Answer: this is because with triplet sequences, diversities would be generated and the possibility of overlapping is minimal
Explanation:
Answer:
Geneticists believe, even before direct experimental evidence was obtained, that the genetic code would turn out to be composed of triplet sequences and be non overlapping because a triplet code gives 64 possible combinations but we only have 20 essential amino acids in our human proteins so there's room for some redundancy. That way some point mutations will still be able to correctly code for the desired protein.
Explanation:
The Genetic Code would turn out to be composed of triplet sequences means that the -
Genetic Code is stored on one of the two strands of a DNA molecules as a linear, non-overlapping sequence of the nitrogenous bases Adenine (A), Guanine (G), Cytosine (C) and Thymine (T). These are the of "letters of the alphabet," that are used to write the "code words."
The genetic code consists of a sequence of three letter "words," (sometimes called 'triplets', sometimes called 'codons'), written one after another along the length of the DNA strand.
Each code word is a unique combination of three letters (like the ones shown below in the attachment) that will eventually be interpreted as a single amino acid in a polypeptide chain. There are 64 code words possible from an 'alphabet' of four letters.
One of these code words, the 'start signal' begins all the sequences that code for amino acid chains. Three of these code words act as 'stop signals' that indicate that the message is over. All the other sequences code for specific amino acids.
However, some amino acids are only coded for by a single 'word,' while some others are coded for by up to four 'words.' The genetic code is redundant.
Genetic codes do not overlap: The genetic code is composed of nucleotide triplets. In other words, three nucleotides in mRNA (a codon) specify one amino acid in a protein. The code is non-overlapping. This means that successive triplets are read in order.
endosperm
a cotyledon
a suspensor
Answer:
endosperm
Explanation:
Double fertilization in angiosperms is a process that ensures both the formation of the embryo, giving rise to a new plant, and the endosperm, a nourishing tissue. Double fertilization is a process in which one gamete joins the oosphere, while another joins the polar nuclei. For this phenomenon to occur, a number of factors are required, which begin with pollination.
The result of double fertilization occurs when the male gamete merges with the female gamete called the oosphere, this fusion is responsible for giving rise to the diploid embryo, which can form a new individual. Already the gamete that fuses to the polar nuclei is responsible for giving rise to the so-called endosperm, which is triploid. In short, after double fertilization a zygote and an endosperm form.
giving the cell a rigid, inflexible shape.
B
allowing water to pass into the cell.
с
protecting the cell from the outer environment.
D
regulating movement of materials in and out of the cell.
Cell membranes have each of the following functions except for giving the cell a rigid, inflexible shape. Thus, the correct option for this question is A.
A cell membrane may be defined as a type of biological membrane which separates the inner surroundings of the cell with respect to the outer environment. It is semi-permeable in nature. It performs numerous functions for increasing the survival of an organism.
Cell membranes generally protect the inner content of the cell along with various organelles from the outer environment. It also regulates the movement of materials in and out of the cell either by simple diffusion or by transporters. It allows the easy passage of water into the cell.
Therefore, cell membranes have each of the following functions except for giving the cell a rigid, inflexible shape. Thus, the correct option for this question is A.
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In population individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype, so the allele frequency of A1 is 0.49.
The incidence of a gene variant within a population is represented by the allele frequency. Alleles are different versions of a gene that share the same genetic locus on a chromosome.
To determine the allele frequency of A1
There is the formula:
frequency of A1 = (2 x number of A1A1) + Number of A1A2/ 2 x population
so, A1A1 = 149
A1A2 = 18
Population = 149 + 18 + 154 = 321
The frequency of A1 = (2 x 149) + 18/ 2 x 321
hence the frequency of A1 = 0.49
Therefore, the allele frequency of A1 is 0.49.
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Answer:
A or b
Explanation:
B. Deep-sea trench
C. Mid-ocean ridge
D. Continental Rift
Mid-ocean ridge most likely forms where the northern pacific tectonic plate meets the oceanic crust of the western North America plate.
The tectonic plates of different parts of the earth's crust are always in motion, causing changes in the planet's landforms .
However the globe would look same due to presence of plate tectonics with a stable climate, mineral and oil deposits, and oceans with a chemical balance.
These plates are mainly 100 km thick, are made up of this crustal layer which continue to float on the warm and thick mantle, and create mountains
These plates are puzzle like matching pieces on the surface of the planet that , the movement of the plates caused by the mantle convection from below the lithosphere.
There are two primary types of tectonic plates such as continental tectonic plates and oceanic tectonic plates. Some plates are large, while some are smaller.
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Dakinki?
because thats who wrote the mona lisa
Answer:
a. Sucrose is present in the plant cells that provide them energy and helps in the metabolic process of the plants. The pH of the plant cells will increase and their cellular environment becomes basic in nature. The uptake of sucrose is pH specific and the acidic condition in the environment allows the uptake of sucrose. The decrease in pH concentration in the environment increases the pH inside the cells.
b. The inhibitor of ATP inhibits the production and functioning of the ATP molecule. This effects the sucrose transport in the plant cells. As the sucrose movement requires the ATP and it is a active transport. The ATP inhibition decreases the sucrose uptake in the plant cells and the sucrose concentration decreases inside the plant cells.
Sucrose uptake in plant cells seems to require an acidic environment, brought about by the active transport of protons which requires ATP. An inhibitor of ATP regeneration would likely slow or stop this transport and, in turn, sucrose absorption.
The reported results suggest that the process of sucrose uptake in plant cells involves acidification of the surrounding medium prior to sucrose absorption. This can be explained by the proton-sucrose symport mechanism, in which protons (H+ ions) are actively pumped out of the cell in a process that requires ATP energy. When these protons combine with water (H2O) in the cell's environment, they form hydronium ions (H3O+), resulting in a lower pH or more acidic environment. Only after this acidic environment is established does sucrose uptake begin.
Based on this mechanism, introducing an inhibitor of ATP regeneration would be expected to decrease or halt this process, since ATP is required for the active transportation of protons. With less ATP, fewer protons will be pumped out, leading to a less acidic environment and, thus, lower sucrose uptake. This hypothesis is supported by how phosphofructokinase, a key enzyme in glycolysis (ATP production), is affected by low pH levels.
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