B allow carbon to enter an ecosystem through photosynthesis.
D release water into the atmosphere through transpiration.
When a woman goes into the first stage of labor, the oxytocin level in her plasma is 40 pg/ml, but during the second
stage of labor it is 123 pg/ml. Once the baby has been delivered the mother's oxytocin level is 64 pg/ml. Which type of feedback
mechanism is occuring?
A. Negative feedback
B. Positive feedback
Answer:
Positive Feedback
Explanation:
A positive feedback mechanism occurs in a contraction of uterus during childbirth.
What is a feedback mechanism?"It is a physiological regulation system in a living body that works to return the body to its normal internal state (or homeostasis)."It is of two types: positive feedback mechanism and negative feedback mechanism.In positive feedback mechanism: when activation of one component leads to the activation of another, it is known as positive feedback.
Example: During childbirth, the oxytocin level of a women into her first stage of labor is 40 pg/ml for uterine contraction, which activate more release of oxytocin for further contraction.In negative feedback mechanism: when activation of one component leads to the inactivation of another, it is known as negative feedback.
Example: when blood glucose level increase, the insulin are secreted which lowers the glucose level in blood.Hence, the correct option is: B. Positive feedback.
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in photosynthesis, what three things enter from outside the plant?
Answer:
the three thing which enters in leaves during the process of photosynthesis are
i) water
ii) carbon dioxide
iii) raw material of photosynthesis
hope it's helpful :)
Match the level of ecological organization
described by each of the statements below.
The birds, insects, plants, fungi, and other
organisms that reside in a nearby wetland.
A. Molecules
B. Organism
C. Population
D. Biological community
OA
B
O
C с
D) Biological community
Explanation:
Community, also known as a biological community, is a group of interacting organisms that share a shared habitat in biology.
What is Biological community?
A biological community is made up of things like a forest of trees and underbrush plants that is home to various animals and is anchored in bacterial and fungal-rich soil.
Each species in a community fills a certain ecological niche. A species' interactions with other individuals in the community, such as rivalry, predation, parasitism, and mutualism, are included in its niche.
The positions along the food chains that indicate which organisms in a community consume which other organisms are referred to as trophic levels.
Therefore, Community, also known as a biological community, is a group of interacting organisms that share a shared habitat in biology.
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Scenario: In the experiment shown, plant A received 50 mL of coke each day,
plant B received 50 mL of juice, and plant C received 50 mL of water. Every
day for one week, plant growth was measured.
What is the independent variable? *
Answer:
TYPE OF LIQUID SUBSTANCE RECEIVED
Explanation:
The independent variable in an experiment is the variable that the experimenter deliberately changes or manipulates in order to bring about a response in the dependent variable/measured variable.
In this experiment, the TYPE OF LIQUID was changed for each group of plant in order to see how it affects how the plants grew. Hence, the TYPE OF LIQUID is the independent variable while the dependent variable is the plant growth, which is dependent on the independent variable.
Line graphs that indicate time along the x-axis can be used to predict what would happen to dependent variables in an
experiment at a later point in time
O only if the existing line shows an upward trend.
only if the existing line shows a downward trend.
Of a new variable was introduced to the experiment.
O if the experiment continued under the same conditions.
Answer:
D
Explanation:
Line graphs that indicate time along the x-axis can be to predict if the experiment continued under the same conditions. The correct option is D.
What are variables?A variable is a value that can change in programming in response to conditions or information passed to the program. A typical program consists of data used by the program while it is running and instructions that tell the computer what to do.
Variable values are typically initialized to "0" or some default value because the actual values will be supplied by a program's user, and constant or fixed values, which never change, make up the data.
Constants and variables are typically referred to as particular data types because each defines and restricts the data's form. These are some examples of data types: an unrestricted string of text characters or an integer expressed as a decimal number.
Therefore, the correct option is D. if the experiment continued under the same conditions.
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carbon fibres in tennis racket
Answer:Improvements in the carbonisation of viscose fibers. While maximum theoretical carbon yield for the carbonisation of viscose fibres is 44%, in reality the carbon yield is just in the range of 20%. ...
ELG Carbon Fibre receives ISO standard. ...
Porous carbon fibers have more power.
