Answer:
The cell membrane is the outer layer of the cell. The primary function of the cell membrane is to regulate what substances enter and leave the cell. The cell membrane is selectively permeable, or "semi-permeable", meaning that the membrane only allows certain substances to enter or leave the cel
Answer:
b
Explanation:
because the membrane of a cell is responsible for what enters n leave the cells.
it can't be "D" because osmosis is the process by which water molecules enter a permiable or semi permiable membrane of an object from an area of high concentration to an area of low concentration.
fermentation is the process by which chemical changes occur in an organic matter do the answer is definitely not A
metabolism is the chemical processes that occur in an organism to maintain its life so the answer is not c
5. The structures pictured in Fig. 1 are found on the undersurface of a leaf.
What is the name and function of these structures?
Please i really need help because i’m french and it’s hard
Answer:
I think the black ones are stomata or guard cells and they are attached on epidermis
Stomata is used for breathing and epidermis is the skin(outer layer) of plants
Explanation:
I hope this helps a little please give me brainliest
Answer:
epidermis
provides barrier against injury and water loss
guard cells
surrounds stomata also closes and opens stomata
stomata
allows gaseous exchange
Explanation:
the rate of a chemical reaction is dependent upon?
Explanation:
Reactions occur when two reactant molecules effectively collide, each having minimum energy and correct orientation. Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
1. Many early farmers of the Western U.S. plains believed a theory called
"Rain Follows the Plow." What was the problem with this theory?
5 points
a. Farming actually makes it rain less, not more.
b. The climate at the time farming took place was not any different than normal.
c. The usually high precipitation during this period of early farming and settling was a
coincidence
d. This theory is actually true. Farming and settling an area makes it rain more
frequently
Answer:
d
Explanation:
because when you plough your field for crops to grow rain falls for the crops to yeild well
What is the difference between the euphotic zone and the bathyal zone of the ocean
Answer:
Euphotic zone is the layer closer to the surface that receives enough light for photosynthesis to occur. Beneath lies the disphotic zone, which is illuminated but so poorly that rates of respiration exceed those of photosynthesis.
Bathyal zone is the part of the pelagic zone that extends from a depth of 1000 to 4000 metres below the ocean surface. It lies between the mesopelagic above, and the abyssopelagic below.It is ala known as midnight zone.
Explanation:
These organisms are so important for an ecosystem that their removal would cause the entire ecosystem to change.
Answer:
keystone species
Explanation:
HELP I really need an answer for this!! Does anyone know?
Enzyme X catalyzes the conversion of substrate A into product B. If you wanted to use enzyme X to catalyze a different reaction, the new substrate would have the best chance of working with enzyme X if it has the same
A. charge as substrate A
B atomic composition but different structure as substrate A.
C. molecular weight as substrate A.
Dthree-dimensional shape and charge distribution as A.
Answer:
A
Explanation:
List the inputs and
outputs of photosynthesis.
What part(s) of the plant
are responsible for taking
in each of the inputs?
Answer:
Photosynthesis Inputs. 6H2O, 6CO2, (light) energy.
Photosynthesis Outputs. C6H12O6 (glucose), 6O2.
Light Reactions Inputs. Light (energy), ADP, Pi, NADP, H2O.
Light Reactions Outputs. O2, ATP, NADPH.
Calvin Cycle Inputs. CO2, ATP, NADPH.
Calvin Cycle Outputs. G3P.
Explanation:
how you think reproduction differs among these four animals.
a. bird. b. human c. ants d. sea stars
Answer:
c
Explanation:
Which of the following happens as part of both the lytic cycle and the
lysogenic cycle?
new viruses are made
O the host cell dies
O the entire virus infects the cell
O the virus injects its nucleic acid into the host cell
Answer:
vnmvm
Explanation:
What organelle wouldn’t have a job if the smooth and rough ER didn’t work?
Answer: The Golgi apparatus.
Explanation: I believe it is the Golgi apparatus as the Rough ER and Smooth ER create proteins and sort them in to piles before sending to the Golgi apparatus to deliver.
The Smooth ER and Rough ER are like the suppliers while the Golgi apparatus is like the transporter.
Remember: Proteins have many functions and are needed severely to perform those actions that without the Golgi apparatus, those proteins wouldn’t be able to be transported.
please help, give explanation please!
