HESI A2 CHEMISTRY PART 3 EXAM QUESTIONS

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HESI A2 CHEMISTRY PART 3 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -50 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: RNA

Answer:

ribonucleic acid one single stranded polynucleotide chain adenine-uracil guanine-cytosine is one of the three major biological macromolecules that are essential for all organisms along with DNA and proteins. When the cell needs to produce a certain protein , it activates the protein's gene and produces multiple copies of that piece of DNA in the form of messenger RNA or mRNA. The multiple copies of mRNA are then used to translate the genetic code into protein through the ribosomes . Thus, RNA expands the quantity of a given protein that can be made at one time from one given gene, and it provides an important control point for regulating when and how much protein gets made.RNA contains ribose instead.Ribose has a hydroxyl group attached to the pentose ring in the 2? position, whereas deoxyribose does not. The hydroxyl groups in

the ribose backbone make RNA less stable than DNA because it is more prone to hydrolysis .

Question 2: Codon

Answer:

is a sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis and the full set of codons is called the genetic code .TAG, TAA, and TGA .

Question 3: Genotype

Answer:

is the combination of alleles present in an organism. For a person's eye color, the genotype may consist of two alleles for dark eyes (homozygous dominant), two alleles for light eyes (homozygous recessive), or one of each alleles (heterozygous). The genotype determines the phenotype.DD = homozygous dominant = dark eyes Dd = heterozygous = dark eyes dd = homozygous recessive = light eyes

Question 4: Steps of Mitosis

Answer:

prophase, metaphase, anaphase, telophase

Question 5: Mitosis

Answer:

form of asexual reproduction that takes place only in eukaryotic cells . In mitosis,

the parent cell undergoes several phases and divides into two identical cells that are called daughter cells. somatic cells Repair, growth, development 46 chromosomes

Question 6: Gene

Answer:

Hereditary unit of a cell

• Present on a Chromosome

Question 7: oxygen for photosynthesis

Answer:

Photosynthesis is represented by;

6CO2 + 6H2O ? C6H12O6 + 6O2

During photosynthesis , energy from the sun is used to produce glucose and oxygen from carbon dioxide and water .Water and carbon dioxide are the reactants in photosynthesis , not the products.

Question 8: Interphase

Answer:

interphase is the longest part of the cell cycle . This is when the cell grows and copies its DNA before moving into mitosis.

Question 9: Telophase

Answer:

In telophase , the cell is nearly done dividing , and it starts to re-establish its normal structures as cytokinesis (a division of the cell contents) takes place. Two nuclei are formed, nuclear membrane reforms, and chromosomes decondense.

Question 10: Prometaphase

Answer:

pindle fibers begin to attach to and organize the chromosomes.

Question 11: dna

Answer:

nucleic acid is a long molecule that contains our unique genetic code . It holds the instructions for making all the proteins in our bodies. DNA is a double helical structure that contains the four nitrogenous bases

: adenine, thymine, guanine, and cytosine. Each base forms

hydrogen bonds with another base on the complementary strand. The bases have a precise bonding pattern. Adenine bonds with thymine and guanine bonds with cytosine (remember: AT/GC). Because of this method of bonding, the strands can be replicated, producing identical strands of DNA.While the sugar-phosphate "backbone" of DNA contains deoxyribose ,