Answers
Answer:
The plasma membrane is semi-permeable. The reason for this is because of the orientation of the phospholipids. The heads at the surface are hydrophilic so they face the water. The tails are hydrophobic so they face away from the water.
Explanation:
The phospholipids of the plasma membrane are oriented such that their heads are at the membrane surfaces and their tails are buried in the interior of the membrane - due to the fact that phospholipids have hydrophobic tails and hydrophilic heads.
Phospholipids consist of fatty acids and alcohol in the plasma membrane are arranged in two layers, known as the phospholipid bilayer. It has a hydrophobic or water-hating tail and a hydrophilic or water-loving head.
it has a head and two tails.As the tails are hydrophobic so, face the inside, away from the water.As the heads are hydrophilic so face outwardHeads are towards intracellular and extracellular fluid.Tails are meet the inner layerThus, the correct answer is - due to two layers of hydrophobic tails and hydrophilic heads.
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Related Questions
What would you expect to happen to a plant as temperature and precipatiom increases? Write your claim and evidence!!
Answers
Answer:
Both have great effect on plant when increases from a certain limit.
Explanation:
When the temperature falls in the optimum range it has a good effect on plants growth because the rate of photosynthesis is maximum. Precipitation also has a great effect because it provides water that is necessary for the plants. If the temperature increases from a certain limit, it burns plant body and decreases photosynthesis whereas if precipitation increases it causes flood condition which kills the plant due to removal from the soil.
Which gland is known as the "master gland" because it sends chemical messages to many other glands?
thyroid gland
thymus gland
pineal gland
pituitary gland
Answers
Answer:
Pituitary gland is known as the master gland
Acellus
When the resources in an
environment are at optimum
levels, what can happen?
The population size can grow
B
The population size can decrease
Copyright © 2003 - 2021 Acellus Corporation. All Rights Reserved.
Answers
Answer:
The population size grow /can grow
Answer:
the population size can grow
Explanation:
The excited electron then loses its energy as it travels down the
Answers
The excited electron then loses its energy as it travels down the Then, at some point, these higher energy electrons give up their "extra" energy in the form of a photon of light and fall back down to their original energy level.
What happens to an electron when it loses energy?
The lines in an emission spectrum occur when the electron loses energy, and "falls back", from a higher energy state to a lower one emitting photons at different frequencies for different energy transitions.
How can an electron in an atom lose energy?For an isolated atom or molecule in a gas, excited states of electrons often don't have any easy way to lose energy except by electromagnetic radiation- the light of some frequency. A little of the energy can go into internal vibrations for a molecule.
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One way to get consistent, valid data is to
A. be sure that instruments are calibrated properly.
B. use simple instruments to make measurements.
C. select the best data to place into data tables.
D. make the measurements as quickly as possible.
Answers
URGENT PLZ ANSWER
Which of the following observations provide evidence of evolutionary relatedness among organisms? Select all that may apply.
a) Similarities in molecular structures (DNA)
b) Similarities in the way they behave
c) Similarities in body structure
d) Similarities in the foods that organisms eat
e) Similarities in embryological development
Answers
PCR is a technique used to copy a target DNA sequence. Researchers often use DNA polymerase from Thermus aquaticus, a bacteria species that lives around hydrothermal vents.
denaturation 94-96 degrees celsius.
elongation 72 degrees celsius
annealing 68 degrees celsius
Which of the following best explains why the polymerase from the species T. aquaticus is often used
for PCR?
A. T. aquaticus polymerase has an optimal temperature of 68°C.
B. T. aquaticus polymerase does not denature at high temperatures.
C. T. aquaticus polymerase can be used more than once without degrading.
D. T. aquaticus polymerase adds nucleotides to both the 3' and 5' ends of DNA.
Answers
Answer:b
Explanation:because I said so
The pH scale ranges from ____________ to ____________ and is used to indicate the ____________ of a solution.
Answers
Answer:
Acidic, Basic, acidity
Explanation:
The PH scale ranges from acidic to basic and is used to indicate the acidity/alkalinity of a solution.
A normal PH scale ranges from the number 0 to 14. When the PH of a solution ranges from 0 to 7 is said to contains acidic contents in it. If the solution is greater than 7, it is said to be alkaline and when the solution is average(7) it is said to be neutral solution.
Example of an acidic substance/solution is lemon juice, solution that contain alkaline is bleach.
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The stomach makes a substance that gives the correct pH for enzyme action. Name this substance.
Answers
Answer:
The stomach produces hydrochloric acid.It kills many harmful microorganisms that might have been swallowed along with the food.The enzymes work best in acidic conditions-at low pH
Hydrochloric acid is an important component of the gastric juice in animal species such as humans. This maintains the pH in the stomach.
What is Hydrochloric acid?Hydrochloric acid is also known as muriatic acid, it is an aqueous solution of the compound hydrogen chloride. Hydrochloric acid is a colorless solution with a distinctive pungent smell. It is mainly classified as a strong acid. However, it is a component of the gastric acid in the digestive systems of most of the animal species, including humans. Hydrochloric acid is an important component of the digestive system.
Hydrochloric acid (HCl) is a part of the gastric juice. It plays an important role in creating the pH required for pepsin activity and for the maintenance of this pH. Parietal cells in the stomach are responsible for the production of HCl acid by secreting hydrogen and chloride ions separately. When pepsinogen and hydrochloric acid exist together in the gastric juice, pepsin is converted into its active form.
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Passive solar houses have many large windows.
True
False
Answers
How many traffic accidents are attributed to drowsy driving
Answers
Answer:
Prevalence of Drowsy Driving Crashes
According to the National Highway Traffic Safety Administration, every year about 100,000 police-reported crashes involve drowsy driving. These crashes result in more than 1,550 fatalities and 71,000 injuries.
Explanation:
have a great day
Scientists can use mutants to study metabolic pathways. These organisms have a mutation in a gene encoding a metabolic pathway enzyme that results in the inactivation of that enzyme. Saccharomyces cerevisiae (a yeast species) mutants are available that grow on fructose, but not glucose. This growth defect results from a mutation in the gene encoding what enzyme?
a. phosphoglycerate kinase
b. enolase
c. pyruvate kinase
d. phostphoglycerate mutase
e. Phosphoglucose isomerase (phosphohexose isomerase or glucose-6-phosphate isomerase)
Answers
Answer:
The correct answer is - e. Phosphoglucose isomerase (phosphohexose isomerase or glucose-6-phosphate isomerase)
Explanation:
Phosphoglucose isomerase (phosphohexose isomerase or glucose-6-phosphate isomerase) is an enzyme that catalyzes the conversion of the glucose-6-phosphate to fructose-6-phosphate or fructose-6-phosphate to glucose-6-phosphate.
In the given question there most likely a mutation that takes place in Phosphoglucose isomerase as it is not able to convert glucose to fructose which is a growth defect.
g One benefit of operons in bacteria is that they a. do not need ligands and regulatory proteins as single genes would. b. do not need any modification of the proteins after they are expressed. c. allow for alterations in DNA sequence by flipping promoters around. d. allow for coordinated gene expression of related genes on one mRNA controlled by one promoter. e. allow the bacteria to use a wide variety of carbon sources.
Answers
Answer:
d. allow for coordinated gene expression of related genes on one mRNA controlled by one promoter.
Explanation:
An operon is a group of functionally-related genes that share the same promoter region and the same operator which interacts with specific repressors or activators, and they are transcribed as a unit. This transcriptional unit (operon) is present in prokaryotic organisms (i.e., bacteria and archaea) but absent in eukaryotes. In an operon, each structural gene is known as a cistron, and they are transcribed together as a polycistronic primary messenger RNA (mRNA).
Why do organisms develop symbiotic relationships with other species in their
environment? *
Answers
Answer:
Competition, Organisms of two species use the same limited resource and have a ... In interspecific competition, members of two different species use the same limited ... In mutualism, two species have a long-term interaction that is beneficial to both ... size of a species that the environment can sustain is its carrying capacity.
Explanation:
Answer:
Symbiotic relationships are important because they are a major driving force of evolution. This networking and cooperation among species allows them to survive better than they would as individuals
Explanation:
1,260 deer are living on an island that is 840 square kilometers in size. What
is the population density of the deer per square kilometer?
Answers
Answer:
1.5 deer/km^2
Explanation:
_________ is the enzyme responsible for breaking the hydrogen bonds between base pairs and separating the two strands of DNA.
Answers
Answer:
DNA helicases.
Do you think murder committed during sleep walking is a punishable offense? Why?
Answers
Answer:
no because ur sleep walking and u cant control that
Answer:
yes and no
Explanation:
because when your asleep you dont know what your doing and when you get woken uo you tend to get violent so yea
Explain some of the reasons why not everyone shows traditional lateralization
Answers
Answer:
The right side of the brain may have developed more than the left side.Both sides of the brain developed equally.Explanation:
Lateralization is the term used to designate the tendency that some functions of the organism are more developed on one side of the brain. Traditional lateralization, promotes that these functions are more developed on the left side of the brain, making the right side of our body more dominant. However, it may happen that these functions develop more on the right side of the brain, or develop on both sides and in an egalitarian form, causing some people to have lateralization different from the traditional.
Like all valid scientific theories, modern cell theory
Answers
builds on the work of earlier scientists
Answer:
builds on the work of earlier scientists
Explanation:
hope it helps
why do distantly related species in very different places sometimes share similar traits?
Answers
How do genes determine the traits of an organism? Explain in detail.
Answers
Answer:
Im confused on what you mean
Explanation:
A chromosome is a condensed (tightly packed) amount of DNA. A gene is a region of DNA that codes for a protein. These proteins determines your traits.
When a gene is active the protein is transcribed through the the central dogma (dna —> rna —> protein) that protein acts in a signaling pathway that will lead to a specific trait.
Which completely transformed scientific study?
the Scientific Revolution
the Enlightenment
the Renaissance
the Reformation
Answers
Answer:
Enlightenment
Explanation:
These all transformed scientific study in a huge way, so its hard to answer without context. But the Enlightenment had the largest growth in this area
the result of a laboratory experiment
Answers
Explanation:
A laboratory experiment is an experiment conducted under highly controlled conditions (not necessarily a laboratory), where accurate measurements are possible.
The researcher decides where the experiment will take place, at what time, with which participants, in what circumstances and using a standardized procedure.
What is the net charge of histidine at pH = pKa2?(pKa1 = 1.8, pKa2 = 6.0, pKa3 = 9.3
Answers
Answer:
The answer is explained in the steps
Explanation:
I
D
K
W
H
A
T
T
H
E
A
N
S
W
E
R
I
S
!
Where does the CO2 come from that is used in the Calvin Cycle?
Answers
Answer:
It comes from the atmosphere and more specifically, cellular respiration.
Explanation:
Answer:
Paul and Jennifer university are stadying
what's "1 syllables & 2 syllables and 3 syllables meaning"
Answers
Answer:
Monosyllabic
Explanation:
Answer:
Hope it helped
Explanation:
1 syllable means monosyllabic
2 syllables means disyllabic
3 syllables means trisyllabic
PLS RATE AS BRAINLIEST ANSWER
You have the following consumable items that you do not want spoiled by the action of microorganisms, but you have space in your refrigerator for only one. You have already opened each and consumed some. Which one of these is most likely to spoil fastest and should therefore be placed in the fridge?
A. Bread Flavored syrup (contains water, high sugar concentration, flavors, e.g., used to flavor coffee and drinks)
B. Apple juice 80 proof liquor (contains water, 40% ethanol, flavors)
C. Mineral water (contains water, minerals)
Answers
Answer:
Bread Flavored syrup (contains water, high sugar concentration, flavors, e.g., used to flavor coffee and drinks)
Explanation:
Food spoilage refers to a situation in which food is no longer fit for consumption due to the action of certain microorganisms on the food. Hence, microorganisms cause the spoilage of food and beverages.
The rate of action of microorganisms on different beverages depends mostly on the content of the beverages.
Yeasts are often responsible for the spoilage of beverages with high sugar content and these tend to spoil faster than other beverages.
A scientist is researching two different traits in an insect: body texture and color. Smooth body (B) is dominant to bumpy body (b), and gray (G) is dominant to white (g). A BbGg and a bbgg insect mate and produce the following 480 offspring: Phenotype Number of Offspring Smooth, gray 119 Bumpy, white 117 Smooth, white 123 Bumpy, gray 121 What type of inheritance is displayed from these offspring
Answers
Answer:
Independent assortment
Explanation:
The type of inheritance displayed by the offspring is a simple independent assortment inheritance according to Mendelian law.
The result of crossing BbGg and bbgg is as follows (see the attached image)
4 BbGg smooth and gray
4 Bbgg smooth and white
4 bbGg bumpy and gray
4 bbgg bumpy and white
The phenotype ratio from the cross is 1:1:1:1 as far as the independent assortment is concerned.
Now, looking at the population of each phenotype from the cross
Smooth, gray 119
Smooth, white 123
Bumpy, gray 121
Bumpy, white 117
119:123:121:117 is approximately equal to 1:1:1:1.
Hence, the cross agrees with Mendel's law of independent assortment of genes.
Why does this matter? A mid-ocean ridge, which is formed
by hot mantle material rising up then
cooling down, is found along the plate
boundary between the South American
Plate and African Plate.
PLEASE ANSWER!! PLEASEE
Answers
Answer:
Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth's tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
Explanation:
Answer:
A mid-ocean ridge is a place where sea floor spreading occurs. They also form new rocks and mountains.
Explanation:
Which of the following statements about the fossil record is correct?
A. The fossil record includes more organisms that were abundant, or lived for long periods on Earth, than it is with those that lived for short periods of time and then became extinct.
B. The fossil record is richer with organisms that are the same ones as currently common and living on Earth today.
C. A fossil of a rain forest snake would not be found in an area on Earth that is currently a desert.
D. The fossil record is richer with organisms that resemble organisms that are those alive today.
Answers
Answer:
I believe the answer would be A
Explanation:
You would have more fossils of animals that lived longer time ago than recent one bc they would be more older and more beneath the ground.And for animals to fossilize takes a long time so more older animals would be fossils
Answer:
The answer would be option A.
Explanation:
The process of fossilization is a time taking process which undergoes several stages from drying and freezing to mineralization and petrification. A fossil takes about 2.5 to 3.5 billion years to form. Both biotic and abiotic factors plays an important role in fossil formation therefore, animals that were abundant and buried frequently are more likely to fossilize than animals that lived for a short duration. Moreover, animals that are more abundant and lived for a longer period of time would be likely buried beneath the earth and would have more chances of reaching an ideal condition for fossil formation such as no decomposition which could only be achieved in an oxygen deficit environment as oxygen accelerates the process of decomposition.For more information:
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