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3 years ago

Which statement best defines a protist?

1 answer:

8 0

Protists obtain food in 3 ways. They produce their own organic molecules, ingest, and absorb. Ingestive protists ingest food, or engulf bacteria. These protists extend their cell wall and cell membrane forming a food vacuole around the food item. Inside the food vacuole, enzymes digest the food. Absorptive protists on the other hand, absorb food molecules across their cell membrane which takes place through diffusion. Absorptive protists play a key role in decomposition. They are considered as important decomposers. Major producers like photosynthetic protists use light energy to manufacture their own food.

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What are two ways that moving water can be used as an energy source

Zigmanuir [339]

I may be wrong but i think that they are
1. turbines are added under the water and when the movement of water effects that is uses power to gather electricity
2. there are big barries in the water that spin the water around and then that in turn creates energy

6 0

2 years ago

The brain volumes (cm cubed) of 20 brains have a mean of 1116.2 cm cubed and a standard deviation of 127.7 cm cubed. Use the g

Shkiper50 [21]

Answer:

Yes

Explanation:

Range rule of thumb predicts the Range to be a multiple of 4 of the standard deviation or to be four times the standard deviation. Making the usual values equal to 2 standard deviations distanct of the mean of the data distribution.

In a given distribution with mean and standard deviation that is obtained, the usual values in mean (as seen in the attached image).

2*standard deviation and mean + 2*standard deviation.

If the data point is not up to the mean

- 2* standard deviation is taken to be significantly low.

If the data point is more than the mean

+ 2*standard deviation is taken to be significantly high.

Let's take the xbar to be the mean and s as standard deviaiton

Given,

mean, xbar = 1116.2

standard deviation, s =127.7

The range rule of thumb shows that the usual values are within 2 standard deviations from the mean

Lower boundary

= xbar - 2s

= 1116.2 - 2(127.7)

= 860.8

Upper boundary

= xbar + 2s

= 1116.2 + 2(127.7)

= 1371.6

We should note that 1411.6 is not between 860.8 and 1371.6, which connotes that 1411.6cm^3 is unusually high.

3 0

2 years ago

What is an advantage of performing a series of dilutions vs. a simple dilution?

Marrrta [24]

Answer:

The series dilution method is the step wise dilution technique where the dilution factors remain constant in each step.

The advantages of using the series of dilution method over simple dilution are stated below:

a) Aids in reduction of a dense culture of cells to a more usable concentration.

b) In every step of dilution the specific amount of bacteria is removed. 

c) Helps in the estimation of concentration of an unknown sample.

This sums up the advantage of using the series dilution technique.

3 0

3 years ago

What cell process is controlled by the nucleus?

SVETLANKA909090 [29]

Protein synthesis is controlled by the nucleus

3 0

3 years ago

Read 2 more answers

How do enzymes affect a chemical reaction, making it easier to occur?

sergey [27]

Answer:

Enzymes speed up a chemical reaction making the reaction easier to occur.

8 0

2 years ago