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garri49 [273]
3 years ago
7

A scientist wishes to determine the effect of a digestive enzyme on starch digestion (starch is broken down into glucose). The e

xperimental setup is to mix the enzyme with starch in a test tube, stop the reaction after a known period of time, and then measure the amount of glucose produced.
Which of the following is the correct experimental control?
Biology
1 answer:
Sladkaya [172]3 years ago
4 0

Answer:

An identical setup but replacing the enzyme with an equal volume of water

Explanation:

When carrying out any experiment, it is important to set out a control in order to increase the reliability of the data and results.

The control minimizes the effects of variables other than the independent variable.

In the above experiment, starch has to be eliminated and replaced with water. Water does not have starch hence the digestive enzyme being tested will not have any effects making the data and results from the experimental group reliable.

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What type of symmetry does an organism have if it has five identical parts extending from a central hub? A. bi-radial symmetry B
lapo4ka [179]
Pretty sure it <span>C) penta-radial symmetry.</span>
4 0
3 years ago
In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If two red-eyed heterozygous
maw [93]
So here we have two heterozygous organisms that will mate. You can put them into a Punnet square, just to be sure of your answers and to find all possible genotypes : 

      R      r
R  RR   Rr
r   Rr     rr

So you have RR, Rr and rr as your possible genotypes. 
6 0
3 years ago
A go cart rolling at a speed of 2 m/s begins to accelerate down an inclined street at a constant rate of 1.5 m/s¶. It takes the
sammy [17]

Answer:

11\frac{m}{s}

Explanation:

As per the Newton's first law of motion,

v = u + at\\

where "v" is the final speed

"u" is the initial speed

"a" is the acceleration

and "t" is the time taken

Substituting the given values in above equation, we get -

v = 2 + (1.5)*6\\= 2 + 9\\= 11 \frac{m}{s}\\

The cart be traveling at a speed of 11 \frac{m}{s} by the time it reaches level ground.

3 0
3 years ago
Review the chart, which shows the population sizes of three African animals in 1990 and in 2000.
iren2701 [21]

The explanation which is best supported by the numbers in the chart is that Lion and cheetah populations compete for the food source of zebras, and lions outcompete cheetahs. Thus, the correct option is A.

<h3>What is Competition in the population?</h3>

Competition in population may be defined as the existence of two or more same or different species that are actively fighting over the same resources and factors that they disseminate.

Competition and predation are the two types of species interaction through which the population of species either increases or decreases.

According to the given chart, it is noticeable that the population drop in predator cheetah and lion populations because of the reduction in zebra lowering population but the in cheetah population is additionally than that of the lion.

Therefore, the correct option for this question is A.

To learn more about Competition, refer to the link:

brainly.com/question/1638475

#SPJ1

4 0
2 years ago
Suppose that xylem were located only in the roots and stems of a plant. Would fluids in the
schepotkina [342]

Answer:

What if xylem were only located in the roots and stems, would fluids still move? No because xylem have stoma that enables transpiration to happen. If you remove xylem, you've removed that "vacuum" that pulls that water upward

Explanation:

4 0
3 years ago
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