Answer:
Explanation:
the attractive forces between similar molecules is referred as cohesive forces water molecule attract each other through cohesive forces and has strong cohesion because of strong hydrogen bonding
The blood-brain barrier (BBB) is most permeable to which of the following?
A. Platelets, white blood cells and red blood cells.
B. Sodium, potassium and chloride.
C. Glucose and oxygen.
D. Antibiotics.
Answer:
C. Glucose and oxygen.
Explanation:
The blood-brain barrier is a composition of endothelial cells that regulate the entry of substances into the extracellular fluid found in the central nervous system. Their high degree of selective permeability ensures that no solutes can cross the barrier, and only the right substances which are crucial to the workings of the central nervous system can scale through.
Oxygen which is needed for the proper functioning of the central nervous system and which is hydrophobic in nature is allowed to pass the blood-brain barrier. Glucose too which is an important nutrient/macromolecule for brain health can also move through the blood-brain barrier.
A scientist wants to test whether the pH, salinity, or temperature of seawater impacts coral
development. He sets up an experiment with three conditions:
Aquarium 1: Normal pH, normal salinity, normal temperature
Aquarium 2: High pH, high salinity, high temperature
Aquarium 3: Low pH, low salinity, low temperature
What factor would improve experimental design the most?
Eliminating Aquarium 1 since it only uses normal conditions
Testing one variable at a time and keeping the other two variables constant
Using one aquarium and changing the variables from day to day
Setting up the variables on a gradient in each aquarium
Answer: Testing one variable at a time and keeping the other two variables constant
Question 6
How many
extrinsic eye muscles control each eye in a cow?
O 12
6
O 5
4
Answer:
12 jdjdjmrmrkkdmmuscles
Answer:
4
Explanation:
Cows have only four muscles that control their eyes. They can look up, down, left, and right, but they can't roll their eyes like you can.
What happens to a watershed if it rains
Answer:eh water could either be drained into the soil or land on plants to become dew
Explanation:i searched up what a watershed was lol
How many extrinsic eye muscles control each eye in a cow?
O 12
06
O 5
O4
Answer:
Cows have 4 extrinsic eye muscles that control each eye in a cow. They can look up, down, left, and right, but they can't roll their eyes as you can.
Which of the following is the Earth's largest reservoir of carbon dioxide?
atmosphere
icebergs
oceans
O soil
Why is a steam burn more severe than a hot water burn?
Answer:
Steam burns are more severe because of the latent heat of vaporization.
A cell membrane is very specific about what it allows across. How does t help the cell?
Answer:
Explanation:
The cell membrane (also known as the plasma membrane (PM) or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment.[1][2] The cell membrane consists of a lipid bilayer, including cholesterols (a lipid component) that sit between phospholipids to maintain their fluidity at various temperatures. The membrane also contains membrane proteins, including integral proteins that go across the membrane serving as membrane transporters, and peripheral proteins that loosely attach to the outer (peripheral) side of the cell membrane, acting as enzymes shaping the cell.[3] The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.[4] In addition, cell membranes are involved in a variety of cellular processes such as cell adhesion, ion conductivity and cell signalling and serve as the attachment surface for several extracellular structures, including the cell wall, the carbohydrate layer called the glycocalyx, and the intracellular network of protein fibers called the cytoskeleton. In the field of synthetic biology, cell membranes can be artificially reassembled
In figure 1, which symbol (unshaded square or shaded circle) represents the number of wildebeest, and which represents the percentage of wildebeest with rinderpest? How do you know?
Diagram a motion graph of a bicycle that travels 80 meters in 16 seconds. What is the speed in meters/second?
Answer:
50
Explanation:
d4 Science)
7. Where do you find membrane-bound organelles?
How many bacteria will there be after four hours from a single bacterium that divides to produce two cells every 15 minutes
Answer:
65,536 cells
Explanation:
According to the question, a single bacterium will divide into new cells every 15minutes. Since there are four 15 minutes in one hour, which is 60 minutes, a single bacterium will have divided (4×60/15) times =
= 240/15
= 16 times.
Since a single bacterium will divide 16 times in four hours cells, then in four hours, a single bacterium will have divided into 2^16 = 65536 new cells.
Note that, the number of cells a bacterium cell that will divide in two can be expressed as 2^n where n is the number of times
If a bacterium divides into 2 every 15 minutes, there would be 65536 bacteria after four hours.
The bacterium divides into 2 every 15 minutes. Thus, the cell will divide:
60/15 x 4 = 16 times in 4 hours
Thus:
First division = 2 cellsSecond division = 4 cellsThird division = 8 cellsFourth = 16 cellsFifth = 32 cellsSixth = 64Seventh = 128Eighth = 256Ninth = 512Tenth = 1024Eleventh = 2048Twelfth = 4096Thirteenth = 8192Fourteenth = 16384Fifteenth = 32768Sixteenth = 65536More on bacterial division can be found here: https://brainly.com/question/621474
what would happen if organisms did not have enzymes?
can anyone help me with the answer above? brainlist if you end up being correct
Answer:
Oligopoly
Explanation:
That's the answer
Answer:
Oligopoly
Explanation:
Explain how passive and active transport are similar and how they are different.
Answer:
Active transport moves molecules and ions from lower concentration to higher concentration with the help of energy in the form of ATP. On the other hand, passive transport moves molecules and ions from a higher concentration to lower concentration without any energy.
Explanation:
Answer:Active transport moves molecules and ions from lower concentration to higher concentration with the help of energy in the form of ATP. On the other hand, passive transport moves molecules and ions from a higher concentration to lower concentration without any energy.
Explanation:
What challenges cell biologists face in the 21st century?
Answer:
There are many types of challenges are faced by the scientists in 21st century. some are as given below:
Explanation:
1. Getting biodiversity. We're losing species at a disturbing rate, and we have to comprehend what the implications of that may be.
2. sustainable development. Like feasible agriculture, yet more broad sense. Discovering approaches to accommodate human needs while limiting the mischief we cause to the earth is urgent.
3. Everything about hereditary qualities. It's simply so much fun.
4. The most effective method to cut across political, social, and social limits and spur enormous and little scope activity to lessen biodiversity loss. This point may have a hefty sociology component, yet it's significant. All the natural and biological information on the planet won't make any difference on the off chance that we can't get individuals to follow up on it.
What do bones contain?
Answer:
Made mostly of collagen, bone is living, growing tissue. Collagen is a protein that provides a soft framework, and calcium phosphate is a mineral that adds strength and hardens the framework. This combination of collagen and calcium makes bone strong and flexible enough to withstand stress.
Explanation:
hope that helps
Answer:
Bones contain a soft tissue called marrow.
Explanation:
edge 2021
organs in different animal locomotion
Answer:
cilia, legs, wings, arms, fins, or tails are sometimes referred to as locomotory organs or locomotory structures.
hope this helped you
please mark as the brainliest (ㆁωㆁ)
Which statement describes the focus of an earthquake?
Answer:
B. It develops in the lithosphere.
Explanation:
the other person was right :)
Answer:
B
Explanation:
If you formed a protein that was 100 amino acids in length, how many water molecules would
be removed?
50 water molecules would be removed
Answer:
50 molecules
Explanation:
Divide the number by 2.
100 ÷ 2 = 50.
50 molecules must be removed.
Which statement is false about B-lactam antibiotics?
a) They are inactivated by bacterial B-lactamases
b) They can maintain their activity by co-administering B-lactamase inhibitors
c) They are reversible inhibitors
d) They inhibit a bacterial transpeptidase reaction
Answer: c) They are reversible inhibitors
Explanation: B-lactam antibiotics are not are reversible inhibitors. reversible inhibitors are inhibitors which the allow enzymes they inhibit to start working again, as there is no perman effects on the enzymes ( there is no change to the shape of it active site.). They can sometimes appear as competitive, non-competitive or uncompetitive.
what do you think the difference between simple and complex carbohydrates is?
Answer:
Complex carbohydrates are present in foods such as bread and pasta. Simple carbohydrates are in foods such as table sugar and syrups. Complex carbohydrates contain longer chains of sugar molecules than simple carbohydrates. The body converts these sugar molecules into glucose, which it uses for energy.
Explanation:
Hope that helps!
Certain kinds of shells are always found in rock layers lower than layers with plant fossils. Dinosaur fossils show up only in layers above or with plant fossils what does this tell you about When these organisms lived
Answer:
This shows that once animals were on the surface there were plants for them to eat.
Dinosaur fossils show up only in layers above or with plant fossils. This shows that dinosaurs were animals that lived with plants and feed on plants.
What are fossils?Fossils are the remains of plants, animals, and other substances that are preserved under the layers of rocks and earth. They are the preserved form that gives the knowledge of organism present in before times.
Dinosaurs lived 65 million years ago, but still, their bones and remains are found on earth. They were found with the fossils of plants, so this tells us that plants were also present at the time of their presence, and they fed on plants.
Thus, only strata above or in conjunction with plant fossils do dinosaur fossils appear. This demonstrates that dinosaurs were also plant-eating and lived with plants.
To learn more about fossils, refer to the link:
https://brainly.com/question/2194021
#SPJ2
I need help with and i will give you a branlist and it’s science
Answer:
B
Explanation:
Nitrogen has 7 protons
Who is known as the "father of modern chemistry" because he first organized all known elements into four different groups?
A. Johann Wolfgang Döbereiner
B. Antoine Lavoisier
C. Dmitri Mendeleev
D. Henry Moseley
Answer:
The answer is D, Henry Moseley.
Explanation: I took the quiz and scored 100%, so I'm certain this is accurate.
Answer:
Henry Moseley
Explanation:
About how big is an atom?
Select one:
a. one tenth of a meter
b. one ten millionith of a millimeter
c. one hundreth of a meter
I Am Pretty Sure The Answer Is "B"
Hope This Help's
Answer:
b
Explanation:
Match the following examples to the correct type of bone marking. a shallow depression in the back of the knee joint openings in the cervical vertebrae through which the vertebral artery travels a depression on the skull that houses the frontal lobes of the brain a bony projection on the tibia, below the knee a hole created by bones of the pelvis
Answer:
1. Fossa....a shallow depression in the back of the knee joint
2.Foramen.....openings in the cervical vertebrae through which the vertebral artery travels
3. Fossa....a depression on the skull that houses the frontal lobes of the brain
4. Tubercle...a bony projection on the tibia, below the knee
5. Foramen....a hole created by bones of the pelvis
This is a molecule of glucose, a simple carbohydrate. If this molecule were broken down, would it provide all of the elements needed to assemble lipids, nucleic acids, or proteins? Use evidence from the diagram in your answer.
Answer:
The correct answer is - no.
Explanation:
Carbohydrates are made up of thee elements carbon, hydrogen, and oxygen so if the carbohydrate is completely broken down it will release these elements.
Lipids are made up of similar elements as glucose however, they also contain sulfur and phosphorus. Similarly for proteins and nucleic acid nitrogen, nitrogen sulfur, and selenium other than the elements released by glucose.
Thus, the correct answer would be - no.
What advantages do diatoms obtain from sexual reproduction?a. increased genetic variability.b. increased ability of populations to respond to environmental change.c. evolutionary potential.d. regeneration of maximal cell size for the species.d. all of the above.
Answer:
The correct answer is: option D. all of the above.
Explanation:
In sexual reproduction, two opposite gender gametes are fused together to form a zygote by the process called fertilization which forms the new organism that is genetically unique.
In diatoms, sexual reproduction caused various types of advantages such as higher or enhanced genetic variability as recombination occurs. It also helps the ability to responding to environmental change Increasing the population or species size and other.
Thus, the correct answer is: option D. all of the above.
The process by which molecules such as glucose are moved into cells along their concentration gradient with the help of membrane-bound carrier proteins is called The process by which molecules such as glucose are moved into cells along their concentration gradient with the help of membrane-bound carrier proteins is called
Answer:
Facilitated diffusion
Explanation
Generally when molecules undergo passive diffusion along their concentration gradient,and aided by the cell membrane which provide hydrophillic areas for the molecules to pass through,this is called facilitate the diffusion.The membrane would be impermeable to these molecules without the proteins,
It is a special transport mechanism for large molecular substances like glucose and Amino acids and ions e.g Na+ and K+.Therefore facilitated mean to aid,thus the membrane proteins aids or help molecules to pass through.
Channel protein and carrier proteins are the two type of protein involved in the transport.They are specific for each molecules,and would only allow the passage of one molecule or ion through.
Energy is not needed for this to occur place the molecules of glucose are moving along the concentration gradient.
Specifically channel proteins are fixed in shape,some are gated.They are water filled pores Carrier proteins are flexible and adjust their shape to the two media for transport.Thus if the concentration of substances to be transported i s higher on on side A of the cell membrane proteins,the carrier protein will be open to that side to convey the molecules across.
The amount of molecules transported depend on the amount of the carries and channel protein available.