When would you expect to find the highest rate of air pressure during breathing?

You are observing diseased cells in a medical laboratory. Upon close inspection, you notice that the cells contain many food vac

ankoles [38]

The organelle that could b malfunctioning is the mitochondria, which packages proteins and without protein for cells, the outcome is cell lysis, or destruction.

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4. What is the function of the<br> vacuole?

alukav5142 [94]

Answer:

Explanation:

Vacuoles are membrane-bound sacs within the cytoplasm of a cell that function in several different ways. In mature plant cells, vacuoles tend to be very large and are extremely important in providing structural support, as well as serving functions such as storage, waste disposal, protection, and growth.

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Which is an example of the environment affecting gene expression?

ivolga24 [154]

Answer:

b

Explanation:

some genes being turned off in warm temperatures

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3 years ago

Duchenne muscular dystrophy is an X-linked recessive disease. A phenotypically normal couple wants to start a family. The woman’

Andreyy89

Answer:

$\frac{1}{8}$

Explanation:

From the question: Duchenne muscular dystrophy is an X-linked recessive disease.

Now for an X-linked recessive disorder to be affected by a male individual; it only requires the presence of only one copy of the recessive allele of the disease to be present BUT in a female individual. both copies of the recessive allele must be present.

Let the X-linked recessive disease(i.e Duchenne muscular dystrophy) be = (ⁿ)

However, we are told that the couples are normal and are unaffected. Therefore;

the male partner (XY) will be: $X^NY$

the female partner (XY) will be: $X^NX^N$

Similarly, the question proceeds by telling us that: the woman's brother has the disease.

Definitely, it's possible that this unaffected woman is a carrier of the disease.

So, if she is a carrier; we have her traits to be: $X^NX^n$

NOW, if a cross exist between these couples; we have

$X^NY$ × $X^NX^n$

$X^N$ $Y$

$X^N$ $X^NX^N$ $X^NY$

$X^n$ $X^NX^n$ $X^nY$

So, we have offspring as follows:

$X^NX^N$ = normal unaffected female

$X^NY$ = normal unaffected male

$X^NX^n$ = female carrier for the Duchenne muscular dystrophy disease

$X^nY$ = affected male with the Duchenne muscular dystrophy disease

So, the probability of the child to be affected with the disease = $\frac{1}{4}$

Also, the probability that the first child will be a male or a female = $\frac{1}{2}$

∴

the probability that the couple’s first child will be affected = $\frac{1}{4}*\frac{1}{2}$

= $\frac{1}{8}$

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3 years ago

In the early days of germ theory, contagious diseases were thought to be caused by fungi or bacteria. In the 1890s, Dmitri Ivano

Andrei [34K]

The question above is incomplete, the complete version of the question is given below:

In the early days of germ theory, contagious diseases were thought to be caused by fungi or bacteria. In the 1890s, Dmitri Ivanovski filtered extracts from diseased tobacco plants and discovered that the disease could be transmitted to new plants through the filtrate. He concluded that the disease was caused by particles smaller than bacteria: the tobacco mosaic virus.

Which best explains how Ivanovski’s work led to a change in the germ theory?

A. He tried to promote his hypothesis as a law.

B. He used a new experimental method to test his hypothesis.

C. He used a more powerful bacterial strain than other scientists had.

D. He obtained results that confirmed what other scientists were thinking.

ANSWER

The correct option is B.

The germ theory of diseases states that diseases are caused by microbes. Prior to 1890s, scientists believed that communicable diseases are caused by microorganisms such as bacteria and fungi; viruses were not known during that time. The work of Dmitri Ivanovski on tobacco plant was the one responsible for the discovery of the existence of viruses. Dmitri Ivanovski was able to arrive at the results he obtained because he used a new experimental method to test his hypothesis.

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