Answer:
True
Explanation:
Cell membranes are selectively permeable because of the structure of the phospholipid bilayer.
This bilayer only lets certain things in because it depends on the polarity, size, and type of molecule.
For example, glucose molecules are too large to enter. But, carbon dioxide molecules can go in and out easily because of their small size.
Answer:
This statement is True
“One way that a cell maintains homeostasis is by controlling the movement of substances across the cell membrane. The lipid bilayer is selectively permeable to small, nonpolar substances. Proteins in the cell membrane include cell-surface markers, receptor proteins, enzymes, and transport proteins.”
Are all compounds molecules
Answer:
Every combination of atoms is a molecule. A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds.
In a controlled experiment, which group experiences the test?
A. Instruments and equipment
B. Experimental group
C. Control group
D. Measurements and observations
Answer:
c. control group
Explanation:
hope it helps you
HELPPPPP MEEEEEEE!!!!!!!!!!!!!!!!!!!!!!!!!111
Answer:
Millimeters
Explanation:
Answer:
D
Explanation:
mm measures length in the smallest amount
According to most theories about the evolution of early life on earth, the atmosphere had an abundance of ammonia, methane, and carbon dioxide, shown above. Free energy from lightning could have allowed chemical reactions to occur that generated the precursors to life on earth. Which inorganic molecule(s) are accurately paired with their role in the formation of organic molecules necessary to life?
A) Ammonia would have provided the nitrogen found in the amine groups of amino acid and the nitrogenous bases in DNA.
B) Methane would have provided the hydrogen to form water, a universal solvent for chemical reactions supporting life.
C) Ammonia would have provided the electrons to generate ATP using an electron transport chain within the mitochondria.
D) Carbon dioxide would have provided the oxygen needed to perform photosynthesis, resulting in the production of glucose.
Answer:
A
Explanation:
The correct option would be A.
The presence of ammonia in the atmosphere of primitive earth provided the nitrogen found in the amine groups of amino acid and the nitrogenous bases in DNA. This has been proven through the simulation experiment of the primitive earth's atmosphere by Stanley Miller and Harold Urey.
The water in the primitive atmosphere was formed from the condensation of water vapour from volcanoes that were characterics of the earth's environment while oxygen in itself is not needed for photosynthesis but a by-product of it.
a and b are complementary angles a measure 59 degrees
Answer:
b = 31 degrees
Explanation:
Jenny is preparing a presentation about volume for her science class. She writes down the following notes about volume:
–Volume is constant for solids since they have a shape.
–Volume varies for liquids and gases since they do not have a shape.
–Volume may be measured in many ways.
–Common units of volume include cubic centimeters, milliliters, and liters.
When giving her presentation, Jenny notices there is a mistake in her notes. Which is the mistake in her notes?
Solids do not necessarily have a shape.
The volume for liquids is constant.
Volume is always measured using a graduated cylinder.
Common units for volume also include cubic grams.
Answer:
b
Explanation:
When water and mercury are placed in glass tubes, the water in the right tube)
adheres to the sides of the tube. The mercury (in the left tube) forms a rounded
surface at the top of the liquid. Which of these substances has greater cohesion
than adhesion? Explain your answer.
Answer:look at the image and everything’s on there
Explanation:
Mercury has greater cohesion than adhesion.
What is adhesion?The attraction between two distinct phases is known as adhesion. Adhesion cannot be explained by a single theory, however it is frequently split into two categories: mechanical interlocking and physical and chemical bonding. Adhesion often results from a mixture of the several mechanisms described below.
When two dissimilar phases only attach to one another mechanically, mechanical interlocking occurs. Typically, for the other material to penetrate, the surface needs to be a little bit rough. adhesion processes
For instance, a low viscosity glue that easily penetrates surface pores and fissures. After the adhesive has dried, this causes mechanical anchoring between the two components.
Therefore, Mercury has greater cohesion than adhesion.
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The image below is a model showing how chromosomes and DNA are structured within a cell.
W
X
Y
Z
Which letter represents a gene?
Answer:
Z is gene.