When Skeletal muscle contracts an arrangement of the alternating light and dark bands traversing each skeletal muscle cell changes. Which of the following statements is not correct?(a) The dark A bands will remain a constant length(b) The space occupied by the H zone will not change(c) The light I bands will shorten(d) The z lines come closer together(e) The I band consists solely of thin actin filaments
Answer:
(b) The space occupied by the H zone will not change
Explanation:
The sarcomere is the contractile unit in a skeletal muscle.Thick myosin myofilaments are located in the central region of the sarcomere, which corresponds to the A band. Thin filaments united to the Z lines, extends to the interior of the A band until they reach the border of the H band. I band is formed solely of thin actin filaments, belonging to two sarcomeres adjacent to a Z line. (option (e) is correct)When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in length of the sarcomere. The H line and the I band get shorter (Option (b) is not correct, but option (c) is correct). The Z lines get closer to the A band, meaning that they get closer to each other (Option (d) is correct). A band keeps constant in length (Option (a) is correct)This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.A student will measure and record the growth (in height) of two flowering plants every other day for 20 days. Each plant will receive 200mL of water each day, but only one plant will receive 10mL of fertilizer. What is being tested? Do flowering plants grow better with salt water? Does fertilizer help a plant grow taller? How tall do these flowering plants grow? How much fertilizer do flowering plants need?
Answer:
Does fertilizer help a plant grow taller?
Explanation:
Every experiment begins with an observation, which then leads to a scientific question that can be tested. In this question, a student measures and records the growth (in height) of two flowering plants every other day for 20 days. He then waters each flowering plants with same amount of water (200mL) but adds 10mL fertilizer to only one group of flowering plant.
This experimental set up implies that fertilizer is the independent variable or manipulated variable of the experiment while the dependent/measured variable is the growth (height) of plants.
N.B: 200mL of water is a constant or controlled variable
Hence, based on the identification of the independent and dependent variables, it can be said that the student is testing IF fertilizer will improve the growth in height of the flowering plants, hence, the scientific question will be: DOES FERTILIZER HELP A PLANT GROW TALLER?
I could use some help! 30 points!
An investigation is carried out into the effect of temperature on the activity of lipase. Separate tubes of substrate solution and enzyme solution are left in temperature-controlled water baths for ten minutes before mixing. Why is this done?
A- To activate the enzyme.
B-To allow time for the enzyme and the substrate to react.
C- To control the independent variable.
D- To keep a standardized variable constant.
Help is always appreciated, thank you!
Answer:
not sure maybe b it sound right otherwise sorry
True or False??? Help A substance in which other substances dissolve is called a solute.
Answer: false
Explanation:
Solute is the substance that dissolves
Solvents is the substance that dilutes dissolve in to make a solution eg ocean water is a solution of salt and water
Water being the solvent and salt being the solute
Which of the following is a prediction created based on the background information and observations?
a. Data
b. Conclusión
c. Deductive reasoning
d. Hypothesis
The diagram shows structures that represent different levels of organization in a human. Which is the second smallest level of organization?
Answer:
Z
Explanation:
B
Explanation:
It just is
Humanity’s ecological footprint is already overburdening the Earth, but, approximately 1/3 of the world population lives on less than $2 per day. What are some possible solutions to providing sufficient resources for everyone without causing ecological collapse?
Answer:
Use of recycled products and renewable energy.
Explanation:
Use of recycled products and use of renewable energy are the solutions which provide resources to everyone and no damage cause to the ecological systems of the environment. By using recycled products have two advantages i. e. the product's price decreases and no pollution occurs while the use of renewable energy such as use of solar radiation for the production of electricity. With this energy, no pollution occurs in the environment and electricity can be provided to a lot of people with low cost.
). How many total electrons does a neutrally charged carbon atom contain in its orbits? How many electrons are in its innermost orbit (closest to the nucleus)? How many are in its outermost orbit?
Answer:
6 electrons
2 electrons
8 electrons
which is worst type of oil
Answer:
the worst type of oil is olive oil and corn oil
Answer:
Palm oil
Explanation:
Although palm oil is considered to be one of the most sustainable crops of its type, it is a also $40,000,000,000 industry notorious for the detrimental damages it has caused to the environment. Here are some examples of the effects its industry has had on nature:
wiped out multiple rainforestsdisplaced several indigenous tribesruined shelter of endangered speciesHopefully you are getting the picture that science is a dynamic process, always changing as new information arises. Any individual experiment may include one or more of the components that have been discussed because there is no one formula for a successful scientific inquiry and no single rule book that is rigidly followed. So what does all this experimentation and data collection lead to? Firstly, research results have no impact if they are not shared with a community of peers and eventually society as a whole. Scientists working in the same research area often check each others results by repeating similar experiments. There is a great deal of both cooperation and competition in the scientific community. Contrary to popular belief science is in fact an incredibly creative process, that includes elements of challenge, surprise, careful planning, patience and persistance. It is the inquisitive mind that drives scientific progress.