Answer:
1. 0 chance (0%)
2. 2 chances (50%)
3. 4 chances (100%)
Explanation:
the way a punnet square works is that you basically multiply two genes. for example:
b b
B Bb Bb
b bb bb
then, if it's uppercase, it is dominant. if it's dominant, it will take over the recessive gene. if it was Bo, B being brown and dominant, and o being recessive and orange, then brown would take over. there are also cases with codominant but that's not in the question. feel free to ask me anything about this.
up to about three thousand million years ago there was no oxygen in Earth's atmosphere today about one-fifth of the atmosphere is oxygen gas. suggest what caused this change???
pls help
Answer:
Oxygen makes up about one-fifth the volume of Earth's atmosphere today, and is a central element of life as we know it.
But that wasn't always the case. Oxygen, although always present in compounds in Earth's interior, atmosphere, and oceans, did not begin to accumulate in the atmosphere as oxygen gas (O2) until well into the planet's history. What the atmosphere was like prior to oxygen's rise is a puzzle that Earth scientists have only begun to piece together.
Earth coalesced a little more than 4.5 billion years ago from bits of cosmic debris. Liquid oceans existed on the planet almost from the beginning, although in all likelihood they were repeatedly vaporized by the massive meteorites that regularly clobbered the planet during its first 700 million years of existence. Things had settled down by 3.8 billion years ago, when the first rocks that formed under water appear in the geologic record. (They exist in what is now southwest Greenland.)
If Earth had water, it must have had an atmosphere, and if it had an atmosphere, it must have had a climate. What was Earth's early atmosphere made of? Nitrogen (N2), certainly. Nitrogen makes up the bulk of today's atmosphere and likely has been around since the beginning. Water vapor (H2O), probably from volcanic emissions. Carbon dioxide (CO2), also emitted by volcanic eruptions, which were plentiful at that time. And methane (CH4), generated inside the Earth and possibly also by methane-producing microbes that thrived on and in the seafloor, as they do today.
Carbon dioxide, water vapor, and methane played an important role in Earth's subsequent development. Four billion years ago, the Sun was 30 percent dimmer, and therefore colder, than it is today. Under such conditions, Earth's water should have been frozen, yet clearly it wasn't. The water vapor, carbon dioxide, and methane acted as greenhouse gases, trapping heat and insulating the early Earth during a critical period in its development.
Of oxygen, meanwhile, the early atmosphere held barely a trace. What did exist likely formed when solar radiation split airborne molecules of water (H2O) into hydrogen (H2) and oxygen (O2). Hydrogen, a lightweight gas, would have risen above the atmosphere and slowly been lost to space. The heavier oxygen gas, left behind, would have quickly reacted with atmospheric gases such as methane or with minerals on Earth's surface and been drawn out of the atmosphere and back into the crust and mantle. Oxygen could only begin to accumulate in the atmosphere if it was being produced faster than it was being removed'—in other words, if something else was also producing it.
That something was life. Although the fossil evidence is sketchy, methane-producing microbes may have inhabited Earth as long ago as 3.8 billion years. By 2.7 billion years ago, a new kind of life had established itself: photosynthetic microbes called cyanobacteria, which were capable of using the Sun's energy to convert carbon dioxide and water into food with oxygen gas as a waste product. They lived in shallow seas, protected from full exposure to the Sun's harmful radiation. (To learn more about these organisms and the fossil evidence for them, watch the accompanying video "Early Fossil Life.")
Help me please I don’t understand I rlly need the answer
Answer:
True
Explanation:
I read it at biology class
Sickle cell anemia is a genetic disorder in which the hemoglobin responsible for transporting oxygen is misformed. The disease begins with a mutation in a _______________ acid, which results in a structural difference in a–
Protein; nucleic acid.
Nucleic acid; lipid.
Nucleic acid; protein.
Protein; lipid.
Answer: protein , nuclei acid
Explanation:
A vacuole is the cell's _______________.
A: control center
B: storage place
C: energy processor
Answer: B- storage place
Explanation:
4) What is the most important chemical made during the light-independent reactions? It stores the energy that came from the sun.
The Calvin Cycle
Once in the mesophyll cells, CO2 diffuses into the stroma of the chloroplast, the site of light-independent reactions of photosynthesis.
Mike works as a nurse in a hospital he accidentally gave a patient a hypotonic solution. such as distilled water instead of an isotonic solution suck as saline
what changes will occur in the patients cells ?
what can be done to fix this problem ?
Answer:
The patient's cells will swell and then burst. The solute concentration outside the cell is lower than inside the cell, so water will move into the cells.
Mike would have to give the patient a hypertonic solution, which will cause water to move out of the cell and the cell to shrink followed by an isotonic solution, which should regulate the concentration inside and outside the cell.
Hope that helps.
7) Select 2 that apply.
