Question 1

Which structure works to prevent reflux of gastric contents by contracting and relaxing?

Options :

A : Esophageal muscularis

B : Lower esophageal sphincter

C : Upper esophageal sphincter

D : Angle of His

Answer: B

Question 2

Review the image below.

If each division in the ocular micrometer below equals 25 micrometers, what is the length of the oval?

Options :

A : 100 micrometers

B : 500 micrometers

C : 200 micrometers

D : 400 micrometers

Answer: C

Question 3

The table below shows the average daily requirements of essential amino acids in the diet at various stages of human life.

Which of these amino acids is required in the greatest amount in the diet of toddlers?

Options :

A : Lysine

B : Phenylalanine and tyrosine

C : Leucine

D : Valine

Answer: C

Question 4

Review the scatter plot of hours students studied for a test and their results.

What can you conclude from the graph?

Options :

A : Test scores are higher when no hours are spent studying.

B : As hours studied increase, test scores tend to increase.

C : There is no relationship between hours studied and test scores.

D : As hours studied increase, test scores tend to decrease.

Answer: B

Question 5

The diagram below shows the rough endoplasmic reticulum of a cell as seen under the electron microscope.

The structures labeled Z are the site of protein synthesis.

Z is indicating

Options :

A : mitochondria.

B : ribosomes.

C : centrosomes.

D : chromosomes.

Answer: B

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