Harvey placed the sea urchin cells in a hypersonic solution in order to see the behaviour of the cell in the hypersonic solution.
What Harvey placed the sea urchin cells in a hypersonic solution?In 1940 Ethel Brown Harvey evolve a technique for separating embryonic sea urchin cells. She took a pair of embryonic cells to develop from the first cell division after Harvey's fertilization. She settles the pair of cells in a hypertonic solution, carrying double the amount of salt as that contained in seawater. Most sea urchins produce a group of early embryonic cells which is known as micromeres. Small blastomeres Harvey that form by unequal cell division at the vegetal pole of the early embryo. Harvey Sub-Sea is the first that indicated Maritime Labor Convention compliant.
So we can conclude that Ethel Brown Harvey developed a technique for dividing embryonic sea urchin cells.
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what is active transport?
Answer:
the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
If you are pushing on a box with
5N, and the box pushes back 5N,
what would the net force be?.
ΑΟ
A. ON
B. 25N
C. 10N
The correct answer is A. 0N, as there is no net force acting on the box.
The net force in this scenario can be determined by calculating the difference between the applied force and the opposing force. In this case, if you are pushing on a box with a force of 5N, and the box pushes back with an equal force of 5N, the net force would be zero.
Net force is the vector sum of all the forces acting on an object. In this situation, the applied force of 5N is countered by the opposing force of 5N exerted by the box. Since the forces are equal in magnitude and opposite in direction, they cancel each other out.
When the net force is zero, it means that the forces are balanced, resulting in no acceleration or movement of the object. The box would remain at rest or continue moving at a constant velocity if it was already in motion.
Therefore, the correct answer is A. 0N, as there is no net force acting on the box.
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X-ray crystallography is a very important process that is used to help identify the structure of molecules. What exactly does this process show?
Answer:
can reveal the precise three-dimensional positions of most atoms in a protein molecule because x-rays and covalent bonds have similar wavelength, and therefore currently provides the best visualization of protein structure.
Because x-rays and covalent bonds have comparable wavelengths, they can now give the finest imaging of protein structure because they can reveal the precise three-dimensional locations of the majority of atoms in a protein molecule.
What is X-ray crystallography?
X-ray, a scientific technique called crystallography may be used to map out the atoms of a crystalline material in three dimensions. By using most crystalline materials' interatomic gap as a diffraction gradient for x-ray radiation, which has wavelengths on the order of 1 angstrom, this method makes use of the interatomic spacing of most crystalline solids.
Wilhelm Rontgen made the discovery of x-rays in 1895. Up until 1912, there remained disagreement about whether x-rays constituted electromagnetic energy or particles. Researchers recognized that this light's wavelength would need to be in the range of 1 Angstrom (A) if the wave theory was accurate.
It would be necessary to use a gradient with separation on the same order of magnitude as the light for diffraction and measurement of such tiny wavelengths.
To diffract the x-ray beams, the arrangement of the atoms must be in an ordered, periodic form. The specific arrangement of atoms in that crystal is then revealed through a sequence of mathematical computations to create a diffraction pattern. The principal technique still in use today for studying the structure and bonding of organometallic compounds is X-ray crystallography.
Therefore, since x-rays and covalent bonds can display the precise three-dimensional locations of the majority of atoms in a protein molecule, they provide the best imaging of protein structure currently achievable.
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15
MULTIPLE CHOICE QUESTIONS
PART A:
Choose the correct answer to each question from the alternatives A, B, C or D. Write +
of your choice in the box provided.
QUESTION 1
isted below are some characteristics of surface areas for gas exchange. Which one of
ecessary for effective gas exchange?
B.
Soft
Thin
D.
Surrounded by ca
Moist
Answer:
thin
Explanation:
so there is faster diffusion rate and also there will be short diffusion distance which therfore will lead to effective exchange:)
What is natural selection and how does it drive the evolution of a virus?
This animal has a protostome developmental pattern and a trochophore larva. Identify the major clades that this animal belongs to
Answer:
Lophotrochozoans (it is a protostome)
Explanation:
Lophotrochozoa is a group (clade) of protostome animals, i.e. animals that undergo a developmental pattern in which the blastopore develops into the mouth. Lophotrochozoa clade includes bryozoans, annelids, molluscs, brachiopods, and platyhelminthes. Most lophotrochozoans have either a lophophore or trochophore larvae during the planktonic stage. A trochophore larva is a marine planktotrophic larva with several bands of cilia that form the locomotory organ (i.e., the prototroch), which is only found within the Lophotrochozoans.
When the larva and the adult form of an organism are different from each other this type of development is called indirect development. For example Porifers and platyhelminthis.
the larval form is Lophotrochozoans (it is a protostome)
Lophotrochozoa is a group (clade) of protostome animals, i.e. animals that undergo a developmental pattern in which the blastopore develops into the mouth.
Lophotrochozoa clade includes bryozoans, annelids, molluscs, brachiopods, and Platyhelminthes.
Most lophotrochozoans have either a lophophore or trochophore larvae during the planktonic stage. A trochophore larva is a marine planktotrophic larva with several bands of cilia that form the locomotory organ (i.e., the prototroch), which is only found within the Lophotrochozoans.
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Choose one biogeochemical cycle and explain.
what are the childhood disease?
Answer:
well childhood disease is diseases that happens in childhood like chickenpox and etc
I hope it helps
[tex]\huge\textbf{Answer :-}[/tex]
[tex]\large\underline{\textsf{\textbf{Childhood Diseases}}}[/tex] are diseases that mainly occur or become symptomatic when a person is a child (0 - 18) years. The term is quite self-explanatory. Few examples will be ➟ Common Cold, whopping cough etc. Most of the childhood diseases are not dangerous.
____________________
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
꧁❣ ʀᴀɪɴʙᴏᴡˢᵃˡᵗ2²2² ࿐
Protein misfolding causes ____.
a.arthritis
b.Creutzfeldt-Jakob disease
c.schizophrenia
d.immunodepression
e.tuberculosis
Answer:
b
Explanation:
Explanation:
everything can be found in the picture
*Which of the following are all direct methods of flood contro
a. soil conservation, dams, artificial levees
b. dams, artificial levees, overflow channels
C. floodplains, artificial levees, dams
d. dams, overflow channels, soil conservation
is meiosis similar to mitosis true or false
Answer: Meiosis and mitosis are both cell division cycles that result in daughter cells. Meiosis occurs in the gametes, while mitosis occurs in all non-gamete cells. Meiosis also results in two cell division rounds, whereas mitosis only has one cell division round.
For the following data calculate the MEDIAN.
5, 6, 6, 4, 3, 2, 2, 2, 1,3
Answer:
Mean: 3.4
Median: 3
Mode: 2
Range: 5
Minimum: 1
Maximum: 6
Explanation:
PUT THE NUMBERS IN ORDER TO FIND THE MEDIAN
1, 2, 2, 2, 3, 3, 4, 5, 6, 6
The median is the central number of a data set. Arrange data points from smallest to largest and locate the central number. This is the median. If there are 2 numbers in the middle, the median is the average of those 2 numbers.
Which of the following junctions binds a cell to another cell and is linked to keratin intermediate filaments?
a. desmosome
b. tight junction
c. adherens junction
d. hemidesmosome
Which statement describes Mendel’s hypotheses regarding gametes?
A) gamete carries two genes for a trait.
B) gamete carries one allele for a gene.
C) gamete can carry multiple alleles for a trait.
D) Some gametes are dominant and some are recessive.
Answer:
The correct answer is B. A gamete carries one allele for a gene.
Explanation:
Gamete (also called sex cell or reproductive cell) is a haploid cell (having half number of chromosome as compared to the parent cell) that is produced through a cell division, termed as meiosis in sexually reproducing organisms.
According to the Law of segregation given by Gregor Mendel-
During the process of gamete formation, the two alleles of each gene segregate from one another so that a gamete carries one allele for a gene.
Thus, option B) is the right answer.
Answer:
B.
Explanation:
which of the following are structures common to all chordates? choose all that apply a dorsal nerve cord b, lungs c, true jaws d, pharyngeal breathing apparatus e, backbone
Answer:
tbh, dk
Explanation:
lol
Match the muscle with its type.
1 deltoid:
2 triceps:
.
3 heart:
.
4 sartorius:
.
5 intestine:
.
6 veins:
.
7 biceps:
.
8 trapezius:
.
9 stomach:
.
10 gastrocnemius:
.
a cardiac
b smooth
c striated
Answer:
1 deltoid: striated
2 triceps: striated
3 heart: cardiac
4 sartorius: striated
5 intestine: smooth
6 veins: smooth
7 biceps: striated
8 trapezius: striated
9 stomach: smooth
10 gastrocnemius: striated
Explanation:
Striated muscle is a type of tissue composed of repeated functional units called sarcomeres, which are the basic contractile unit of the muscle fiber. The striated appearance is caused by repeating bands of actin and myosin proteins. Striated muscle tissue is subdivided into two major parts: 1-cardiac muscle and 2-skeletal muscle. Skeletal muscle is a highly dynamic tissue that is mostly attached by tendons to the bones in the skeleton. This voluntary tissue (skeletal muscle tissue) is composed of multiple fascicles or bundles of muscle fibers. Moreover, cardiac muscle tissue, also known as myocardium, is a type of striated muscle that contracts and releases involuntarily, composed of cells called myocytes present in the heart. Finally, smooth muscle is a type of involuntary and non-striated muscle tissue localized within the walls of organs/structures (i.e., intestine, esophagus, stomach, uterus, urethra, bladder, blood vessels, etc.).
10. Which process uses special proteins on the surface of the membrane
to identify specific molecules for transport into the cell?
a. phagocytosis
b. pinocytosis
C. receptor-mediated endocytosis
d. exocytosis
Answer:
C. Receptor-mediated endocytosis
Click the - button that is to the left of the intensity scale to zoom out such that the top of the scale is at 100. Move the temperature slider to that of the Sun. The red part of the thermometer on the far right should just be touching the line marked Sun. Approximately what temperature is the surface of the Sun?
Answer:
5,500°C - 6,000°C
Explanation:
Approximately, 5,500°C - 6,000°C temperature is the surface of the sun.
What is thermometer?
An instrument for measuring and indicating temperature, typically one consisting of a narrow, hermetically sealed glass tube marked with graduations and having at one end a bulb containing mercury or alcohol.Which expands and contracts in the tube with heating and cooling.Learn more about thermometer below,
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write a story about how warmer weather changes the biome you live in
Fevers (below 102ºF):
a
Damage essential proteins in your body
b
Inhibit the growth of pathogens and stimulate macrophage action
c
Occur late in the disease process, after the pathogen is almost eliminated
d
Require emergency treatment
Answer:
Inhibit the growth of pathogens and stimulate macrophage action
The correct answer is B
Mike is studying the phylogenetic tree for big cats.
A big cat phylogenetic tree is shown. A bracket goes to clouded leopard and to another bracket. That bracket goes to 2 additional brackets. One bracket goes to tiger and snow leopard. The other bracket goes to janguar and another bracket. The other bracket has lion and leopard.
He made several statements about the tree. Which statement is not true?
The leopard is more closely related to the jaguar than to the snow leopard.
The leopard is more closely related to the tiger than to the clouded leopard.
The leopard is more closely related to the snow leopard than to the clouded leopard.
The leopard is more closely related to the tiger than to the snow leopard.
Answer:
D
Explanation:
edg 2022
Which statement about blomes is true?
A. Different blomes share similar plants and wildlife.
B. Each blome has only one ecosystem.
C. There are only three blomes on the Earth.
D. Blomes are determined by climate zones.
Answer: D. biomes are determined by climate zones
Explanation:
The enzyme could become spatially distorted, thus reducing the ability of the active site to catalyze the reaction. Tight enzyme-substrate binding will reduce the forward rate constant for the reaction. Tight binding of the enzyme to its substrate will pull the substrate out of solution, thus decreasing the driving force for the forward reaction. Tight binding of the enzyme to its substrate will result in the enzyme-transition state complex being higher in energy than with weaker binding. All of the above.
Answer:
All of the above.
Explanation:
All the given options are the potential disadvantage of an enzyme that have a very high affinity for its substrate.
The enzyme can be distorted spatially and thus reduces the ability to catalyze the reaction of the active site.
The tight binding of an enzyme to a substrate results in enzyme transition state complex which is higher in energy.
The tight binding also pulls the substrate out of the solution and decreases a driving force in the forward reaction.
Genotypes are the genes of an organism with alleles represented by letters of the alphabet. Phenotypes are an organism's observable inherited characteristics.
True or False?
Answer:
True
Explanation:
This is correct for both Genotypes and Phenotypes.
Answer:
True
Explanation:
Genotype is been represented by the letters of a certain gene
and Phenotype is the physical look of an organism
Density is mass per unit of volume. Which pair of lab instruments would a student use to measure the density of seawater?
answer:
a balance and a graduated cylinder
Explanation
Density is mass per unit and it is property characteristic of a substance. The arrangement of the mass of atoms and their size is what determines the the density of a substance.
For a student to measure the density of seawater he/she is required to use a balance and a graduated cylinder where a balance will be used to measure the mass of the mineral sample and then a graduated cylinder to determine the volume.
The total magnification produced from a 15x ocular and a 4x objective would be
Fill in the blank below with the vocabulary word that best completes the sentenc
is the science of naming and classifying organisms based on structura
genetic evidence
which method of evolution best defines the figure:
A. fossilization
B. non-random mating
C. natural selection
D. gene flow
Answer:
C) Natural Selection
Explanation:
trình bày cơ chế hấp thụ và chuyển hóa lipid từ đường tiêu hóa ở người?
What type of microscope can detect density differences and thereby see organelles in living cells
Answer:
fluorescent microscope
Explanation:
fluorescent microscope. phase-contrast microscope