Now that you have been more thoroughly introduced to the nature of science, lets try that survey from the beginning of this unit again.
1. A scientific hypothesis is best described as an "educated guess."
2. Failure to disprove a hypothesis proves that the hypothesis is correct.
3. Scientific theories are never questioned.
4. A scientific theory is based on educated guesses and is not backed up by facts/data.
5. Scientists that contribute data that contradicts an established theory are not highly regarded in the scientific community.
6. In order for an investigation to be considered scientific, a controlled experiment must be used.
7. Scientific facts are never questioned.
8. Science can only answer questions about things that can be seen and observed.
9. Untestable hypotheses fall outside the realm of scientific inquiry.
Anyone can practice science, even if they don't have highly specialized scientific education and training.
Which of the above are true?
Experimentation and data collection provides solution to certain problems. It helps to solve an hypothesis formulated providing results and serve as guide for further experiments.
1. A scientific hypothesis is best described as an "educated guess." - False
2. Failure to disprove a hypothesis proves that the hypothesis is correct.- False
3. Scientific theories are never questioned.- False
4. A scientific theory is based on educated guesses and is not backed up by facts/data.-False
5. Scientists that contribute data that contradicts an established theory are not highly regarded in the scientific community.- False
7. Scientific facts are never questioned.-False
The True
6. In order for an investigation to be considered scientific, a controlled experiment must be used.- True
A control serves as a guide in an experiment as the experimental variable is tested with it to see the possible changes or outcome.
8. Science can only answer questions about things that can be seen and observed.- True
Science provides solutions to problem that have been identified, for which data are generated in respect to the problem identified and solutions are provided.
9. Untestable hypotheses fall outside the realm of scientific inquiry -True
An hypothesis should be testable, it is the problem statement that requires a solution.
what is the most important nutrient for energy?
What is unique about the deep ocean vents related to the factors for life to exist?
Which is the least important base in the anticodon? (Remember to count 5' to 3'!)
a) First
b) Second
c) Third
d) They are all equally important
Answer:
c
Explanation:
The least important base in the anticodon is the third base.
The first two bases of anticodons largely determine the amino acid that would be formed in most cases. The third base can be any of the purine or pyrimidine bases and the amino avid would remain the same. For example, the anticodon UCA, UCG, UCC, and UCU all code for the amino acid Serine.
The correct option is, therefore, c.
The disadvantages of inbreeding include ________.
Answer:
Explanation:
Inbreeding results which can increase the chances of offspring being affected by deleterious or recessive traits. This usually leads to at least temporarily decreased biological fitness of a population (called inbreeding depression), which is its ability to survive and reproduce.
What is a problem in science
A. It is something that should be fixed
B. Its a guess you make about why or how a natural phenomenon occurs
C. Its a question you want to answer
Is the hypothesis about ice cream scientifically testable?
Answer:
No, this is not a testable hypothesis.
Explanation:
Hypothesizing regarding ice cream flavor preferences and texture is not scientifically testable since it inquires for a subjective statement from the subject who would be taking part in the experiment. Scientific method is a set of objective steps taken to formulate some conclusion about an observation or a phenomenon.
Which of the following statements is true related to hormones that regulate blood calcium levels?
1. Calcitonin causes bone to be broken down. 2. Calcitonin is released by the parathyroid gland to help lower blood calcium levels. 3. Parathyroid hormone is released by the parathyroid gland to help lower blood calcium levels. 4. Calcitonin is released by the thyroid gland to help lower blood calcium levels.
Answer:
Calcitonin causes bone to be broken down.
Explanation:
Diploid eukaryotic cells have two haploid sets of chromosomes, one contributed by the mother, the other contributed by the father.A. TrueB. False
Answer:
True.
Explanation:
Diploid eukaryotic cells have two haploid sets of chromosomes, one contributed by the mother, the other contributed by the father because sexually producing organisms like humans normally have diploid set of chromosomes which is contributed each by the two parent. The cells in humans that that are haploid set of chromosomes are the sex cells which is egg and sperm.
The egg and sperm fuse to together through reproduction a d fertilization occur when the sperm fertilizes the egg and the haploid set of chromosomes dude to form diploid set of chromosomes which is the offspring .
