EmSAT Biology Practice Test With Answers

Engaging with EmSAT Biology practice tests is a highly effective strategy to achieve your target scores on the exam. These practice tests enable you to evaluate your strengths and weaknesses, empowering you to concentrate on areas that require improvement.

Check out the following sample questions for EmSAT Biology, offering you a comprehensive glimpse into the Emirati Standardised Test for Biology.

EmSAT Biology Practice Test Questions and Answers

1. Which of the following macromolecules can often be composed of C, H, and O alone?

A. Carbohydrates

B. Lipids

C. Proteins

D. A and B

2. A student immersed a small piece of potato tissue in a 0.25 mol dm-3 sucrose solution. The tissue shows no change in mass. Which of the following would the student probably find out when the pieces are immersed in a 0.1-mol dm-3 sucrose solution?

A. The mass has increased because water potential of the cells has decreased.

B. The mass has decreased because water potential of the cells has increased.

C. The mass has increased because water potential of the solution has decreased.

D. The mass has decreased because water potential of the solution has increased.

3. The diagram below represents a cross-section of a root. Which of the following substances do tissues “1” and “2” in the cross-section of the root carry?

4. The following graph represents the different phases of the cell cycle in which the X-axis represents the amount of DNA and the Y-axis represents the number of cells. At which phase of the cell cycle are the C population of cells?

A. Cytokinesis

B. S phase

C. G1 phase

D. Interphase

5. The chart below shows the mRNA codons for different amino acids?

Given the following codon sequence.

5’ AUG UCU UAC CUG GCU CGG … UAA 3’

Which of the following can be described as base substitution causing a nonsense mutation in the mRNA sequence below?

A. Substitution of UAC for UAU in the third codon

B. Substitution of UAC for UCC in the third codon

C. Substitution of UAC for UAA in the third codon

D. Substitution of UAC for UGC in the third codon

6. The following pedigree represents the inheritance of an autosomal recessive syndrome in a family.

If the affected male in generation II marries a normal female who is homozygous for the trait, what is the possibility to have an affected child?

A. 0%

B. 25%

C. 50%

D. 100%

7. All of the following steps occur when subpopulations speciate, EXCEPT

A. natural selection divides a population into two or more, forcing them to differentiate.

B. isolated subpopulations adapt to local conditions through natural selection.

C. once the two divergent subpopulations meet again, hybrids will always occur.

D. active selection on differentiated subpopulations to become reproductively isolated

8. Cystic fibrosis is a chronic and frequently fatal genetic disease of the body’s mucus glands. It is caused by an autosomal recessive mutation. In the European population, one out of approximately 10,000 babies is born with the disorder. What is the frequency of the cystic fibrosis allele in the European population assuming the Hardy-Weinberg conditions are met?

A. 0.1

B. 0.01

C. 1.0

D. 0.00001

9. A scientist is studying the phylogeny of 4 species (species 1, 2 3, and 4). To this end, she sequenced a fragment of DNA and she obtained the following alignment:

Species 1 A A T C G G A

Species 2 C A G G T A C

Species 3 A A T C T G A

Species 4 C A T G T G C

Using this alignment, she constructed a phylogenetic tree using the parsimony method (a method that minimizes the number of changes on a phylogeny).

Which of the 4 phylogenetic trees below is supported by the DNA sequences?

A. Tree A

B. Tree B

C. Tree C

D. Tree D

10. The ecological relationship between two different species are shown in the graph below.

What ecological relationship does the graph represent?

A. Mutualism

B. Extinction

C. Commensalism

D. Parasitism

11. The diagram below represents a food web in an ecosystem.

If the population of hawks in this area increases, which of the following is correct about the effect that this increase may cause in this web?

A. The prey populations of hawks might decrease. Later the hawk population might remain unchanged.

B. The prey populations of hawks might decrease. Later, the hawk population might increase.

C. The prey populations of hawks might decrease, Later, the other populations in the web might decrease.

D. The prey populations of hawks might decrease. Later, the hawks would find another prey population.

12. All of the following could be considered density-dependent factors affecting population growth EXCEPT

A. Climate temperature

B. Limited nutrients

C. Build-up of toxins

D. Predation

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