Explanation:
W is nucleus
X is chromosomes
Y is DNA
Describe the importance of chemical elements to living organisms
Answer:
Chemicals make up the bodies of living organisms, all require H20, cells consist of 75% water. Organisms are made of matter (composed of chemical elements). ... An element that is essential for life but required in small amounts.
Explanation:
Chemicals make up the bodies of living organisms, all need [tex]H_2O[/tex], cells that are 75% water. Organisms are made of matter which is made of chemical elements.
What are Chemical Elements?A chemical element is defined as a chemical substance that cannot be broken down into other substances where the fundamental particle of a chemical element is an atom, and chemical elements are distinguished from each other by the number of protons in the nuclei of their atoms. goes.
Carbon, oxygen, hydrogen, gold, silver and iron are examples of chemical elements where each element has only one atomic form. Elements can combine with each other to form a wide variety of more complex substances called compounds where the number of possible compounds is almost infinite where there are probably a million known and more are being discovered every day.
Thus, Chemicals make up the bodies of living organisms, all need [tex]H_2O[/tex], cells that are 75% water. Organisms are made of matter which is made of chemical elements.
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When a drug is discontinued, what percentage of that drug will remain in the body after three half-lives?
Answer:
About 12.5%
Explanation:
Every half life usually eliminates about half or 50% of drugs that is stored in the body system.
Therefore, after one half life, the percentage of drug stored in the body will be 50%, after two half lives it will be reduced by 50% which is 25%.
After three half lives, the percentage of drug stored in the body will also be eliminated by 50% which will be half of 25% and it will be 12.5%.
Therefore, the answer is 12.5%.
What are some non examples of environmental systems.
Machine operating is the non examples of environmental systems.
What is environmental systems ?The environmental system can be defined as an ecological sense as the set of interactions between the elements of the biosphere and it includes the atmosphere, the hydrosphere, the lithosphere, and the ecosphere.
The atmosphere is composed of nitrogen (78%), oxygen (21%), and other traces of carbon dioxide, argon, water vapor, Although the atmosphere is approximately 1,100 km high, the stratosphere and the troposphere are the main atmospheric interactors.
The hydrosphere consist of water in all form like solid, liquid, and gas and dissolved elements like sodium, magnesium, calcium, chloride, and sulfate.
The lithosphere which is a thin crust between the mantle and the atmosphere, it is around 100 km thick, it can be considered in interaction with the biosphere; Main components are oxygen, silicon, aluminum, iron, calcium, sodium , potassium and magnesium.
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Elizabeth was studying the history of the cell theory and the contributions of different scientists. She made this table to compare two of the scientists. X Y observed objects using a microscope observed small organisms using his own version of a microscope called what he observed "cells” called what he observed "animalcules” Which pair of scientists should Elizabeth write instead of X and Y? Schwann and Hooke Hooke and Schleiden Hooke and Leeuwenhoek Virchow and Schwann
Answer:
i just took this test and the answer is C
Explanation:
The pair of scientists should Elizabeth write instead of X and Y is Schwann and Hooke. The correct option is a.
What is the cell theory?A biological hypothesis asserts one or both of the following: an organism is made up of autonomous cells, and its qualities are the sum of those of its cells; the cell is the primary structural and functional unit of living matter.
Theodor Schwann was the scientist who proposed the theory of cells in 1839.
Because it hasn't been verified yet and there are no known means to verify it, the label “cell theory” is acceptable. However, given how many facts support this idea, it is thought to be accurate. It also backs a number of other theories derived from Cell Theory.
Therefore, the correct option is a. Schwann and Hooke.
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All of the following sciences contribute to Environmental Science
except.....
Biology
Chemistry
Engineering
Medicine
Answer:
medicine
Explanation:
medicine relates to the treatment of diseases/aliments of life.. environmental science can involve abiotic factors as well
3. Scientists must understand that
a. science cannot provide answers to all questions.
b. scientific ideas are fact, and can never be revised.
c. sound scientific ideas are frequently altered.
d. nature is a constantly changing wonder, difficult to understand.
Answer:
A
Explanation:
Scientists must be aware of this that science cannot offer solutions to every issue, hence option A is correct.
