Molecular Biology (Chapter 1-5, 20-23)

122 Questions | By Ekanye | Updated: Mar 22, 2022 | Attempts: 558

Questions

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These are the powerpoint questions he asked I'll add some randoms one later when I get through reading all the chapters. Good luck.

Questions and Answers

1.

Some genes located on the same chromosome do not show perfect linkage because?
- A.
  
  They are too close together
- B.
  
  The are interrupted by other genes
- C.
  
  Crossover events occur between homologous genes
- D.
  
  Some genes are deleted
- E.
  
  Too many alleles are present
2.

During an experiment with drosophilia, it was discovered that all females had red eyes. A conclusing based on this observation would be?
- A.
  
  The gene for eye color is located on the X chromosome
- B.
  
  The eye color phenotype is sex-linked
- C.
  
  The females are homozygotes
- D.
  
  The gene for eye color is located on an autosome
- E.
  
  Both (A) and (B) are correct
3.

Which of the following statements is not true regarding genetic mapping?
- A.
  
  Genes are arragned in a linear order on chromosomes
- B.
  
  Recombination occurs between chromosomes
- C.
  
  There is a mathematical relationship between the distance separtating two genes and the recombination frequency
- D.
  
  Mapping is used to establish the location of genes relative to each other
- E.
  
  Mapping is used to determine the composition of a gene.
4.

Evidence that physical recombination occurs between two chromosomes was provided by?
- A.
  
  McClintock and Creighton
- B.
  
  Watson and Crick
- C.
  
  Avery, McLeod and McCarthy
- D.
  
  Hershey and Chase
- E.
  
  Miescher and Morgan
5.

The chromosomal theory of inheritance holds that
- A.
  
  Chromosomes vary in size
- B.
  
  The number of chromosomes vary in individuals
- C.
  
  Chromosomes contain histone protiens
- D.
  
  Genes are arranged in a linear order on chromosomes
- E.
  
  Chromosomes condense during mitosis
6.

Which of the following was demonstrated by Frederick and Griffiths?
- A.
  
  Nuclein was the possible genetic material
- B.
  
  A genetic trait can be transferred from one organism to another
- C.
  
  Genes are linked
- D.
  
  Corssing over occurs between chromosomes
- E.
  
  Protein is a major component of nuclein.
7.

Who first conducted the X-ray diffraction studies of DNA?
- A.
  
  Franklin and Wilkins
- B.
  
  Miescher and McClintock
- C.
  
  Wason and Crick
- D.
  
  Meselson and Stahl
- E.
  
  Avery and Beadle
8.

Which of the follwing scientists provided definitive evidence for the chromosomal theory?
- A.
  
  Mendel
- B.
  
  Morgan
- C.
  
  McClintock
- D.
  
  Miescher
- E.
  
  Avery
9.

The relationship between genes and enzymes was shown by?
- A.
  
  Watson and Crick
- B.
  
  Beadle and Tatum
- C.
  
  Avery and McLeod
- D.
  
  Morgan and Mendel
- E.
  
  Miescher and Stern
10.

The notion of one-gene/one-enzyme is true or not? If not, it is because of which of the following?
- A.
  
  An enzyme can be composed of more than one polypeptide
- B.
  
  Many genes contain the information for making polypeptides that are not enzymes.
- C.
  
  The end products of some genes are not polypeptides
- D.
  
  All A-C are correct
- E.
  
  Only A and B are correct
11.

Which of the following is not a product of transcription?
- A.
  
  RNA
- B.
  
  DNA
- C.
  
  RRNA
- D.
  
  TRNA
- E.
  
  MRNA
12.

Which of the following is true about wild-type organisms?
- A.
  
  They are always foudn in the wild.
- B.
  
  They are free of all mutations.
- C.
  
  They are also referred to as standard-types
- D.
  
  They carry no recessive genes.
- E.
  
  None of the choices
13.

The correct structure of DNA components can be presented as
- A.
  
  Phosphate–base–sugar
- B.
  
  Phosphate-sugar-base
- C.
  
  Base-phosphate-sugar
- D.
  
  Phosphate-sugar-phosphate-base
- E.
  
  Base-sugar-phosphate-base
14.

Which of the following is a characteristic of double-stranded DNA?
- A.
  
  2 nanometers in width
- B.
  
  10 base pairs per turn
- C.
  
  0.34 nanometers per basepair
- D.
  
  A and B
- E.
  
  A, B and C
15.

Which of the following DNA molecules is the most stable?
- A.
  
  CTGCATAC GACGTATG
- B.
  
  GAAATTTC CTTTAAAG
- C.
  
  AGTCGAAT TCAGCTTA
- D.
  
  GCGTGCAC CGCACGTG
- E.
  
  GGATCCTG CCTAGGAC
16.

Double-stranded DNA consists of two antiparallel strands, meaning that one strand is oriented in the 5' to 3' direction, while the other is oriented in the 3' to 5' direction.
- A.
  
  True
- B.
  
  False
17.

Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves.
- A.
  
  True
- B.
  
  False
18.

In experiments conducted by Griffitsh, the inabilityy of the avirulent strain to produce a lethal infection was due to
- A.
  
  The presence of a protective
- B.
  
  Destruction by the host's white blood cells
- C.
  
  The presence of a gene for a polysaccharide coat
- D.
  
  The high body temperature of the host
- E.
  
  None of the choices are correct
19.

Experiments conducted by Frederick Griffiths laid the foundation for?
- A.
  
  Elucidation of mRNA structure
- B.
  
  DNA as the genetic material
- C.
  
  The virulence of S. pneumoniae
- D.
  
  The discovery of the capsule of S. pneumoniae
- E.
  
  Elucidaiton of tRNA structure.
20.

Which of the following would be the substance of choice to destroy the DNA in a solution?
- A.
  
  Ribonuclease
- B.
  
  Trypson
- C.
  
  Chymotrypsin
- D.
  
  Deoxyribonuclease
- E.
  
  None of the choices are correct
21.

The analytic tools used to show that DNA was the transforming substance include all of the following except
- A.
  
  Ultracentrifugation
- B.
  
  Electrophoresis
- C.
  
  UV absorption spectrophotometry
- D.
  
  Heat inactivation
- E.
  
  Chemical analysis
22.

All of the following are found in RNA except
- A.
  
  Adenine
- B.
  
  Deoxyribose
- C.
  
  Cytosine
- D.
  
  Guanine
- E.
  
  Uracil
23.

Which of the following is not found in RNA and DNA?
- A.
  
  Nitrogen
- B.
  
  Oxygen
- C.
  
  Carbon
- D.
  
  Sulfur
- E.
  
  Hydrogen
24.

The bonds that connect adenine to thymine in a DNA double helix are
- A.
  
  Ionic
- B.
  
  Hydrophobic
- C.
  
  Hydrogen
- D.
  
  Covalent
- E.
  
  One of the choices are correct
25.

Phosphodiester bonds are examples of
- A.
  
  Hydrophobic interactions
- B.
  
  Hydrogen bonds
- C.
  
  Convalent bonds
- D.
  
  Noncovalent bonds
- E.
  
  Ionic bonds