Which nucleotides can pair together? Select all that apply.
please help
Answer:
Adenine(a) and Thymine(t), Cytosine(c) and Guanine(g)
Explanation:
Judy took some dead grass and soaked it in water for a few days. Then she looked at it under a microscope. She saw some tiny things moving around under the microscope. How could Judy tell whether what she was looking at were living things? Check all of the following that could be used to decide whether the things Judy saw were living. (
Answer:
Living Cells created from the dead grass
Explanation:
Because the water has nutrients.
how would you describe the motion of a transverse wave
Answer:
Transverse wave, motion in which all points on a wave oscillate along paths at right angles to the direction of the wave's advance. ... Surface ripples on water, seismic S (secondary) waves, and electromagnetic (e.g., radio and light) waves are examples of transverse waves.
Explanation:
hope it helps you.
ttaccgg taacgca cgcatgt tgaccta gccaatt
Answer: Uh okay then
Explanation:
Answer:
tacgagcatgcatgca
tgca gcta tagac tacg
ill give brainliest to anyone who helps me with this
Describe the processes of transcription and translation in your own words
Terms to use in your answer: amino acid, anticodon, codon, gene, messenger RNA, nucleotide, ribosome, RNA, RNA polymerase, transcription, transfer RNA, translation.
Answer:
Explanation:
The genes in DNA encode protein molecules, which are the "workhorses" of the cell, carrying out all the functions necessary for life. For example, enzymes, including those that metabolize nutrients and synthesize new cellular constituents, as well as DNA polymerases and other enzymes that make copies of DNA during cell division, are all proteins.
In the simplest sense, expressing a gene means manufacturing its corresponding protein, and this multilayered process has two major steps. In the first step, the information in DNA is transferred to a messenger RNA (mRNA) molecule by way of a process called transcription. During transcription, the DNA of a gene serves as a template for complementary base-pairing, and an enzyme called RNA polymerase II catalyzes the formation of a pre-mRNA molecule, which is then processed to form mature mRNA (Figure 1). The resulting mRNA is a single-stranded copy of the gene, which next must be translated into a protein molecule.
He is ....
A. Element
B. Composite
C. Homogeneous mixtures
D. Heterogeneous mixtures
helium is an element..............
Answer:
A. Element
Explanation:
He is a symbol of an element called helium. Helium is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas (gas whose atoms are not bound to each other). It's the first in the noble gas group in the periodic table. As we can see in the attached image, its atomic number is 2.
Helium is known for causing people to have a high-pitched voice after being inhaled. Because it is lighter than air, when you inhale it and try to talk, the sound waves travel faster through the lower-density gas, resulting in a high-pitched voice.
What does evaporation change from ? Solid ———> liquid Liquid ———-> Solid What does condensation change from Liquid——-> solid Solid———> liquid
Answer:
Evaporation : Liquid --- Gas (Vapor) ; Condensation : Gas (Vapor) --- Liquid
Explanation:
Evaporation is the change of a liquid into gas or vapor, usually by increase in temperature. Eg : Water evaporation into vapors during water cycle, due to sun heat.
Condensation is the change of gas or vapor into liquid, usually by decrease in temperature. Eg : Vapors condensation into water droplets during water cycle, due to lower atmospheric temperature at higher height.
PLEASE HELP I WILL GIVE YOU MULTIPLE BRAINLYS ON DIFFRENT POSTS!!!!!!!
Explanation:
hy i can help you but what we have to do in that pdf
edicted answer - oh! i got that
If one was able to view the individual particles in each of these substances, which particles would appear to be moving the FASTEST?
A) the water molecules in a sheet of ice
B) the neon plasma in a fluorescent 'Open' sign
C) the atoms in the liquid mercury of a thermometer
D) the carbon dioxide molecules in the fizz of a cola drink
Answer:
D and A are devently slow My guess would be B or C, since a neon sign usually turn on instantly (or technical within mil a seconds) Its probably the fastest
my guess is C
What 2 things must pass out of the nuclear pores?
Answer:
The two things that must pass through nuclear pores are small polar molecules, ions, and macromolecules (proteins and RNAs)
Explanation:
Answer:
small molecuels and ions
Explanation:
The agricultural research facility during a research accidentally changed the DNA sequence of a wheat plant from GCCATGTT to GCGTACTT and this mutation resulted in a stronger plant variety. What kind of mutation did the plant undergo? A. inversion B. substitution C. insertion
Answer:
Substitution!
Explanation:
The researcher substituted GCCATGTT for GCGTACTT. The underlined section is what was changed. Hope this helps!
Name this stage of the cell cycle
A) prophase
B) Metaphase
C)interphase
D)telophase
Answer:
mitosis
Explanation:
Which of the following limiting factors would have the least affect on poulation size?
A.
drought
B.
succession
C.
wildfire
D.
decomposition
Answer: D
Explanation: