How many cells does a unicellular organism have?

"Patricia is pregnant with her first child and she is concerned about her physical appearance and the weight she knows she will

jeyben [28]

Answer:

Explanation:

Apart from Patricia's concern for her physical appearance and the weight she knows she'll likely gain as her pregnancy progresses, the dietitian will likely advice her not to gain too much weight because apart from her "physical appearance worries", gaining excessive while pregnant can also raise one's risk for birth complications such as C-section delivery and even premature birth.

In addition, the dietitian will likely offer Patricia more guidelines or tips such as:

****Commencing pregnancy at a healthy weight ( between 25 to 35 pounds), gaining more if underweight or gaining less if obese or overweight.

****Eating moderately but often, focusing on small, frequent meals that are high in lean proteins, fruits and vegetables.

****Drinking enough water ( about ten 8-ounce glasses of water) daily as this helps to aid metabolism and digestion as well as constipation prevention while preventing dehydration.

****Learning how to combine something healthy with less healthy cravings in the event of cravings for less healthy foods

**** Taking exercises such as walking very seriously as it helps to burn a great deal of excessive calories

**** Maintaining a recommended weight region at various stages of the pregnancy which will be in the best interest of mother and child

4 0

3 years ago

The solutions in the two arms of a U-tube are separated by a membrane that is

IgorC [24]

Answer:

See the answer below

Explanation:

Recall that: Water potential = pressure potential + solute potential

Since the system is an open one;

Water potential = solute potential = -iCRT

i = number of particles the molecle will make in water (1)

C = molar concentration

R = Pressure constant = 0.0831 liter bar/mole K

T = temperature in kelvin = 22 + 273 = 295 K

To calculate water potential on side A:

C = 1 M

Water potential = - (1 x 1 x 0.0831 x 295) = -24.51 bars

For side B:

C = 2 M

Water potential = - (1 x 2 x 0.0831 x 295) = -49.03 bars

b.

Since side A has higher water potential than side B, water will flow from side A to side B until equilibrium is established between the two sides. Water always flows from the region of higher water potential to the region of lower water potential.

6 0

3 years ago

You encounter a cell that, in addition to other structures, has DNA, ribosomes, and cell wall. It could

Alenkasestr [34]

The answer is A and B

5 0

3 years ago

Populations evolve for many reasons. Suppose there is a small population of birds that have either brown chest feathers or yello

creativ13 [48]

Answer/Explanation:

A. Birds with yellow chest feathers attract more mates and leave more offspring.

Mechanism: The mechanism that is involved in this event is imply that of natural selection. In this event, birds with yellow chest feathers have a greater fitness they attract more mates and leave behind more offspring, as they are selected for by natural selection.

Effect on the gene pool: Since birds of yellow chest feathers have greater fitness, the frequency of yellow feather birds would increase, since more offspring with yellow chest feathers would be produced more than the other bird having the other feather color.

B. A hurricane kills many birds at random.

Mechanism: The mechanism that occurs in this event is simply that of genetic drift. Here, a random change has occurred, which can simply be referred to as the bottle neck effect. Following the disaster, the population size of the bird reduces thereby increasing the chance of allele frequency of the population to change. Genetic drift is occurs more in a small population.

Effect on the gene pool: Allele frequency would change, but not predictably. In other words, since individuals left are chosen by random, and no real idea of which traits would have the highest fitness after the event, we cannot really tell which the pattern of change the allele frequency would take, but we are certain there would be a change in allele frequency.

C. A conservation group releases several new birds to the area, to repopulate the birds. The new birds are predominantly brown feathered.

Mechanism: This event can be described as gene flow, as new members with mostly brown feather are introduced into the population which would eventually bring a change in the gene pool.

Effect on the gene pool: The frequency of brown feather allele will increase. Bearing in mind that the allele frequency of brown feather allele and yellow feather allele is approximately equal, an introduction of new set of birds having mostly brown feathers would definitely bring about a change in the gene pool, leading to more brown feather allele. Hence, frequency of brown feather allele will increase.

8 0

3 years ago

What are two main types of posttranscriptional modifications that take place in the mRNA of eukaryotes?The excision of the intro

Angelina_Jolie [31]

The correct answer is: The addition of a 7-mG cap at the 5' end of the transcript and the addition of a poly-A sequence at the 3' end of the message

These posttranscriptional processes are called:

• 5’ capping - It protects the mRNA from 5' degradation by exonucleases. Cap is also involved in ribosomal binding.

• Polyadenilation or addition of poly(A) tail – It also protects mRNA from degradation of 3’exonucleases. A long poly(A) tail can also increase translation.

4 0

3 years ago