaid who carried the virus for cowpox,and inserted this into the arm of a young through the opening created. After latent period of days he exposed the boy to the smallpox,and surprisingly he was not infected,thus the boy developed immunity to this virus which was related to the virus injected.
Thus he was able to develop immunity against the related diseases.
Besides he observed that this boy did not show symptoms of any other diseases or infection.
what is biology class
Answer:
Biology is the branch of science that deals with the study of living organisms and vital processes
Explanation:
I ♥️ Biology class
How does biology compare with other fields of science?
David suffers from a re-gurgitating mitral valve. this condition would cause:_______.a) increased cardiac output from the right ventricle. b) edema in the lower limbs. c) fluid congestion in the lungs. d) decreased heart rate. e) a bruit sound when ausculated with a stethoscope.
Answer:
The correct answer is: E) a bruit sound when auscultated with a stethoscope.
Explanation:
Mitral valve regurgitation is a condition in which the mitral valve - responsible for the blood flow from the left atrium to the left ventricle - doesn't close as tightly as it should, which can result in backward blood flow. If the condition worsens, this defect can lead to heart failure.
Mitral valve regurgitation may not have symptoms at first but, as the condition progresses, shortness of breath, fatigue, and palpitations can occur. When auscultated with a stethoscope, a bruit sound can be heard, which corresponds to the abnormal blood flow that is occurring.
what is the full form of RBC
A period in 24-point font (.) is about 1mm in diameter. SARS-CoV-2 has a diameter of 80 nm. The prefix “milli” means 1000, which tells you there are 1000 millimeters (mm)in a meter. The prefix “nano” means 109 (1 billion), which tells you there are 1 billion nanometers (nm) in a meter. Approximately how many SARS-CoV-2 viruses could fit in that period? (Hint: There are 106nm in 1mm).
Answer:
Approximately 12,500 SARS-CoV-2 viruses
Explanation:
According to this question, the period described is 1mm in diameter. Since 1millimetre(mm) is 1000metre(m), this means that the period is 0.001m in diameter.
Also, the SARS-CoV-2 virus has a diameter of 80 nm (1nm = 10^9m).
Since 10^6nanometres (nm) or 1,000,000nm makes 1millimeter (mm), 80nm of the virus will be:
= 80/1,000,000
= 0.000080mm or 8 × 10^-5mm
To calculate how many of the SARS-CoV-2 virus will fit into the period, we divide the diameter of the period (in mm) by the diameter of the virus (in mm).
That is; 1 ÷ 8 × 10^-5
= 1/8 × 10^5
= 0.125 × 100,000
= 12,500
Therefore, approximately 12500 SARS-CoV-2 viruses will fit in the period.
identify monomers and describe the function for all macromolecules
The first one is a lipid.
The second is a carbohydrate.
The third are nucleic acids.
Question 1 (2 points) BIOLOGY HELP PLEASEEEEEE! Scientists are conducting an experiment on a new specimen. They are trying to determine what it is made of. What indicator could they use test for the presence of proteins? Question 1 options: Iodine Benedict's Solution Biuret Reagent Paper Bag Test Question 2 (2 points) During our lab today, why was test tube five filled with water? Question 2 options: It was the experimental group. It was the control group. Water is the only substance that would react with all of the indicators. Water has reactive properties and would speed up reactions.
Answer:
Biuret Reagent Water is the only substance that would react with all of the indicators.Explanation:
g A ________________ gradient is directly used to provide the energy for ATP synthesis in the mitochondria.
Answer:
Elerochemical gradient
Explanation:This coccus during the process of chemiosmosis in oxidative phosphorylation during cellular respiration. It is the electrochemical gradient that provides the energy needed by ATPase Synthase for the phosphorylation of ADP tp ATP, necessary for ATP production
The electochemical gradient is due to gradient produced from the pumping of protons by the proton motive force(PMF) into the intrammenbrane space. from the matrix.The accumulation leads the the production of electrochemical gradients because the Protons diffuse across from higher gradient in the intramembrsne space into the lower concentration gradient the matrix.Therefore,energy is produced as the diffusion takes place.
The ETC, is the source of generation of PMF, which pumps protons across into the intramembrane, for the electrochemical gradients productions
Explain relationship between adaptation and evolutionary change
How many total atp are produced during aerobic respiration
The number of ATP molecules produced in aerobic respiration is 38 ATP molecules.
What is aerobic respiration?Aerobic respiration refers to the process by which the body breaks down food molecules in the presence of oxygen to produce energy for the body in the form of ATP molecules.
