Compare and contrast how B cells and T cells respond to pathogens.

Answer:

the cell will die

Explanation:

its chromosomes, an enzyme called cyclin dependent kinase, or CDK, will not activate the cyclin, and the cell cycle will not proceed to the next phase. The cell will undergo cell death

Answer:

i hope it will help u bestie

Explanation:

Each year, many people look forward to the winter solstice, which usually falls on December 21 and is the shortest day of the year, because they know after that, there will be progressively more daylight each day.

Answer:

kiwi. :)

Explanation:

Answer:

kiwi

Explanation:

Answer:

Scabies Mites are Micro Arthopods

Answer:

The threshold photon energy for DNA damage = 4.28 eV

Explanation:

According to the Planck - Einstein's equation, the energy of a photon, E is proportional to its frequency; E = hf where f is frequency and h is Planck's constant.

Also, frequency, f = velocity /wavelength

f = c/λ where c is the velocity of light

E = hc/λ

h = 6.63 × 10^-³⁴ Js;

c = 3.0 × 10⁸ m/s;

Threshold wavelength, λ = 290 nm = 2.9 × 10^-7 m

E = (6.63 × 10^-³⁴ × 3.0 × 10⁸) / 2.9 × 10^-⁷

E = 6.85 × 10^-¹⁹ J

1 ev = 1.602 × 10^-¹⁹ J

6.85 × 10^-¹⁹ J = 6.85 × 10^-¹⁹ J × 1 eV / 1.602 × 10^-¹⁹ J = 4.28 eV

Therefore, the threshold photon energy for DNA damage = 4.28 eV

Answer:

the answer for ur question is D

Answer:

1. Beak shape and depth

2. Long beaks; short beaks

3. Tall beaks; shallow beaks

4. Protein

5. Genes; macroevolution

Explanation:

Two genes, CaM and BMP4, control beak shape and depth, respectively, in finches. High levels of CaM expression will result in long beaks, whereas low levels of CaM expression will result in short beaks. High levels of BMP4 expression will result in tall or deep beaks, whereas low levels of BMP4 expression will result in shallow beaks. Therefore, the degree of expression and, consequently, the amount of protein produced, affects beak development in utero. Therefore, small changes to the genes within a developing embryo could result in the formation of new species, providing both evidence and a mechanism for macroevolution .

Note:

The BMP4 gene is the gene for Bone morphological protein 4. It determines how deep or tall the beak will be.

The CaM gene is the gene for Calmodulin. It regulates how long a beak will grow.

Answer:

Solution:

plant's takes carbon dioxide ,water ,sunlight,and minerals and produce glucose and excrete out oxygen:

Answer:

Spleen

Explanation:

The is because the spleen is an organ found in upper section of the abdomen spleen acts as a filterand it help to remove old and damaged cells . It also play a major role in controlling the amount of blood and blood cells that move round the body. The spleen also helps remove pathogens. It contains white blood cells called lymphocytes and macrophages.

*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆

Answer: A) The 2 different ecosystems of green and brown plants

Explanation:

This is the independent variable because it will change the dependant variable of which how many brown and green beetles survive.

I hope this helped!

<!> Brainliest is appreciated! <!>

- Zack Slocum

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Answer:

I think it is B

Explanation:

Im sorry if i am wrong

Hello Milan!

Answer:

rrFf

Explanation:

In this question, we’re talking about two traits, which means that we will represent their genotypes with four letters ( two letters for each trait, since one trait is present in two chromosomes -pair-, one from the mother, and one from the father, revise if you don't get it, or just ask me).

First, let’s make everything clear:

Capital letters are for dominant traits (if one dominant trait is present in the genotype, it will be shown as the phenotype of a person)

Small letters are for recessive traits (if both chromosomes have the recessive trait, it will be shown as the phenotype)

( one letter = one allele )

R : not-red hair         r : red hair

F : freckles                f : plain skin

Second, let's write down every possible genotype for each person:

Let's start with Jenny, she has a recessive trait (red hair) and a dominant trait (freckles). As I mentioned before, we will represent recessive traits in two small letters ( rr for Jenny's red hair ). And in the case of our dominant trait ( freckles), we MUST have at least one capital letter (for this trait: F ). That means we have two possible genotypes for freckles: either Ff or FF.

Now as easy as it sounds, we should write Jenny's possible genotypes like this:

                                    Either rrFf or rrFF

Jenny's mother has brown hair and freckles (two dominant traits), again, as I mentioned before, dominant traits MUST be represented by at least one capital letter.

               Possible genotypes for brown hair:

             either RR or Rr

              Possible genotypes for freckles:

            either FF or Ff

Here, we have the phenotype of one parent of Jenny's mother's parents. Lucky for us, Jenny's grandmother has two recessive traits that can only be presented as rrff.

Why are we lucky? Because Jenny's mother must have inherited one allele of her grandmother, since both of Jenny's grandmother's alleles are the same, we know that Jenny's mother has one r allele and one f allele. We can write down Jenny's mother's genotype like this: RrFf.

Now I ask you to stop reading and try to figure out Jenny's father's genotype.

It is rrff, just like her grandmother.

Finally, let's make a Punnett square for Jenny's genotype:

                  mother:     father:

                    RrFf     x    rrff

( I'm not gonna show you how to make a Punnett square because that's gonna be a tooooooo long explanation, watch this video: https://youtu.be/qIGXTJLrLf8 )

         possible genotypes for Jenny and her siblings:

  RrFf  (phenotype: non-red hair & freckles)

or  Rrff  (phenotype: non-red h & plain skin)

or  rrFf  (phenotype: red h & freckles)

or  rrff  (phenotype: red h & plain face)

If Jenny has red hair and freckles, she MUST have a genotype of rrFf. If not, her mother is cheating XD (or a genetic mutation had happened).

I know I took too long explaining and answering but I hope I helped you,

keep it up!!

The correct genotype Jenny would be - rrFf .

The information we have in this question is:

Let find the genome of her maternal grandmother:

Her maternal grandmother had red hair skin which is a recessive trait and plain skin which is also a recessive trait that means she must have both recessive alleles for each trait as recessive allele express itself in the absence of dominant allele

The genotype of maternal grandmother: rrff

Let find the genome of the mother:

Mother has brown hair and freckles and brown hair is only present in heterozygous conditions if R allele is present with r allele however, Freckles can be in two conditions FF or Ff. The mother of jenny's mother has rrff then she must carry one f allele which concludes that Jenny mother has Ff.

The genotype of mother: RrFf

Let find the genome of her father:

Her father has red hair and plain skin and as we explained that both are recessive traits then the genotype of her father would be - rrff

Finally, the genotype of jenny can find out by the cross between the genotype of her parents:

   (see image for cross)

The genotype of Jenny would be rrFf as red skin is a recessive trait that is only possible with two recessive alleles and for the freckles, there are two possible conditions, Ff and FF that can find out by crossing given in the image.

Thus, the genotype of Jenny is - rrFf

Learn more about alleles:

https://brainly.com/question/14104138

What is the essay’s theme?

Answer:

1) Topographic maps show contours, elevation, forest cover, marsh, pipelines, power transmission lines, buildings and various types of boundary lines such as international, provincial and administrative, and many others. (Answer: Elevation)

2) Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. The diagram illustrates how contour lines show relief by joining points of equal elevation. (Answer: Contour Line)

Answer: They are all heterotrophs I believe.

Explanation:

Answer: Tidal Power

Explanation: correct on test

Answer:

Two kidneys

Explanation:

Most people have two kidneys, however, it is possible to live a healthy and active life with only one functioning kidney.

Answer:

Because the offspring of a male and female are always going to be xx, xx, xy, or xy.

Explanation:

Remember that men have different reproductive chromesomes than women. Women have 2 x chromesomes(xx) while men have 1 x and 1 y(xy). These are given down to their offspring.

So we can write the this out in a punnet square as(link down below).

After you see the visual, you will find that the genotypes are xx, xx, xy, xy.

As I said above, women have sex chromesomes xx, while men have sex chromesomes xy. When you match the genotypes on the punnet square with the ones we know from men and women, we find that two of them match with men and two match with female.

So with this, we can conclude that 2/4 of offspring will always be male and 2 will be female. And as you well know 2/4 is 1/2 which is 50%.