When an LDL particle is taken up by the cell, what impact will this have on the regulation of de novo cholesterol synthesis?
A. Transcription of HMG-CoA reductase will be elevated
B. SREBP will be inhibited by Insig in the endoplasmic reticulum
C. HMG-CoA reductase will be dephosphorylated
D. SREBP will be active in the nucleus
Answer:
C. HMG-CoA reductase will be dephosphorylated
Explanation:
When a low density lipoprotein particle is taken up by the cell, the impact it will have on the regulation of de novo cholesterol synthesis will be HMG-CoA reductase being dephosphorylated.
HMG-CoA( 3-hydroxy-3-methyl-glutaryl-CoA reductase) is an enzyme which aids the synthesis of lipids. When the lipids are produced and taken up by the cells then the effect of the synthesis stops to avoid excess synthesis and to allow for the action of enzymes which will act ok them in the cells . This is why it leads to a dephosphorylation of the enzyme which stops the action.
Humans autosomal cells have two copies each of 23 unique chromosomes. Match each cell division event and cell type according to the number of chromatids present.
23 Chromatids, 46 Chromatids, or 92 Chromatids
Spermatozoa
Ootid
Anaphase of mitosis
Oogonium prior to S phase
Answer:
Spermatozoa: 23 chromatids
Ootid: 23 chromatids
Anaphase of mitosis: 92 chromatids
Oogonium prior to S phase: 46 chromatids
Explanation:
1) Spermatozoa, also known as sperm cell is a haploid gamete (n) that results from the meiotic division of a dipoid reproductive cell. Since there are 23 pairs of chromosomes or 46 chromosomes in human somatic cells, there will be 23 chromosomes in the spermatozoa. Also, meiotic division occurs twice and separates sister chromatids in meiosis II. Hence, spermatozoa will contain 23 chromosomes (n) with 1 chromosome each i.e. 23 chromatids
2) Ootid is a haploid cell that arises from the second meiotic division of a secondary oocyte. A primary oocyte, with 46 chromosomes/92 chromatids, undergoes meiosis I to produce secondary oocyte with 23 chromosome/46 chromatids, which in turn undergoes meiosis II to produce ootid with 23 chromosomes/23 chromatids (each chromatid is an individual chromosome).
3) Mitosis is the cell division that produces two identical diploid (2n) daughter cells. Note that, 46 chromosomes get replicated to form 92 chromatids. In the anaphase stage of mitosis, sister chromatids get pulled apart to opposite poles but still remain in the cell as cytokinesis is yet to occur.
4) Oogonium is the diploid (2n) cell that gives rise to primary oocyte via mitosis. Prior to the S phase where chromosomes replication occurs, Oogonium cell will contain 46 chromosomes and 46 chromatids.
What type of rock is formed from cooling magma? Select all that apply.
Clastic
Marble
Basalt
Granite
magma is the rock that is formed underground so when it comes on earth it'll cool down and form marble
Which action is designed to increase the safety of a person carrying a microscope from one place to another?
putting a cover over the microscope
setting the microscope to the high-power objective position
wrapping the electrical cord around the arm of the microscope
raising the stage of the microscope until it touches the objective
Answer:
wrapping the electrical cord around the microscope
Explanation:
i took the test
The action that is designed to increase the safety of a person carrying a microscope from one place to another is as follows:
Wrapping the electrical cord around the arm of the microscope.Thus, the correct option is C.
What is a Microscope?A Microscope may be defined as a laboratory instrument that constructs an enlarged image of a small object such as cells and thus illustrating details too small to be seen by the unassisted eye.
In order to increase the safety of a person that holds a microscope and wants to shift it from one place to another via protecting by wrapping the electrical cord around the arm of the microscope.
The arm of the microscope is the place that is generally people hold when they carry a microscope from one place to another.
Therefore, the correct option for this question is C.
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When does DNA replication occur in a cell?
Answer:
DNA replication occurs in the S phase (The phase of DNA synthesis)
Explanation:
This replication of DNA occurs during interphase in the S phase. (2nd phase in the process).
Which of the following monomers vary based on the structure of their side chains?
Answer: Fatty acids. . Monosaccharides. . Nucleotides. . Amino acids. . What type of molecule is represented by the model below?. . -A molecule made up of four carbon rings with other atoms bonded to those rings-. . A.Fat. . B.Carbohydrate. . C.Steroid. . . D.Protein
Explanation: