Answer:
A. Hole-punching the leaves- The purpose of hole punching the leaves is to make discs out of the leaves which are able to fit in into the syringe used in the experiment and which are also able to float
B. Adding bicarbonate buffer- Bicarbonate buffer is added as a source of carbon to leaves undergoing photosynthesis.
C. Exposing the disc to vacuum in the syringe - the leaves are exposed to vacuum in the syringe in order to remove or displace trapped air in the leaves so that the bicarbonate buffer can enter the interior of the leaves and the disc will then sink to the bottom of the syringe.
D. Adding a plain buffer- the plain buffer serves as the control experiment as it does not provide a carbon source for the discs in the experiment.
Explanation:
The floating disc experiment is used to demonstrate the process of photosynthesis in leaves. In the experment, the following procedures are followed:
A. Hole-punching the leaves- The purpose of hole punching the leaves is to make discs out of the leaves which are able to fit in into the syringe used in the experiment and which are also able to float
B. Adding bicarbonate buffer- Bicarbonate buffer is added as a source of carbon to leaves undergoing photosynthesis.
C. Exposing the disc to vacuum in the syringe - the leaves are exposed to vacuum in the syringe in order to remove or displace trapped air in the leaves so that the bicarbonate buffer can enter the interior of the leaves and the disc will then sink to the bottom of the syringe.
D. Adding a plain buffer- the plain buffer serves as the control experiment as it does not provide a carbon source for the discs in the experiment.
In the results of the experiment, the discs in the bicarbonate buffer will float as oxygen is produced during photosynthesis. However, the discs in the control remain at the bottom of the syringe as photosynthesis do not occur in the absence of a carbon source.
Being able to understand the relationship between DNA, mRNA, tRNA, ribosomes and proteins, is necessary for any researcher interested in gene therapy. Gene therapy is dedicated to correcting genetic defects by replacing mutated genes with wildtype versions. This can include complete removal and replacement of the entire gene (knock-outs or knock-ins) or removal of only the actual mutated nucleotides. Sickle Cell Disease is an example of a single-point mutation: GAG becomes GTG, which codes for a new amino acid. One would only need to replace a single base to correct the disorder making it very amenable to gene therapy. The mutant sickle cell allele is called HbS (for sickled hemoglobin) while the wt allele is HbA. Philippe Kasongo, a masters student from Oxford is studying for an oral exam on gene therapy, and has an especial interest in the disorder since he comes from the Democratic Republic of Congo where Sickle Cell has a historical high rate of occurrence due to the prevalence of malaria. Oral exams are a feature of certain British schools where students form a line and have to answer a series of questions from their proctor rather than take a written exam. Should we try oral exams at Lehman this semester
Answer:
Yes.
Explanation:
Yes, we should try oral exams at Lehman this semester in order to fulfill the research on gene therapy done by the masters student. Test is to evaluate the performance of the student in the class, it can be taken by both the methods i.e. through written or through oral exams. Both have the same significance because both evaluate the performance of the students so we can try oral exams instead of written exams at Lehman this semester to help the masters student in his research.
What are ways animals adapted to our current urban environment
Answer:
Did you know that animals camouflage themselves so they can adapt to their environment? Adaptation can protect animals from predators or from harsh weather. Many birds can hide in the tall grass and weeds and insects can change their colour to blend into the surroundings.
Explanation:
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HELP MEEEEEEEE
Answer:
amino acids determine the shape of a protein
i know why the call you Aphroditeee
Explanation:
Acid mine drainage occurs when surface water infiltrates __________.
A)
strip-mined coal beds and reacts with the mined coal
B)
spoil banks and reacts with minerals to create sulfuric acid
C)
land near coal mines and reacts with other water to form phosphoric acid
D)
groundwater and surface water supplies and reacts with the acids in these sources
E)
none of the above
Answer:
E) none of the above
Explanation:
Mining can be defined as the process of extracting mineral resources from the Earth's surface such as seem, placer, ore-body, vein etc. Some examples of minerals that can be mined are gravel, gold, chalk, petroleum, limestone, coal, potash, rock salt etc.
The various techniques used for mining includes the following;
1. Sluicing.
2. Placer mining.
3. Hard rock mining.
4. Hydraulic mining.
Acid mine drainage can be defined as the quantity of acidic water that is being drained or flows out from a mining site.
Generally, acid mine drainage occurs when surface water infiltrates spoil banks where chemical reactions (oxidation) occur with pyrite such as iron sulphide.
Answer:
I’m pretty sure it’s B
Explanation:
I’m taking the topic test right now I’ll get back with this
within which structure in the human body does specialization of parts of the developing a baby take place? PLEASE HELP
Answer:
the uterus?
Explanation:
Which is NOT a part of the nervous system?
Question 2 options:
Heart
Brain
Eyes
Dendrites
Answer:
Heart
Explanation:
Verified correct with test results.
1. What is the complementary sequence on a DNA strand to this = AAA TCG GTC TCC
2. Provide the complimentary strand for the following DNA code: TTA-CGC-ACT-GGC
Answer:
TTT AGC CAG AGG
AAT GCG TGA CCG
Please help luvs :)
9. Which of the following conditions is involved in producing earth
A. Plate movement forms faults
B. Faults store energy.
C. Plates release energy as they slide against each other.
D. All of the above.
A female guinea pig that was pure-breeding for white fur, mated with a male guinea pig
that was pure-breeding for brown fur.
All the offspring had brown fur.
One of the male offspring mated with a female with white fur.
What proportion of white offspring would be expected from this cross?
one half
none
one third
O one quarter
Answer:
one half
Because they both were pure breed (bb and BB) and all the offspring came out as brown that means that brown is the dominant trait. So the offspring are all Bb and if the offspring mated with a white fur she would have to be bb meaning their children woild be either Bb or bb
How would cloudy water affect photosynthetic organisms ?
Select one :
A. It would increase the rate of photosynthesis
B. It would have no effect on the rate of photosynthesis
C. It would decrease the rate of photosynthesis
Answer:
C
Explanation:
Since clouds block sunlight, they do affect the process in both plants growing on the land and aquatic plants. Photosynthesis is also limited when daylight hours are fewer in winter.Photosynthesis of aquatic plants can also be limited by substances in the water.
attach muscle to bone
Answer:
Tendons
Explanation:
Tendons are what enable muscles to connect to bones (Hope this is what you were looking for!)
if you were to design an organism, what 3 organ systems would be the most important to include?
Describe an adaptation to a plant's physical characteristic and explain how this adaptation helps the plant survive.
The development of stomata that are closed in arid conditions is an adaptation in plants. It allows plants to survive.
What is evolution?Evolution can be defined as descendence with modification, a process that involves natural selection.
Natural selection refers to the differential survival and reproduction of the more adapted organisms in a population.
Adaptations are specific features that allow organisms to have higher fitness in a population.
Stomata are structures for the interchange of gases (CO2 and O2) from the environment and can be closed to avoid water loss.
Learn more about adaptation here:
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Which part of the female reproductive system is highlighted below?
A. Ovary
B. Uterus
C. Cervix
D. Fallopian tube
Answer:
fallopian tube
Explanation:
The shown image is the uterus that is in option B, as the female uterus is a reproductive organ that is located in the lower part of the pelvic region and is also known as the womb. It is a pear-shaped muscular organ that is responsible for carrying a developing fetus during pregnancy.
What is a uterus?The uterus is made up of three layers of tissue: the endometrium, the myometrium, and the perimetrium. The endometrium is the innermost layer of the uterus, and it is the layer that thickens and sheds during the menstrual cycle. If a fertilized egg implants in the endometrium, pregnancy begins. The myometrium is the middle layer of the uterus and is made up of smooth muscle tissue. It is responsible for the contractions that occur during childbirth. The perimetrium is the outermost layer of the uterus and is made up of thin tissue that covers the uterus.
Hence, the shown image is the uterus that is in option B, as the female uterus is a reproductive organ that is located in the lower part of the pelvic region.
Learn more about the uterus here.
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The mutation rate in bacteria is about 3 nucleotide changes per 10 billion nucleotides per cell generation. Under laboratory conditions, bacteria such as Escherichia coli can divide and double in number about every 40 minutes. If a single Escherichia coli cell is allowed to exponentially divide for 24 hours in this manner, how many mutations would you expect to observe on average in the genome (5 million nucleotides) of each of the resulting bacteria compared to the original cell
Answer:
About 0.05 mutations
Explanation:
Given that:
The no. of mutations per generation = 3 nucleotide changes per 10 billion or 3 per 10000 million.
For 5 million nucleotides; we have = (3/10000) × 5 = 0.0015
For 24 hours i.e 36 generations; we have:
= 0.0015 × 36
= 0.054 mutations
Which of the following kinds of cells perform basic functions such as making molecules for growth? (SC.6.L.14.3)
Plant cells, but not animal cells
o Animal cells, but not plant cells
O Both plant cells and animal cells
Neither animal cells nor plant cells
Answer:
CE077004
Explanation:
Both plant and bacteria cells perform basic life functions such as making molecules for growth.
The cells require certain molecules for its growth and other vital activities. Both plant and animal cells perform basic functions such as making molecules for growth, i.e., option C.
What are the basic differences between plant and animal cells?Plant and animal cells are eukaryotic cells that means they have well developed nucleus.
There are many factors that differentiate plant cells from animal cells.
Cell wall, it is present in plant cells and absent in animal cells.Vacuole, it is large, prominent and central in plant cells while in animal cells it is absent or temporary.Lysosomes, it is present in animal cells but not in plants.Centriole, it is found in animals and not in plants.Another basic similarity other than being eukaryotic is that both plants and animal cells perform basic functions such as making molecules for growth.
Thus, the correct option is C.
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A person's pulse rate generally goes down while sleeping. One reason for this decrease is
Answer:
because the sympathetic nervous system is no longer active following strenuous exercise.
Explanation:
The photo shows a male peacock displaying his beautiful
feathers.
How does this behavior affect the peacock's chances of successfully
reproducing?
O A. It signals to other male birds that this bird wants to cooperate.
B. It is an example of camouflage and protection from predators.
C. It is a way of protecting young birds from harm.
D. It increases the bird's chances of finding a mate.
Answer: D. It increases the bird's chances of finding a mate.
Explanation:
As the question states, it's beautiful for the mate to see.
Answer:
d
Explanation:
How do weeds In plants affect the rate of transpiration?
Which statement is true about the Earth’s oceans? a. They are all getting larger due to the movement of tectonic plates. b. They have changed over time. c. They have not changed in 4 billion years. d. They are all getting smaller due to the movement of tectonic plates. Please select the best answer from the choices provided A B C D
Answer: B :)
Explanation:
Question 1:
Gases are brought into and out of a plant through its___
options:
1. root’s
3. leaves
_________________________________________
Question 2:
Animals that contain many cells are called____
options:
1. bacteria
2. Multicellular
3. Unicellular
(hi if u want brainlist's answer this question then ask another random question on your page so u can give me brainlist back, also i need to people to answer so i can chose one of you guys to give the brainlist's to, deal or no?)
Answer:
Answer 1= Leafs
Answer 2= Multicellular
#1- The leafs on a plant take in co2 and relese oxygen
#2 Multicellular means that there Multiple cells
Please mark me brainliest if it helps!
27. Which of the following plants belongs to fruit-bearing trees.
A. eggplant
B. soursop
C.string beans
D. tomato
Answer:
B
Explanation:
A soursop belongs to the fruit-bearing trees
describe the part of meiosis that are similiar to mitosis
Magnetic force is either ___________ or _______
Answer:
Attraction or Repulsion.
Name one method for separation of substances
Answer:
Chromatography
Explanation:
"involves solvent separation on a solid medium"
Answer:
Handpicking, winnowing, sieving, sedimentation, decantation and filtration are some of the methods of separating substances from their mixtures. Husk and stones could be separated from grains by handpicking. Husk is separated from heavier seeds of grain by winnowing.
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Which do you think is more important? - nature (genes) or nurture (environment)
Answer:
Nature.
Explanation:
Nature is more important than nurture because genes determine who we are. But our environment influences us, genes determine how it affects us. For this reason, nature is more important than nurture
A.
B.
C.
D.
Astronomy
Answer:
127min
Hope that helped
The reproductive structure of a fungus (i.e. mushroom) is composed of string-like
filaments called the mycelium.
True
False
True or false? The lac operon operates by having the repressor only leave the operator when it is bound to the lactose molecule
Answer:
true
Explanation:
When lactose is not available, the lac repressor binds tightly to the operator, preventing transcription by RNA polymerase. However, when lactose is present, the lac repressor loses its ability to bind DNA. It floats off the operator, clearing the way for RNA polymerase to transcribe the operon