NEX Science Version 2
Practice exam for Nursing Entrance Exam (NEX) under Pre-Nursing (Nursing Exams). 5 sample questions.
Sample Questions
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Question 1
The inherited factors that are transmitted in an organism from generation to generation are called its
Correct Answer: C
Rationale: The genotype refers to the genetic makeup of an organism, specifically the alleles it possesses, which are passed from generation to generation. The phenotype (A) is the observable expression of the genotype, influenced by the environment. Heterozygote (B) and homozygote (D) describe specific allele combinations (different or same alleles, respectively) but are not the general term for inherited factors.
Rationale: The genotype refers to the genetic makeup of an organism, specifically the alleles it possesses, which are passed from generation to generation. The phenotype (A) is the observable expression of the genotype, influenced by the environment. Heterozygote (B) and homozygote (D) describe specific allele combinations (different or same alleles, respectively) but are not the general term for inherited factors.
Question 2
A cell which manufactures a large amount of protein for export would have an abundance of organelles called
Correct Answer: B
Rationale: Ribosomes are the organelles responsible for protein synthesis. Cells that produce large amounts of protein for export, such as secretory cells, have an abundance of ribosomes, often associated with the rough endoplasmic reticulum. Peroxisomes (A) break down fatty acids and detoxify substances, lysosomes (C) degrade waste, and centrioles (D) are involved in cell division, not protein synthesis.
Rationale: Ribosomes are the organelles responsible for protein synthesis. Cells that produce large amounts of protein for export, such as secretory cells, have an abundance of ribosomes, often associated with the rough endoplasmic reticulum. Peroxisomes (A) break down fatty acids and detoxify substances, lysosomes (C) degrade waste, and centrioles (D) are involved in cell division, not protein synthesis.
Question 3
Which of the following molecules is an electrolyte normally found in the blood?
Correct Answer: B
Rationale: An electrolyte is a substance that dissociates into ions in solution, contributing to electrical conductivity. Calcium ions (Ca2+) are electrolytes found in blood, critical for processes like muscle contraction and nerve signaling. H2O (A) is not an electrolyte as it does not dissociate into ions. Lactase (C) is an enzyme, and iodine (D) is a non-electrolyte element in its molecular form.
Rationale: An electrolyte is a substance that dissociates into ions in solution, contributing to electrical conductivity. Calcium ions (Ca2+) are electrolytes found in blood, critical for processes like muscle contraction and nerve signaling. H2O (A) is not an electrolyte as it does not dissociate into ions. Lactase (C) is an enzyme, and iodine (D) is a non-electrolyte element in its molecular form.
Question 4
During translation, the cell produces proteins by using information from
Correct Answer: C
Rationale: Translation is the process where the cell synthesizes proteins using the genetic code carried by messenger RNA (mRNA). mRNA provides the template with codons that specify amino acids. siRNA (A) is involved in gene silencing, tRNA (B) delivers amino acids, and rRNA (D) is a component of ribosomes, but only mRNA directly provides the protein-coding information.
Rationale: Translation is the process where the cell synthesizes proteins using the genetic code carried by messenger RNA (mRNA). mRNA provides the template with codons that specify amino acids. siRNA (A) is involved in gene silencing, tRNA (B) delivers amino acids, and rRNA (D) is a component of ribosomes, but only mRNA directly provides the protein-coding information.
Question 5
The process by which needed nutrients enter the bloodstream of an animal is called
Correct Answer: D
Rationale: Absorption is the process by which nutrients from digested food pass through the digestive tract into the bloodstream for distribution. Integration (A) is not a biological term in this context, osmosis (B) refers to water movement across membranes, and assimilation (C) involves incorporating nutrients into cellular processes after absorption.
Rationale: Absorption is the process by which nutrients from digested food pass through the digestive tract into the bloodstream for distribution. Integration (A) is not a biological term in this context, osmosis (B) refers to water movement across membranes, and assimilation (C) involves incorporating nutrients into cellular processes after absorption.