Aerobic respiration consists of:
glycolysisTCA cycleElectron transport chain.The number of ATP molecules produced in aerobic respiration is 38 ATP molecules.
In conclusion, aerobic respiration takes place in the presence of oxygen.
Learn more about aerobic respiration at: https://brainly.com/question/11691469
#SPJ1
A student conducted a well designed scientific experiment. Which of the following needs to happen in order for the results of the experiment to be widely accepted?
Answer:
Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or predictions.
ANSWER AND EXPLAIN PLZ:)
Answer:
The independent variable in the experiment is A. the jar covers.
Explanation:
The independent variable in an experiment represents the thing that the person conducting the experiment changes or alters. One group in the experiment had covers (this represents the experimental group) and the other group had no cover (this represents the control group which was not exposed to the independent variable). Since the only thing that Redi changed between the two groups was whether or not the jars were covered, this represents the independent variable.
The number of jars and the contents of the jars were constant in both experiments, and the number of maggots on the meat is the dependent variable (the result of changing the independent variable).
Hope this helps!
An enzyme inhibitor works with the enzyme in a chemical reaction. Which statement best describes how an enzyme inhibitor and an enzyme work in a catalyzed reaction? (5 points) a The enzyme inhibitor catalyzes the reverse reaction, which counteracts the work of the enzyme. b The enzyme inhibitor attacks and destroys the enzyme, which prevents the enzyme from helping in the reaction. c The enzyme inhibitor binds to the products of the reaction, which makes the work of the enzyme unproductive. d The enzyme inhibitor fits into the enzyme's active site, which prevents the enzyme from catalyzing the reaction.
Answer:
The correct answer is option D. The enzyme inhibitor fits into the enzyme's active site, which prevents the enzyme from catalyzing the reaction.
Explanation:
Enzyme inhibitors are the biochemical or chemical substance which hinders the role and function of the enzyme by binding to the active site of an enzyme.
These can be explained into two categories:
Irreversible inhibitors: They bound to the enzyme with the assistance of covalent bonds and alters the affinity of the enzyme towards the substrate by changing the state of the dynamic destinations.
Reversible inhibitors: Theses are the particles that bind to the enzyme's active site with the assistance of non-covalent bonds, for example, hydrogen bonds, hydrophobic bonds, and others.
Thus, the correct answer is : option D.
Answer:
D. The enzyme inhibitor fits into the enzyme's active site, which prevents the enzyme from catalyzing the reaction.
Explanation:
I got it "Correct"
Transport of D- and L- glucose proceeds at the same rate down an electrochemical gradietn by which ofhte following processes?
a. simple diffusion.
b. facilitated diffusion.
c. primary active transport.
d. cotransport.
e. counter transport.
Answer:
Explanation:
Active transport is the movement of molecules or substance from a region of lower concentration to a region of higher concentration across a cell membrane against the concentration gradient.
Active transport requires cellular energy and are of two types:
primary active transport that uses adenosine triphosphate (ATP), and secondary active transport that uses an electrochemical gradient.
Active transport helps in the uptake of glucose in the intestines.
Cotransport or secondary active transport is the movement of molecules across a membrane it uses electrochemical potential difference that is created by pumping ions in or out of the cell.
Cotransport helps in the transport of glucose across the cell membrane.
A single gene produces two different proteins, utilizing different exons. What is the most likely explanation?
Answer: Differences in mRNA splicing.
Explanation:
The exon is the region of a gene that is not separated during the cutting and splicing process and thus remains in the mature messenger RNA. In genes encoding a protein, it is the exons which contain the information to produce the protein encoded in the gene. In these cases, each exon encodes a specific portion of the complete protein, so that the set of exons forms the coding region of the gene. In eukaryotes, the exons of a gene are separated by long regions of DNA (called introns) which do not code.
RNA splicing is a post-transcriptional process of maturing RNA from which certain sequential fragments are removed. This process is very common in eukaryotes, and can occur in any type of RNA, although it is more common in mRNA. It consists of removing the introns from the primary transcript and then binding the exons. Particularly, alternative RNA splicing takes place when one gene can produce different proteins as a result of what segments are considered as introns and exons. When different segments are considered exons, the result is a great diversity of mature transcripts which produce different proteins.
So, gene splicing is a post-transcriptional modification in which a gene can code for many proteins, which makes it an important source of protein diversity.
What is the mass number of an ion with 109 electrons, 158 neutrons, and a +1 charge
Answer:
The mass number is 267.
Explanation:
It is given that,
Number of electrons are 109
Number of neutrons are 158
Charge is +1
We need to find the mass number of the ion.
We know that,
Mass number = No. of neutrons+ No. of protons
Also, No. of protons = No. of electrons = 109
So,
Mass number = 109+158 = 267
Therefore, the mass number is 267.
How does the production and availability of natural resources influence human activity?
Answer:
It influence human activity because, natural resources, we mostly use them in almost every day. Which is wood, water, oil, and etc those stuff and those stuff I named we use them almost every single day. And production, is like creating something like a building, which could be a office building for people and work there. I hope my answer helps you!
Explanation:
Which statement about conjunction is true
Answer:
Hello...
Conjunctions are words that unite or connect parts of a sentence.
Hope it's help :)
Classify each statement as an example of adhesion, cohesion, or surface tension. Drag each statement to the appropriate bin. A sewing needle floats when it is placed gently on top of water in a bucket. Water molecules ding to plant cell walls. A water strider runs across a pond without breaking the surface. A drop of water spilled on a table forms a drop on the table, rather than spreading out over the surface. Water molecules cling to the side of a beaker. Water molecules are attracted to each other.
Answer:
A sewing needle floats when it is placed gently on top of water in a bucket - surface tension
Water molecules ding to plant cell walls - adhesion
A water strider runs across a pond without breaking the surface - surface tension
A drop of water spilled on a table forms a drop on the table, rather than spreading out over the surface - cohesion
Water molecules cling to the side of a beaker - adhesion
Water molecules are attracted to each other - cohesion
Explanation:
The surface tension refers to the tendency of the surface of a liquid to remain unbroken by an external force due to the cohesive property of the molecules of the liquid. Instead of being broken, the surface of the liquid stretches like an elastic membrane.
The adhesive property of a liquid, also known as the force of adhesion, refers to the property of the molecules of the liquid to stick to other molecules while cohesive property or cohesion refers to the property of molecules of liquids to stick to themselves.
Hence,
Surface tension
A sewing needle floats when it is placed gently on top of water in a bucket.A water strider runs across a pond without breaking the surface.Cohesion
A drop of water spilled on a table forms a drop on the table, rather than spreading out over the surface.Water molecules are attracted to each other.Adhesion
Water molecules ding to plant cell wallsWater molecules cling to the side of a beakersimilar to protists, archaea can reproduce to generate two genetically identical daughter cells through
Similar to Protists, Archaea can reproduce to generate two genetically identical daughter cells through Binary fission.
What is Binary fission?Binary fission may be defined as a type of asexual reproduction in which an organism significantly duplicates its genetic content. According to this, the deoxyribonucleic acid (DNA), and then divides into two parts (cytokinesis), with each new organism receiving one copy of DNA.
According to the context of this question, binary fission is a mechanism of reproduction in simpler organisms through which a parent cell divides into two genetically identical daughter cells.
Archaea can also reproduce asexually through budding and fragmentation, where pieces of the cell break off and form a new cell, also producing genetically identical organisms.
Therefore, similar to Protists, Archaea can reproduce to generate two genetically identical daughter cells through Binary fission.
To learn more about Binary fission, refer to the link:
https://brainly.com/question/983753
#SPJ2
Which of the following best helps scientists determine the order in which a species evolved? A) Type of fossil B) Geographic location of the fossil C) Location of the fossil in Earth's layers D) Species of the fossil
Answer: I’m pretty sure it’s the geographic location of the fossil. B
Explanation: Because when they die they go into the ground but then more layers of earth for and different species are shown but at different depths.
In a number sequence, the numbers are known as the _______.
Answer:
repeating numbers
hope this helps you
What type of macromolecule would amylase be an example of? Nucleic Acid Carbohydrate Lipid Protein
Answer:
Enzymes (protein)
Explanation:
What kind of organic macromolecule is amylase? Amylase is a typical enzyme and like the vast majority of enzymes it is a protein.
Identify the eukaryotic cellular locations of the fundamental processes that are involved in the central dogma of molecular biology by dragging the correct labels to their targets.
Answer:
See the answer below
Explanation:
The central dogma gives a description of how genetic information travels in biological cells from DNAs to proteins. DNAs are first transcribed into messenger RNAs in a process known as transcription and the resulting mRNAs are used in the synthesis of proteins in a process known as translation.
In eukaryotic cells, transcription process happens within the confines of the nucleus because the genetic material in the form of DNAs are always located in the nucleus. Thereafter, the mRNAs generated from transcription are transported to the cytoplasm of the cell where they become translated into proteins.
Hence;
Transcription happens in the nucleus of the cell.Translation happens in the cytoplasm of the cell.