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3 years ago

6

What does the model suggest about a mechanism for regulating ph in a organism?

1 answer:

gogolik [260]3 years ago

4 0

<span>C02 regulation, the carbonic acid-bicarbonate buffer regulation, H+ regulation, and gas exchange. These regulations are all done through the circulatory, excretory, and respiratory systems. They are all part of one big function, that is homeostasis.</span>

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B) What must happen before mitosis can begin? (1 point)

Lostsunrise [7]

Answer: it must go through a period known as interphase.

Explanation:

Before a cell can enter the active phases of mitosis, however, it must go through a period known as interphase, during which it grows and produces the various proteins necessary for division.

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2 years ago

At concentrations of 0.1-1 g/mL. colchicine, a natural plant product, can cause the mitotic arrest of dividing cells at metaphas

Nataly_w [17]

Answer:

A Microtubule organization of spindle fibers.

7 0

2 years ago

Cellulose belongs to a group of molecules called what

vovikov84 [41]

Polysaccharides
Hope that helps!

6 0

3 years ago

22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit

mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square ( $X^2$ ):

$X^2$ = $\frac{(O - E)^2}{E}$ where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The $X^2$ is calculated thus:

Phenotype O E $X^2$

1 88 164.81 $\frac{(88 - 164.81)^2}{164.81}$ = 35.80

2 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

3 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

4 81 18.31 $\frac{(81 - 18.31)^2}{18.31}$ = 214.64

Total $X^2$ = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

$X^2$ tabulated = 7.815

<em>The calculated </em> $X^2$ <em> exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently. </em>

4 0

3 years ago

Which color of visible light has the shortest wavelenths

il63 [147K]

Violet, as it has the shortest wavelength on the colour spectrum

7 0

3 years ago