Molecular Level Of Genetics Practice Quiz

50 Questions | By Joemollica | Updated: Nov 4, 2022 | Attempts: 3008

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Molecular Level Of Genetics Practice Quiz - Quiz

What do you know about genetics? This is a practice quiz for the molecular level of genetics. So, test and improve your genetics knowledge with the help of this quiz. Molecular genetics is a field of study that deals with the structure and function of genes, gametes, and sex cells at a molecular level. Do you know about Waston and Crick models? What are the X and Y chromosomes called? You will get all these answers once you play this quiz. Sounds cool? What are you waiting for? Give it a try.

Questions and Answers

1.

Waston and Crick built models that demonstrated that
- A.
  
  DNA and RNA have the same structure.
- B.
  
  DNA is made of two strands that twist into a double helix.
- C.
  
  Guanine forms hydrogen bonds with adenine.
- D.
  
  Thymine forms hydrogen bonds with cytosine.
2.

Molecules of DNA are composed of long chains of
- A.
  
  Amino acids.
- B.
  
  Fatty acids.
- C.
  
  Monosaccharides.
- D.
  
  Nucleotides.
3.

The entire molecule shown in the diagram is called a(n)
- A.
  
  Amino acids.
- B.
  
  Nucleotide.
- C.
  
  Polysaccharide.
- D.
  
  Pyrimidine.
4.

Cancer cells that spread are called
- A.
  
  Benign
- B.
  
  Malignant
- C.
  
  Somatic
- D.
  
  Gametic
5.

Using radioactive tracers (shown below) to determine the interactions of bacteriophages and their host bacteria, Hershey and Chase demonstrated without question that
- A.
  
  Genes are compose of protein molecules
- B.
  
  DNA and proteins are actually the same molecules located in different parts of the cells.
- C.
  
  Bacteria injects their DNA into the cytoplasm of bacteriophages.
- D.
  
  DNA is the molecule that stores genetic information in the cells.
6.

In humans, gametes contain
- A.
  
  22 autosomes and 1 sex chromosome.
- B.
  
  1 autosome and 22 sex chromosomess.
- C.
  
  45 autosome and 1 sex chromosome.
- D.
  
  1 autosome and 45 sex chromosomes.
7.

The X and Y chromosomes are called the
- A.
  
  Extra chromosomes.
- B.
  
  Phenotypes.
- C.
  
  Sex chromosomes.
- D.
  
  All of the above.
8.

Normal humans males develop from fertilized eggs containing which of the following sex chromosome combinations?
- A.
  
  XY
- B.
  
  XX
- C.
  
  XO
- D.
  
  OO
9.

Chromatids are
- A.
  
  Dense patches within the nucleus.
- B.
  
  Bacterial chromosomes.
- C.
  
  Joined strands of duplicated genetic material (chromosome)
- D.
  
  Prokaryotic nuclei.
10.

A strand of DNA has the following sequence of bases: ATC GTC TTC AAG What sequence of bases will make up the other strand of DNA?
- A.
  
  TAG CAG AAG TTC
- B.
  
  UUC AAG CAG UAG
- C.
  
  UAG CAG AAG UUC
- D.
  
  GTC ATC AAG TTC
11.

Griffith's transformation experiments shown below
- A.
  
  Changed proteins into DNA.
- B.
  
  Caused non-harmful bacteria to become deadly.
- C.
  
  Resulted in DNA molecules becoming proteins.
- D.
  
  Were design to show the effect of heat on bacteria.
12.

The point at which two chromatids are attached to each other in a chromosome is called a(n)
- A.
  
  Chloroplast.
- B.
  
  Centromere.
- C.
  
  Gamete.
- D.
  
  Centriole.
13.

The diploid number of chromosomes in a human skin cells is 46. The number of chromosomes found in a human ovum (egg) is
- A.
  
  46
- B.
  
  92
- C.
  
  23
- D.
  
  12.5
14.

At the very beginning of the translation, the first tRNA molecule
- A.
  
  Binds to the ribosome's A site.
- B.
  
  Attaches directly to the DNA codon.
- C.
  
  Connects an amino acid to its anticodon.
- D.
  
  Attaches to the P site of the ribosome.
15.

Using the DNA fingerprinting shown below, which suspect most likely matchs the sample taken from the crime scene
- A.
  
  Suspect A
- B.
  
  Suspect B
- C.
  
  No suspect matches the DNA fingerprint
16.

The non-coding portions of DNA that are separated from the portions of DNA actually used during transcription are called
- A.
  
  Mutons
- B.
  
  Exons
- C.
  
  Introns
- D.
  
  Exposons
17.

Many biologists believe that having the genes of eukaryotic cells interrupted by introns
- A.
  
  Prevents the code from being corrected.
- B.
  
  Ensured severely damaging mutations.
- C.
  
  Ensures that replication occurs correctly.
- D.
  
  Provides evolutionary flexibility.
18.

The lac operon is shut off when
- A.
  
  Lactose is present.
- B.
  
  Lactose is absent.
- C.
  
  Glucose is present.
- D.
  
  Glucose is absent.
19.

The portions of DNA molecules that actually code for the production of proteins are called
- A.
  
  Mutons
- B.
  
  Exons
- C.
  
  Introns
- D.
  
  Exposons
20.

Refer to the illustration below. Where on the lac operon does transcription take place?
- A.
  
  Promoter (p)
- B.
  
  Operator (o)
- C.
  
  Gene (z)
21.

The function of an operator is to?
- A.
  
  Regulate access of RNA polymerase to specific genes.
- B.
  
  Turn on and off the molecules of tRNA.
- C.
  
  Control the process of transcription within the nucleus.
- D.
  
  Generate amino acids for protein synthesis.
22.

Cells must control gene expression so that
- A.
  
  Their genes will only be expressed when needed.
- B.
  
  Their genes will always be expressed.
- C.
  
  Their genes will never be expressed.
- D.
  
  Genetic disorders can be corrected.
23.

A repressor protein
- A.
  
  Prevents DNA synthesis.
- B.
  
  Blocks movement of RNA polymerase.
- C.
  
  Attaches to ribosome during translation.
- D.
  
  Destroys amino acids before protein synthesis occurs.
24.

Refer to the illustration below. To which portion of the lac operon does the repressor bind?
- A.
  
  Promoter (p)
- B.
  
  Operator (o)
- C.
  
  Gene (z)
25.

The anticodons on the tRNA molecule for the codons in the mRNA: CUCAAGUCCUUC would be
- A.
  
  GAG--UUC--AGG--AAG.
- B.
  
  GAG--TTC--ACG--AAG.
- C.
  
  CUC--GAA--CGU--CUU.
- D.
  
  CUU--CGU--GAA--CUC.