What chemical bond is responsible for the paring of the nitrogenous bases in a DNA molecule?

Why is reducing caloric intake insufficient for a person to loose weight in a healthy way?

garri49 [273]

Because there are several factors that determine weight loss or gain and reducing calorific intake is just one of them (for reducing weight loss). Other factors that should be considered is exercise. Doing regular exercise ensures that the metabolic rate of the body is increased so much of the calories are burned even after intake. Having a lower metabolic rate can result to increased weight gain even with low calorie intake.

3 0

3 years ago

Do you think that having chloroplasts gives plant cells an advantage over animal cells? give support for your opinion.

mote1985 [20]

Animals have many advantages. But plants can make food anywhere there is sunlight/ultraviolet rays. So no need to hunt unless you're a Venus Flytrap. So plant cells can sustain themselves easier to a degree. As with many things in biology, it all comes down the the circumstances.

4 0

3 years ago

Which activity would be an appropriate first step in designing an experiment

mrs_skeptik [129]

Well, if you look at the scientific process, the first step is to have a question to base it on.

6 0

3 years ago

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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 = $\frac{1}{4}*\frac{1}{2}$

= $\frac{1}{8}$

4 0

3 years ago

why is it safer to eat smaller fish with shorter life spans (salmon) than it is to eat lager fish with longer lifespans (tuna)?

Vilka [71]

Because longer life spans are bad for hormones and shorter are good for lungs.

3 0

3 years ago

What chemical bond is responsible for the paring of the nitrogenous bases in a DNA molecule?​

What chemical bond is responsible for the paring of the nitrogenous bases in a DNA molecule?