What is a scientific hypothesis?A hypothesis is a potential solution to a problem in science, but it isn't just any solution. A hypothesis needs to be rational and supported by scientific information.
Falsifiable claims must be made in science, this implies that they might be tested, and there must be some conceivable observation that may disprove them.
Therefore, a hypothesis or theory seeks to explain or interpret facts, but a scientific fact is, in its most fundamental definition, an objective and verifiable observation, hence option A is correct.
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How is a graph similar to a data table?
Answer:
they both hold data and show you a scale
What is the life cycle of a kakahi?
How were you able to determine if something was living, once living, or never living (non-living)?
Answer:
Must have lived before.
Explanation:
For an organism to be classified as once living, an object must have been part of a living organism or is now dead. When a flower is plucked from a plant it is hard to distinguish between when it is considered alive and when it is now considered once living. An example of a nonliving object is an apple or a dead leaf.Apr 22, 2013
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Nucleic Acids functions /short answer
Answer:
Nucleic acid is an important class of macromolecules found in all cells and viruses
Explanation:
How are fossils found
Answer:
Fossils are found in harsh depth and heights as they had decayed many.centuries ago
One of the most important bioethical issues facing us today is the issue of ____________ , or a loss thereof.
Answer:
The correct answer is - biodiversity.
Explanation:
Bioethics is a part of ethics that has concerns and problems with the continuous use and development of biological tools and technology which has a negative effect on the environment.
It is the single most important bioethical issue today that effect on the biodiversity that includes different type of lives present on earth in the various number of species.
Thus, the correct answer is - biodiversity.
PLEASE HURRY A student is interested in the behavior of fish. He has 4 identical fish bowls and 20 goldfish. He places 8 fish in one bowl, 6 in the next, 4 in another and 2 in the last. Each bowl is placed in a lighted room with a temperature of 75 degrees Fahrenheit and he observes the behavior of all of the fish. What is the independent variable in this experiment? a The number of fish in each bowl b The type of light c The behavior of the fish in each bowl d The temperature
Answer:
(a) number of fish in each bowl
Explanation:
independent or manipulating variable is what you can control in this situation the student can control how many fish are in each bowl
Branch that deals mostly with things that were never alive.
I think it's called "Inorganic Chemistry". In which it deals with compounds that do not contain carbon, but can sometimes contain hydrogen.
Hope this helps
what specialized cells are contained in the epithelial tissue?
Answer:
Explanation:
Particular structures found in some epithelial cells are an adaptation to ... a form of specialized stratified epithelium in which the shape of the cells can vary.
What is the expected result of a nation whose population is outstripping its resources and ability to feed its people, if its people cannot migrate peaceably?
Answer:
a lot of sickness, homelessness and deaths
Explanation:
make up some reasons for those. It's pretty self explanatory.
The expected result of a nation whose population is outstripping its resources and ability to feed its people, if its people cannot migrate peaceably - disease, habitat loss, and fatality.
Result of outstripping resources
If the nation is experiencing outstripping or loss of resources and ability to feed its citizens, and if they are not able to migrate peaceably that will result in diseases or sickness due to hunger, homelessness and illegally moving to different places.
Such a case is seen in Mexico where people move from south America for better livelihood as there is a scarcity of resources. This scarcity of food and resources leads to deprivation of shelter, a hunger that can lead to death as well.
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define capillaries.
Answer:
noun
plural noun: capillaries
1.
ANATOMY
any of the fine branching blood vessels that form a network between the arterioles and venules.
2.
a tube that has an internal diameter of hairlike thinness.
Explanation:
which metel is extracted from argentite ore
Answer:
Silver
Explanation:
Use the structure of a water molecule to explain why its is polar
which two
reservoirs are part of the
short-term carbon cycle?
Which contributes to a population at zero population growth? A) Deaths outpace births. B) Births outpace deaths. C) Carrying capacity is exceeded. D) Birthrate equals the death rate.
Answer:
D
Explanation:
both are equal to the is zero pop growth
What does the Big Bang theory suggest
Answer: The Big Bang theory basically explains how our universe began.
Our universe started with a small singularity, and inflated over the next 13.8 billion years to the cosmos we know
Please correct me if I’m wrong :)
Explanation: