A solution that is equal in solute concentration to that of the cytoplasm of a cell and causes a cell to neither lose nor gain water by osmosis is a(n)
Answer:
isotonic solution
Explanation:
The cell membrane is semi-permeable, so it allows to pass through certain solutes. By a process called osmosis, the water molecules move from a compartment of lower concentration of solutes to a compartment with higher concentration.
Therefore, if the concentration of solutes in the outside is higher than the concentration in the cytoplasm (hypertonic solution), the water molecules will move from the interior to the exterior. Conversely, if the cytoplasm is more concentrated than the outside (hypotonic solution), the water molecules will move from the exterior to the interior. If the cytoplasm has the same solute concentration as the outside, the solution of the outside is called isotonic, and no water net flux will be produced.
There are two main processes involved in producing a protein molecule from the information in DNA. Drag each tile to the correct location on the diagram to show how these processes work. Not all tiles will be used.
does the presence of introns exons in eukaroytic cells provide more potentia diversity in gene products than is possible in porkatroi cells
Answer: Yes. Splicing can be done in different ways to yield different mRNAs wich will create different proteins. Prokaryotes are not able to do this.
Explanation:
DNA (deoxyribonucleic acid) is a molecule that contains the genetic information for synthesizing amino acids that form proteins. To do this, DNA must first be transcribed into RNA (ribonucleic acid) and this is the molecule used for protein synthesis (translation). The newly transcribed RNA (called primary messenger RNA) from DNA results in a very long molecule and also has regions that do not code for anything, called introns, which are removed by a process called splicing. Exons are segments in the RNA that do code for amino acids and remain in the mature mRNA after splicing.
Splicing is a process by which introns are cleaved from the primary messenger RNA and exons are joined to generate mature messenger RNA. In addition, alternative splicing occurs which allows different mRNA isoforms and thus different proteins to be obtained from a primary mRNA transcript. This is because the exons will be joined or spliced in different ways, giving rise to different mature messenger RNA sequences. This process occurs mainly in eukaryotes, although it can also be observed in viruses. But it does not take place in Prokaryotes (Bacteria).
In summary, exons/introns can be spliced together in different ways to yield different mRNAs sequences. Each different mRNA sequence will code for a different protein.
When you did the Homeostasis Exercise Lab yesterday, what was the dependent variable?
A) Heart rate
B) Breathing rate
C) Both Heart rate and Breathing rate
D) Time
At each ______ foramen, the dura mater extends between adjacent vertebrae and fuses with the connective tissue layers that surround the ______.
Answer:
At each intervertebral foramen, the dura mater extends between adjacent vertebrae and fuses with the connective tissue layers that surround the spinal nerves.
Explanation:
The dura mater is the outermost meninge. It is around the spinal cord and the brain, and it protects these organs. In the spine, the dura mater extends between the intervertebral foramen. The intervertebral foramina are the areas between each vertebra that have spinal nerve projections. In these areas, the dura mater extends to seclude the space where the spinal cord is since it fusses with the tissue that is around each spinal nerve to stop the entrance of any pathogen to the spinal canal, which is the space that contains the spinal cord.
construct an explanation based on evidence for how the structure of DNA determines the structure of proteins which carry out the essential functions of life through systems of specialized cells
Structure and Function. All cells contain genetic information in the form of DNA molecules. Genes are regions in the DNA that contain the instructions that code for the formation of proteins, which carry out most of the work of cells.
the basic structural and functional unit of the living organism is
Answer:
cell
Explanation:
The cell is the fundamental unit of structure and function in living things. All organisms are made up of one or more cells. Cells arise from other cells through cellular division.
Which scenario describes unethical lab behavior?
A.
Danny stores the chemicals required for his experiment in flasks and beakers.
B.
Anna publishes the results of her experiment on the growth rate of saplings.
C.
Jason repeatedly runs an experiment until he gets the results he desires.
D.
Mia records her observations of an experiment precisely and accurately
Answer:
A. Danny stores the chemicals required for his experiment in flasks and beakers.
Explanation:
It is unsafe to store chemicals in open containers such as, a flask or beaker.
Which of the following statements helps support the endosymbiotic theory?
Choose 1 answer:
A
All cells contain ribosomes that conduct protein synthesis.
B
Cells contain genetic information in the form of DNA.
If isolated from a eukaryotic cell, mitochondria can no longer survive and reproduce on their
own.
If isolated from a plant cell, a chloroplast can survive and reproduce on its own.
Answer:
C. If isolated from a eukaryotic cell, mitochondria can no longer survive and reproduce on their own.
Explanation:
The endosymbiotic theory proposes that early eukaryotic cells evolved from endosymbiotic interactions among prokaryotic cells. This theory states that mitochondria and chloroplasts were once primitive bacterial cells that were ingested by large anaerobic prokaryotic cells, and then these cells benefited from living and working together. The most important lines of evidence that support this theory are that mitochondria and chloroplasts contain their own genetic material (circular DNA) and their own protein biosynthesis machinery (ribosomes).
Different types, or isotopes, of oxygen exist in the ocean and are incorporated into the skeletal fragments of animals. What can the ratio of preserved isotopes tell us about climate?
Answer:
The correct answer is - Certain ratios of oxygen reflect either warmer or cooler ocean temperatures.
Explanation:
Ocean have different isotypes or types of oxygen throughout the ocean and also incorporated in the shells of the marine animals of the particular region and time.
We can found out the climate and more particularly the temperature of the ocean as The more 18^O found in the shell or sediment of the animal, the colder the climate and vice versa, however, it is opposite in relation to that of glacier ice.
What does hydra mean ?
what happens at the end of translation?
Answer:
Translation ends in a process called termination.
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Raghavan has two identical plants. He plants one outside in the ground. The other is growing indoors without direct light. Raghavan predicts the weight of the carbon dioxide and water taken in by the plant and the oxygen given off by the plant.
Raghavan notices that a rabbit family has been eating the outdoor plant and that small insects are eating the indoor plant. He sees a fox hunting rabbit, but nothing is eating the insects.
The diagrams show Raghavan’s plants. Raghavan predicted the weight of carbon dioxide and water taken in by the plant. He predicted the weight of oxygen given off by the plant. What should he predict for the weight of the sugar the plant made?
A. 1.80 gram
B. 3.46 gram
C. 3.72 gram
D. 5.64 gram
Answer:
be honest, the correct answer is 1.80 gram
Explanation:
i really need help... i skipped my lessons and i will mark brainliest and im giving 50 pts for answers.
Answer:
What exactly are we supposed to help you with?
Explanation:
I am concerned.
Propuso la teoría catastrofista, según la cual habían sucedido varios episodios de extinción, debidos a grandes cataclismos, seguidos siempre de nuevos periodos de creación
Answer:
Georges Cuvier.
Explanation:
Georges Cuvier (1769-1832) fue un zoólogo quien propuso que la evolución era el resultado de extinciones producidas por catástrofes a las cuales les sucedían nuevas creaciones con distintas especies. Los ecosistemas con las catástrofes eran destrozados y en los suelos de estos quedaban los restos de los animales extintos formando parte de los estratos de la tierra.
State the structure by which the embryo develops and grows.
Answer:
the structure by which the embryo is called the oblica cord
Which growth model is a realistic representation of population growth?
A realistic representation of population growth is the _____ growth model.
Answer:
Logistic Growth Model
Explanation:
The logistic model is realistic because it suggests the fact that the population of species is regulated and controlled by the carrying capacity (maximum members that an ecosystem supports) of the ecosystem. The population becomes small when the carrying capacity decreases.
the two main function of sweat are
a. to keep the body cool and to remove excess protein
b. to remove waste products and to cool the body
Answer:
b. to remove waste products and to cool the body
Explanation:
pretty sure
Please help
Please answer correctly
Answer:
1 a
2 b
3 c
Explanation:
Identify the object with greatest inertia.
Bowling ball
Tennis ball
Billiard ball
Basket ball
Answer:
Bowling ball
Explanation:
The cells in this part of a plant form long, vertical tubes. What is the most
likely relationship between the structure and function of these specialized
cells?
O A. The tubes allow water and nutrients to be transported throughout
the plant.
O B. The tubes prevent potential damage to the leaves caused
used by
strong winds.
C. The tubes allow the plant to absorb sunlight for photosynthesis.
O D. The tubes prevent water loss from the leaves.
Answer:
A. The tubes allow water and nutrients to be transported throughout
the plant.
Where does the egg receive its energy from?
options:
a. The ovum contains a large quantity of cytoplasm, which contains nutrients for the first days of development after fertilization. The cytoplasm of the ovum contains over 140 000 mitochondria to produce ATP required for growth.
b. The uterus contains over 140 000 mitochondria to produce ATP and supplies this to the egg for growth.
c. Similar to sperm it receives its energy from fructose through its path to the uterus.
d. The ovum contains a large quantity of fimbria, which contains nutrients for the first days of development after fertilization.
