Hot answers tagged homework
11
By frame size, do you mean sliding window?
I know that if you want to predict a secondary structure of a transmembrane protein, then your window size should be 20 amino acids (this is the average length of 1 transmembrane alpha helix spanning through the membrane).
I found this paper by Chen, Kurgan, and Ruan[1].
It basically says that the window size ...
6
Your approach to translate the AA sequence, codon by codon, was correct. This was a bit of a trick question because to recognize it, you had to read the sequence backwards.
UGG-CAA-GGT-CAC etc is read directly off of the 3'->5' strand of the circled answer, reading from right to left.
The bottom left is a red herring because it starts with a start codon, ...
6
Let's take Question A:
Both fathers have siblings with red ears, and red ears are an autosomal recessive trait. The grandparents did not have red ears, we know then that they were carriers of the recessive allele. Each grandparent was Nr (for Normal and red alleles respectively).
The fathers have normal ears, so they could be NN (probability 0.33) or Nr ...
6
Still if you change your question as (If histidine is abundant, HisP's job is to stop the histidine pathway as a "repressor." If HisP binds less tightly to promotors, the pathway should not produce as much histidine.)
Then it should be under another assumption that what is the effect of HisP binding promoter of enzyme's gene. Is it suppressing the ...
6
Every nucleotide sequence has six possible reading frames, because each codon determining one amino acid consists of a base triplet (3 frames), and there is a complementary strand which could be coding (3 reverse frames).
To find the possible open reading frames contained in your sequence, you have to look for start codons. That is: ATG. But, as said the ...
6
Assumptions: Blonde hair is Homozygous Recessive and that the traits are strictly Mendelian.
The parental generation must be both heterozygotes as at least one child is Blonde (bb). So your cross is Bb x Bb.
Your square is going to look like this:
_B_ _b_
_B_ BB Bb
_b_ bB bb
So of the ...
5
Read "supply" as "carry action potentials to." When the action potential reaches the junction with the muscle (i.e., the neuromuscular junction), neurotransmitters are released into synapse. A similar membrane depolarization occurs on the muscle cell, ultimately leading to contraction.
Nerves visible to the naked eye are actually bundles of individual axons ...
5
In humans, the amnion (amniotic sac) persists from the primitive amniotic cavity1. One side of this is formed from the cytoblast (a prismatic epithelium) and the plasmodioblast. Together these two layers are the ectoplacenta or chorion. They are also referred to as Rauber's layer. These replace the lining epithelium of the uterus, whereupon internal ...
5
You're right in saying that yeast is single celled.
However, moulds are described to be filamentous fungi that are multicellular. The filaments of the mould give colonies "a woolly, fluffy, or velvety appearance, sometimes punctuated with a granular or powdery aspect that is produced by the formation of asexual reproductive structures"(1).
Aspergillus is ...
5
If the question is about the one and only most important difference between mitosis and meiosis, then the answer "meiosis reduces ploidy" is probably correct. But if the list of important differences is open, it would be critical to add that mitosis generates identical cells (identical to each other and any ancestral cells, barring rare new mutations), while ...
5
A) Here is the correct map:
You made a mistake on your map at the PvuII site (it is not on 6.5kB from the start of the plasmid, but on 6kB).
Can the Kpn I not go on the 8.5 site, it still creates the 2 and 8.5, so isn't there more than 1 correct option for plasmid map?
Yes. What you need to do in order to make the correct map is try all possible ...
5
In high school, we did an experiment that showed this.
Basically, if you take a glass of water, and let it sit out, perhaps in front of an open window, it will eventually lose water due to evaporation. It may take a few days/weeks to really see a large difference, but the level will go down. But, if you take a few flexible straws, put them in so the bendy ...
5
To be honest I know very few about enzymes and absolutely nothing about Michaelis–Menten.
However, when I "took the Michaelis-Menten equation, replaced v with 0.4Vmax, canceled the Vmaxes (one on each side), and solved for [S]", my result is positive:
0.4 * Vmax = S * Vmax / ( Km + S )
0.4 = S / ( Km + S )
S = 0.4 * Km + 0.4 * S
0.6 * S = 0.4 * Km
S = Km * ...
4
It's hard to understand the question, but in any immunocytochemical staining such as the above, you have two different types of reactions:
the antibody binding to the target (in this case, some laminin)
the peroxidase-based colorimetric reaction with DAB. DAB (3,3'-diaminobenzidine tetrahydrochloride) is oxidized in the presence of hydrogen peroxide to ...
4
As mentioned above, the largest perennial herbaceous plant is indeed the banana. Whilst the main reference to this ("Yes, we have more bananas" - an article in the Royal Horticultural Society Journal from May 2002) has been removed from their website it would be I'm sure possible to order should you need to.
This summary of the banana mentions that the ...
4
DAPI (4',6-diamidino-2-phenylindole) preferentially binds AT-rich DNA (although it binds CG-rich DNA, too), which can give chromosomes distinctive banding patterns if they are polytene or in metaphase. In interphase condensed chromosomes, such as the inactive X chromosomes of female mammals (Barr Body), the relatively high concentration of tightly-packed ...
4
After an RNA has been transcribed, in eukaryotes it is spliced before it leaves the nucleus. This means that parts of the RNA are removed (called introns) and the ends are capped. The parts left over in the mature mRNA after removing the introns are called exons.
The mRNA does not have to start with a start codon. There can be sequences before and after the ...
4
After talking to my teacher, he said that biological control is the introduction of species to control another species, however species may be introduced for other reasons (the "Introduced Species" method), such as to "assist an ecosystem cope, flourish or re-establish itself."
The example he gave was the introduction of South African veldt grass to ...
4
Since the sequence starts with an initiation codon and ends with a stop codon I think it's safe to conclude that this is the coding strand. The coding strand has the same sequence as the transcribed RNA (except T>U). This is because it is the other strand of the DNA that is the template for the synthesis of an RNA. The RNA is indeed made 5'>3', but the ...
4
Classification of equilibrium points is done on the basis of the eigenvalues.
If the two eigenvalues have no real parts, it is a hyperbolic fixed point and represents undamped oscillation.
If both have a negative real part, it is a stable fixed point. If any of the eigenvalues has an imaginary part then it represents damped oscillations (in that case the ...
3
Based on my course material, I managed to get the following list:
Malaria - Plasmodium falciparum, p. malariae, p. vivax, p. ovale - female anopheline mosquito
Babesiosis - Babesia devergens, babesia microti - tick ixodes ricinus
Balantidiasis - Balantidium coli - waterborne
Coccidiosis & toxoplasmosis - Eimeria species - waterborne
Toxoplasmosis - ...
3
So the DNA in some chromosomes must have the pieces of information about how to do the DNA replication. - I am not sure about thing.
Genomes contain what is called the "origin of replication" - specific sequences in the DNA that tell DNA polymerase where to bind and to initiate replication.
As for your main question, I'm a little confused as to what ...
3
Giemsa is not a particular methid to stain malaria or any other parasite. It stains DNA. As such, it can be used to stain any DNA-containing organism, or, in other words, any known cell.
Regarding its particular use in chromosomal banding, you can refer to many online resources, such as this one of the University of Washington:
Chromosomes in metaphase ...
3
OK, so 2 responses, each concerning different protein segments of different types/functions/structures, but not an answer really getting to the heart of the question. Because of the homework tag, I am tempted not to reply - this is something the student should accomplish on his/her own. So, I'll give a general answer to start you thinking. Basically, such a ...
3
Primary oocytes are formed prenatally and reain suspended in prophase of meiosis I for years until the onset of puberty. An oocyte completes meiosis I as its follicle matures (during ovulation) resulting in a secondary oocyte and the FIRST polar body. After ovulation, each oocyte continues to metaphase of meiosis II. Meiosis II is completed only if ...
3
Wikipedia actually covers this:
Most bilateral animals, including all the vertebrates, are coelomates.
Now, some coelomates have subsequently lost their coelom but primates (actually, I believe, all vertebrates) are not among them. In humans, the coelom forms, amongst others, the pleural cavity.
So, yes: humans do have a coelom that partitions into ...
3
Total solids (TS): The part of the sludge that remain after drying at 105C for 20 hours:((weight; dried at 105C)/(weight; wet))*100 = TS (%)
Volatile solids (VS): The part of the sludge that is combusted at 550C after 2 hours:
((weight; dried at 105C - weight; dried at 550C)/(weight; dried at 105C))*100 = VS (% of TS)
3
Beta-galactosidase (B-gal for short) is an enzyme that will process the substrate lactose. In applications using B-gal as a reporter (lacZ gene), two lactose analogues are commonly used: X-gal or ONPG (as pointed out by @Alan Boyd). Both substrates are colourless, becoming colourless once hydrolyzed by B-gal. The formation of this colour allows B-gal to be ...
3
There are a bunch of possible answers;
On my own property I have such a line. Turned out it was an old fence line. One side was farmed intensely for 90 years, the other side left in bush. The farmed soil is enough different that it doesn't grow good trees. Even the grass is different.
Another place I have an abrupt line of willows. That one turns out ...
2
The rate of transpiration is very closely linked with the rate of evaporation from the leaf surface. Increased air movement across the surface of the leaf (e.g. from a fan) increases the rate of evaporation of water from the leaf surface. This happens because water saturated air is moved away; making the osmotic gradient more pronounced.
As for the ...
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