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HESI A2/BIOLOGY/PRACTICE QUESTIONS EXAM
QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -99 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: What is the function of tRNA during DNA transcription?
tRNA bonds together amino acids and then releases them to create an elongated chain of amino acids.B tRNA contains codons during DNA transcription.C tRNA is the piece of DNA produced during transcription.tRNA brings the amino acids to the site of synthesis.
Answer:
tRNA brings the amino acids to the site of synthesis.Question 2: The method by which mRNA is created is begun by which of the following processes?Replication Translation Splitting Transcription
Answer:
Transcription is the first step in the creation of mRNA from a strand of DNA.
Question 3: Which of the following activities does NOT lead to cellular energy production?Glycolysis.Gluconeogenesis.Oxidative Phosphorylation.Cellular Respiration.
Answer:
Gluconeogenesis Cellular respiration leads to glycolysis while Oxidative Phosphorylation (a type of cellular respiration), and both create energy by catabolism. Gluconeogenesis is the creation of sugar using energy.
Question 4: Which adaptation differentiates mammals
from other animals?
- regulation of body temperature
- terrestrial mobility
- specialized communication
- mammary glands functional in mothers
with offspring
Answer:
- Mammals are differentiated from other
animals by their mammary glands, which females use to nurse their young. Birds can also regulate their body temperatue, so that is not the correct answer.Question 5: It is known that the gene that codes for male pattern baldness depends on the gene
for red hair. This type of interaction between alleles is known as:
Interplay.B Affectation.C Genotype.D Epistasis
Answer:
Epistasis is the interaction between two alleles which have different effects in combination than individually.
Question 6: The term pleiotropy is best defined as: A condition in which multiple genes are missing.A situation in which one gene remains unexpressed.One gene influencing multiple, seemingly unrelated phenotypic traits.Two genes affected by a single allele.
Answer:
One gene influencing multiple, seemingly unrelated phenotypic traits.Pleiotropy describes conditions where one gene has multiple effects on phenotypic traits. The prefix pleio- means "many," or "more," and -tropy means "way."
Question 7: Which of the following is not a nitrogenous base found in DNA?
Thymine Uracil Adenine Guanine
Answer:
Uracil
Question 8: Which organ system is responsible for
producing white blood cells in humans?
- skeletal
- immune
- circulatory
- integumentary
Answer:
- Marrow produces red and white blood cells
and platelets and is located in the bones of the skeletal system.Question 9: Glycolysis is the conversion of _______ to ______ in the process of cellular respiration.Glucose, pyruvate.B Pyruvate, glucose.C NADH, pyruvate.
D NADH, ATP
Answer:
Gluclose, pyruvate
Glycolysis is the conversion of glucose to pyruvate and is the first step in the process of cellular respiration.
Question 10: Which of the following is NOT characteristic
of anaphylaxis?
- circulatory shock
- bronchospasm
- hives
- hypertension
Answer:
- Anaphylaxis is an immune system response
such as that which occurs in a person who gets stung by a bee and is allergic to the venom. Hypertension is another term for high blood pressure and is not a common characteristic of anaphylaxis.
Question 11: In which phase of the cell cycle is DNA replicated?
G1 S G2 D1
Answer:
The G1, S, and G2 phases are called interphase. S phase is when DNA is replicated. (G1 = growth phase, G2 = second growth phase and preparation for division). There is no such thing as the D1 phase.Question 12: For every glucose molecule utilized during cellular respiration, approximately how many ATP molecules can be produced?14 to 18.B 18 to 25.C 32 to 36.D 68 to 70
Answer:
Cellular respiration can generate from 32 to 36 molecules of ATP for every single glucose molecule broken down. The number of ATP is described as a range because the reaction is not perfect and will sometimes yield more or less ATP.
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