Answer:
Until attachment to the uterus, the developing organism is on its own. That means it needs to supply its own energy, so the cytoplasm of the human egg cell contains many energy-generating factories called mitochondria. Those mitochondria come only from the mother.
a. The ovum contains a large quantity of cytoplasm, which contains nutrients for the first days of development after fertilization. The cytoplasm of the ovum contains over 140 000 mitochondria to produce ATP required for growth.
Explanation:
Some broad-spectrum proteases (protein hydrolyzing enzymes) and nucleases (nucleic acid hydrolyzing enzymes) that function in eukaryotic cells have an optimum pH close to 5.0, whereas the cytosol of most cells is closer to pH 7.0. Which part of a eukaryotic cell might you predict to have a low pH suited to maximizing the activity of these enzymes
Answer:
lysosome
Explanation:
The lysosome is a membrane-bound organelle found in nearly all eukaryotic cells. The lysosome contains different types of enzymes (i.e., proteases, nucleases, glycosidases, lipases, phosphatases) which are required for the digestion of macromolecules and microorganisms, and recycle macromolecules in the cell. These enzymes are only active in acidic (lysosome) conditions, and they can be deactivated in case of lysosomal rupture because in the cytosol the pH is neutral to slightly alkaline (∼7.3–7.4).
Need help please …..
The inferior region of the brain stem, the __________ houses many vital autonomic centers involved in the control of heart rate, respiratory rhythm, and blood pressure.
Answer:
The inferior region of the brain stem, the medulla oblongota houses many vital autonomic centers involved in the control of heart rate, respiratory rhythm, and blood pressure.
Explanation:
The medulla oblongata is the part of the brain that joins the spinal cord and forms the lower part of the brain stem. In the bulb there are ascending (sensory) and descending (motor) fascicles that communicate the spinal cord with the brain, in addition to numerous nuclei or centers (masses of gray matter) that regulate various vital functions. The medulla oblongata has the function of controlling vital and unconscious elements such as the heartbeat and blood pressure. Thus, it is responsible for maintaining the heart rate and regulating vasoconstriction. Also, it manages the control of respiratory function, maintaining it at all times.
Look at the diagram. When this process happens in human cells, how many chromosomes will there
be in cell F?
Enter your answer as a number
Answer:
46 chromosomes
Explanation:
In mitosis (I think it is this process) the 46 chromosomes in cell A replicate themselves, so there are 92 in total in cell B. Then the chromosomes are pulled apart and the cell splits into 2 daughter cells, leaving 46 chromosomes in each.
Answer:
46
Explanation:
Myoglobin levels are higher in Tibetans and other ethnic groups that live at high altitudes. Explain the benefit of higher myoglobin levels for individuals living at high altitudes.
Answer:
They are able to take up and store more oxygen in their muscles
Explanation:
According to Oxford dictionary, myoglobin is ''a red protein containing haem, which carries and stores oxygen in muscle cells. It is structurally similar to a subunit of haemoglobin.''
The fact that Tibetans have a high level of myoglobin implies that they are able to take up and store more oxygen in their muscles since myoglobin is involved in storage of oxygen in muscle cells. Hence elevated levels of myoglobins enables the muscle cells to work more effectively.
what molecule is used to store and release chemical potential energy in living things
a) ATP
b) RNA
c) DNA
d) ADP
Answer:
a) ATP
Explanation:
ATP is main source of energy that powers most of the living cells in the known parts of our universe.
Answer:
a) ATP
Explanation:
adenosine triphosphate (ATP)
Inside the cell, each sugar molecule is broken down through a complex series of chemical reactions. As chemical energy is released from the bonds in the monosaccharide, it is harnessed to synthesize high-energy adenosine triphosphate (ATP) molecules. ATP is the primary energy currency of all cells.
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Why do many plants have specialized cells that produce colorful flowers?
O A. To collect more sunlight
B. To attract insects
C. To attract prey
O D. To scare away predators
Answer:
It's B, to attract insects. :)
Explanation:
Why do you think gene therapy is such a promising field for this disease?
Answer:
Gene therapy replaces a faulty gene or adds a new gene in an attempt to cure disease or improve your body's ability to fight disease. Gene therapy holds promise for treating a wide range of diseases, such as cancer, cystic fibrosis, heart disease, diabetes, hemophilia and AIDS.
