Which test tube in the experiment best represents a normal stomach?
A. Protein + hydrochloric acid
B. Protein + pepsin
C. Protein + pepsin + hydrochloric acid < (I think?)
D. Protein + water
Which organelle serves as Cell City's police? (This is an analogy)
A) ER (Endoplasmic Reticulum)
B) Golgi Complex
C) Lysosome
D) Chloroplast
Answer:Lysosomes
Explanation:
A farmer decides to test whether or not a fertilizer will make her crops grow bigger. In year 1, she plants corn in two different fields on her property and fertilizes one and not the other. She measures the height of 10 corn plants in meters from each field. She takes her measurements every week for three months. In year 2, she puts irrigation in one of the fields and conducts the same experiment.
Required:
a. What is the independent variable and the treatments (increments) used in the experiment?
b. What is the dependent variable and the units in which it was measured?
c. Name at least two controlled variables:
d. What is the hypothesis?
e. Identify two sources of error in the first year in the experiment:
f. Identify two sources of error in the second year in the experiment:
Answer:
a. independent variable: the fertilizer.
treatments: the use of fertilizer in one of the fields.
b. dependent variable: the crop growth in height.
units: meters
c. two controlled variables: soil pH / solar-radiation exposure, and water supply
d. hypothesis: the fertilizer makes the crops grow bigger.
e. two sources of error in the first year:
the researcher might plant the two crops under different conditionstake wrong measures of the height of the cornsf. two sources of error in the second year:
she can fail in irrigating the crops climatic and environmental conditions might change and have different consequences on each of the fields (this source affects the results influencing the growth of the plants).Explanation:
Independent (manipulated) variable: Refers to all the variables in an experiment that provoke a response in another variable. An independent variable is the one that changes or is controlled and modified in the experiment to analyze how another variable responds to it. These changes allow analyzing its effects on the dependent variable. Usually, the independent variable is represented by the X letter. In the exposed example, the fertilizer is the independent variable. Treatments: Refers to the experimental procedure applied in the experimental group. In this example, the use of fertilizer is the treatment. Here the experimental group (the one that receives the experimental procedure, with changes in the independent variable) is the fertilized field. Data from the experimental group is compared with the data from the control group, to analyze the effects of the fertilizer.Dependent variable: The values of these variables respond to any change in the independent variable. It represents the quantity of something. The change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. It is usually identified by the letter Y. In the exposed example, the crop growth rate in height is the dependent variable, that depends on the fertilizer used in that field. The units in which the crop is measured are meters in height. Controlled variable: Refers to those variables equally applied to every group or subject in an experiment and have no influence on the results. These variables do not affect the change in the dependent variable values. In the exposed example, soil pH and solar-radiation exposure can be two controlled variables, as they must be equal for both fields. Water supply by irrigation ducts during the second year in both fields is also a controlled variable. Hypothesis: A hypothesis is a possible answer for a question, a speculation that is not verified yet and requires corroboration. A hypothesis must express what is expected to occur in a perfectly comprehensive manner. It must be objective and directly related to variables. In this example, the hypothesis might be that the fertilizer makes the crops grow bigger. Errors: These are the differences between the observed data or taken values and what is really happening in nature, which can lead to a misinterpretation of what is actually going on. These errors might be systematic mistakes performed by the researcher when measuring, taking data, applying the treatment, etc. Or they might be due to random errors, which are due to failures in the instrumentals, changes in the environment, a single mistake of the researcher while taking measures, among others. During the first year, the researcher might plant the two crops under different conditions (parcels with different slopes which affect solar-radiation) or might commit a mistake while applying the fertilizer (different concentrations for example), or might take wrong measures of the height of the corns. During the second year, she can fail in irrigating the crops correctly, providing more water to one of the fields. She can commit the same measuring mistakes. Or even climatic and environmental conditions might change and have different consequences on each of the fields.What is a basement membrane
Answer:
which are present in the cell
Explanation:
of body in the base of kidney
Within the skeletal system, fat is commonly stored in the
Answer:
marrow
Explanation:
Additionally, the yellow marrow, which is found in the central cavity of long bones along with red marrow, serves as a storage site for fat.
Which of the following is a primary source?
O Annotated bibliography
O Encyclopedia
O Diary
O Literature review
Answer:
A diary is a primary source
What are the correct genotype percentages?
OGG=25%, Gg=50%, gg=25%
O GG=0%, Gg=100%, gg=0%
GG= 75%, Gg=0%, gg=25%
1. The hypothalamus in the human brain is involved in thermoregulation of the body.
This organ has been compared to a thermostat that uses a negative feedback
mechanism to control the heating and cooling in a house. Explain whether or not this
comparison is accurate. Justify your response. (3 points)
Answer:
the character of myth story has been the subject in many cases since the early stages in which is magstorya and a man with an old friend and an e
what is the power house of the cell
Mitochondria!!!!!!!!!!!
hope this helps!
Answer:
mitochondria
Explanation:
its tbe power house cell
1. What is a scientific investigation?
Answer:
A scientific investigation is a plan for asking questions and testing possible answers. A scientific investigation typically begins with observations. Observations often lead to questions. A hypothesis is a possible logical answer to a scientific question, based on scientific knowledge.
Explanation:
The second generation of a purebred cross of a h.o.m.o.zygous recessive organism, with a h.o.m.o.zygous dominant organism, contains a ratio of approximately ____ expressed dominant traits to recessive traits.
a. 1:1
b. 1:3
c. 2:1
d. 3:1
Answer:
d. 3:1
Explanation:
A purebred organism is an organism that contains identical alleles for a particular gene e.g rr or RR. According to this question, in a cross between a purebred dominant organism e.g RR and a purebred recessive organism e.g rr, each parent will produce R and r gametes respectively.
Using the gametes in a punnet square (see attached image), a heterozygous organism (Rr) will be produced in the F1 generation. If these heterozygous organism is self-crossed i.e. Rr × Rr, the following F2 offsprings will result;
RR, Rr, Rr, and rr.
RR, Rr and Rr will exhibit dominant traits while rr will exhibit recessive traits. This means that the F2 generation contains a ratio of approximately 3:1 expressed dominant traits to recessive traits.
1.)Suggest why slow skeletal muscle fibres are small in diameter. 2.)The toxin curare was discovered in South America, where it was used to tip poison darts. It works by competing with acetylcholine for the receptors on the postsynaptic membrane. Predict the effect of curare on muscular contraction. Explain your answer.
Answer:
1, to strengthen the bone
2, I would say it causes them to tense up (contract)
What is water current so
Answer please! have a great day/night
Answer:
C= gene
U too have a great day/night.
Explanation:
Which of these forms when air moves in the directions shown by the arrows
in the diagram?
A. Sea breeze
B. Valley breeze
C. Mountain breeze
D. Land breeze
Answer:
D. Land Breeze
Answer:
its land breeze
Explanation:
Why does the body use an RNA to leave the nucleus and give the message of the DNA to the ribosome?
ribosomes which make proteins are not found inside the nucleus but on endoplasmic reticulum and in cytoplasm. DNA creates RNA to do this job of leaving nucleus and delivering genes so that proteins are created.
Giving Everything!!!PLzzz help!!!
The process of transcription is known to have a less effective “proofing” stage to check the sequence of bases than does the process of DNA replication. What effect does this have on the base sequences produced by transcription?
A.Errors in the base sequences will result in a damaged strand of DNA.
B.The base sequences of mRNA can be exactly the same as those on DNA.
C. It is more likely that there will be more errors in coding base sequences in mRNA than there will be in DNA.
D. It is more likely that there will be fewer errors in coding base sequences in mRNA than there will be in DNA.
How fast was the toy car traveling if it went 275 ft in 25 seconds?
Biochemists working with proteins use a diverse set of treatments to analyze protein sequences. Denaturing agents unfold proteins. Some denaturing agents are reversible, and allow the proteins to be renatured after the procedure. A strong________ solution is a common reversible denaturant. Additional treatment with____________completely denatures proteins that contain disulfide bonds.
Answer:
Ethanol2-mercaptoethanolSee explanation below
Explanation:
Biochemists working with proteins use a diverse set of treatments to analyze protein sequences. Denaturing agents unfold proteins. Some denaturing agents are reversible, and allow the proteins to be renatured after the procedure. A strong ethanol solution is a common reversible denaturant. Additional treatment with 2-mercaptoethanol completely denatures proteins that contain disulfide bonds
A strong UREA solution is a common reversible denaturant. Additional treatment with 2-mercaptoethanol completely denatures proteins that contain disulfide bonds.
Denaturing reversible agents can alter the secondary/tertiary structure of a protein without altering its primary structure.Urea is a reversible denaturant that breaks hydrogen bonds in the secondary structure of proteins without modifying the primary structure.2-mercaptoethanol is a denaturing agent that cleaves disulfide bonds between cysteine residues.In conclusion, a strong UREA solution is a common reversible denaturant. Additional treatment with 2-mercaptoethanol completely denatures proteins that contain disulfide bonds.
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A border collie breeder raised border collies for herding cattle. She has 50 dogs, and lets them breed randomly. She has noticed that some of her puppies are being born with blue eyes. None of her parents have blue eyes. Out of 150 puppies born this year, 35 had blue eyes which is a recessive trait. How many of the other puppies are likely to be carriers of the gene?
Answer:
20?
Explanation:
!!!!!!HELP PLS I NEED ASAP ITS TIMED
Answer:
in order going from the top to the bottom.
water is compound composed of three atoms
- 1 Hydrogen, 2 oxygens
Cohesive
Because water is a polar molecule it is a good solvent
sweating can have a cooling effect due to evaporation. this is becayse energy is needed to break waters hydrogen bonds.
Frozen water is less dense than liquids water causing ice to float
Explanation:
What does relative humidity measure?
Relative humidity (RH) (expressed as a percent) also measures water vapor, but RELATIVE to the temperature of the air. In other words, it is a measure of the actual amount of water vapor in the air compared to the total amount of vapor that can exist in the air at its current temperature.
In comparison to the greatest amount of moisture that might be present at that temperature, relative humidity measures how much moisture is really in the air.
The amount of moisture in the air as compared to the maximum amount that might exist at given temperature is measured as relative humidity. It shows how saturated the air is with water vapour and is given as a percentage. A greater relative humidity signifies that the air is drier and is more likely to be approaching its maximum moisture-holding capacity than a lower relative humidity.
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Because of a snowstorm, your regular laboratory session was cancelled and the gram staining procedure performed on cultures incubated for a longer period of time. Examination of the stained B. cereus slides revealed a great deal of color variability, ranging from an intense blue to shades of pink. Account for this result.
Answer:
Bacteria start to die, thereby changing the dye concentration in the medium and producing different colors
Explanation:
Bacillus cereus are Gram-positive, rod-shaped bacteria that form orange-pink colonies in agar media (e.g., BACARA medium, which is used for detection and enumeration of B. cereus). In this case, it is expected that after a long time without taking care of the culture, the bacteria started to die. Subsequently, lysed bacterial cells lost their dye which accumulated in some areas of the medium, thereby showing different colors ranging from an intense blue (areas with dead bacteria) to shades of pink (areas with bacteria still alive and viable).
The color of some colonies are changing bacause of long incubation due to death of bacteria.
Bacara agar medium:
It is used for detection and enumeration of B. cereus. Bacteria gives orange-pink colonies in the media.
This detection method only detects the live bacteria, but here bacteria are dieing because of lake of food in media.
Therefore, the color of some colonies are changing bacause of long incubation due to death of bacteria.
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Please help asap, I will give brainliest!!!
Define biodiversity and describe how biodiversity (the variety of life in a particular habitat or ecosystem) helps keep an ecosystem healthy.
Answer:
Biodiversity is a variation of organisms (plants, animals and bacteria) in the world or a specific habitat. Biodiversity helps to keep an ecosystem healthy because there is more variation of food and different organisms can rely on each other for survival. Also it offers a larger more reliable food chain and if one species is suddenly wiped out, it won't impact the ecosystem as much as it would if the biodiversity was smaller.
Explanation:
What is the genotype of an organism?
A.
Its physical traits
B.
Its genetic make up (or DNA sequences)
In a typical barrel of oil, roughly what percent will be refined into gasoline?
5
10
15
20
25
Answer:
20%
Explanation:
The eye color of children often resembles the eye color of their parents. Which of the following is genetically passed from parents to children?
A. Particles of color are passed from parents to children.
B. Cells that become the colored part of the eye are passed from parents to children.
C. Nothing having anything to do with eye color is passed from parents to children.
D. Molecules (DNA) that contain the information that determines eye color are passed from parents to children.
Answer:
D
Explanation:
It is transferred as heredity.
Molecules (DNA) that contain the information that determines eye color are passed from parents to children.
Parents pass there genes to there offspring which helps in determining there phenotype.What are genes?A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. Many genes do not code for proteins.What are proteins?A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Proteins are present in all living organisms and include many essential biological compounds such as enzymes, hormones, and antibodies.
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____ muscle is voluntary and straited; _____ muscle is involuntary and non striated?
Answer:
Skeletal muscle is voluntary and striated, cardiac muscle is involuntary and straited and smooth muscle is involuntary and non-striated
Explanation:
hope it helps :)
Answer: Skeletal; cardiac
-Smooth muscle is involuntary and non-striated.
Explanation: Hope this helps, have a great day :D
Which describes how the atoms in living things cycle?
Multiple choice question.
A)
through living parts of ecosystems only
B)
in one direction from living to nonliving parts of the ecosystem
C)
in one direction from nonliving to living parts of the ecosystem
D)
repeatedly back and forth through living and nonliving parts of the ecosystem
Answer:
D) repeatedly back and forth through living and nonliving parts of the ecosystem
Explanation:
Matter is contained in both living and non-living components of the Earth. An atom is the smallest indivisible component of every matter. This means that matter is made up of atoms.
In an ecosystem, organisms feed on one another in order to survive. However, as they do this, matter is transferred from one organism to another. This transfer of matter (atoms) occurs repeatedly repeatedly back and forth in a cyclical manner through living and nonliving parts of the ecosystem.
A pea plant with round seeds (RR) is crossbred with another pea plant with wrinkled seeds (r).
What is the probability of producing offspring with genotype Rr?
25%
50%
75%
100%
Answer:
100%
Explanation: