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3 years ago

Our nostrils has hair and mucous. What is the need to have them in our nasal cavity?

Biology

1 answer:

Aloiza [94]3 years ago

7 0

the nostrils catch the big dust particles while the small and escaped dust particles from nostrils stick to the mucous

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what is the force needed to move a boy and his wheelchair with a combined mass of 30kg at 0.4 meters per square second

vichka [17]

Answer:

The force needed to move a boy and his wheelchair with a combined mass of 30kg at 0.4 meters per square second is 12 newton.

Explanation:

According to Newton's second law based motion "the moving object's acceleration is based upon two terms - one is the total force acting upon that object and the other one is the net mass of the object."
In mathematical term, F=ma. where F= force, m= mass, a= acceleration.
So, by performing the calculation, $\bold{\mathrm{F}=30 \times 0.4 \mathrm{N}=12 \mathrm{N}}$
12N force will move the boy along with the wheel chair.

8 0

3 years ago

Which of the following would most likely be the effect of a mutation in DNA?

DochEvi [55]

Answer:

Explanation:

i take the test

3 0

3 years ago

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A planet has an orbital period of 3.24 years. What is the average distance of the planet from the sun?

Brut [27]

Answer;

-5.83 AU

Explanation;

A year is defined as the time it takes a planet to complete one revolution of the Sun, for Earth this is just over 365 days. This is also known as the orbital period. Unsurprisingly the the length of each planet’s year correlates with its distance from the Sun.

Using the equation;

t² = a³

t = 3.24 years, the time it takes the planet to orbit .

a (astronomical units) = 3.24 ^3/2

= 5.83 anatomical units (AU).

4 0

3 years ago

Read 2 more answers

In Drosophila, genes a and b control body size and color, respectively. Large body (a+) is dominant over miniature (a), and gray

frutty [35]

Answer:

Female gametes:

ab= 0%

ab+=0%

a+b=0%

a+b+=0%

for the miniature phenotype to occur, it is necessary to contain two recessive characters and the female must have both for it to occur, if it is homozygous for b + it will have 2 alleles b +, understanding that the female is aab + b it will only occur gametes ab +

2. Phenotype

Miniature body + gray=25%

Large body +gray = 50%

Large body +ebony = 25%

Miniature body +ebony =0%

As the crossing cannot occur in males, the gametes it can produce are: ab + and a + b. Although the crossing can occur in women. The gametes produced are: ab +, a + b, ab and a + b +.

the crossing occurs only in the females generating the gametes ab +, a + b, ab and a + b +

The genotypes corresponding to:

Punnet graphic

large gray body: a + ab + b, a + ab + b +, a + a + b + b

big body and ebony: a + a + bb, a + abb

miniature and gray body: aab + b +, aab + b

6 0

3 years ago

Describe the effect of amanitin on the maximum elongation rate for the wild-type and modified RNA polymerases. Determine the rat

Ainat [17]

Answer:

Average max. elongation rate = modified RNA pol./ wild type RNA pol = 2/12 = 0.166 nucleotides per sec.

Explanation:

After treating the wild type and experimental RNA with amanitin solution, the amanitin actively binds to the active site of wild type RNA polymerase, inhibiting addition of nucleotides and also it interferes with the motility of RNA pol. along the DNA template, due to which their is a sharp decline in maximum elongation rate of mRNA. In case of experimental RNA polymerase, due to single base substitution the experimental strain is already having very low elongation rate, but binding of amanitin causes constraint on the motility of RNA polymerase through the DNA template, thereby decreasing the elongation rate. Average max. elongation rate = modified RNA pol./ wild type RNA pol = 2/12 = 0.166 nucleotides per sec.

3 0

3 years ago