The molecular basis of inheritance

17 important questions on The molecular basis of inheritance

What are bacteriophages (or phages)?

viruses that infect bacteria.

What is the technique X-ray crystallography?

a technique for studying molecular structure (maurice wilkins and Rosalind Franklin).

What suggested the X-ray crystallography photo?

that the DNA molecule was made up of two strands, froming a double  helix.
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

Where does a DNA strand consist of?

phophate (phosphate backbone), sugar (deoxyribose) and a nitrogenous base (CTGA).

Where does a purine consist of?

Adenine en Guanine

Where does a pyrimidine consist of?

Cytosine, Thymine en Uracil

What is a replication frok and what is the function?

it is a Y-shaped region where new DNA strands are elongating. it is at the end of each replication bubble.

What does the enzym Helicase?

utwist the double helix at the replication forks.

What does a single-strand binding protein?

bind to and stabilize single-stranded DNA.

What does DNA polymerase?

catalyze the elongation of a new DNA at a replication fork.
mostly it requires a primer and a DNA template strand.
add nucleotides to the 3' end.

What does the enzyme primase?

it can start an RNA chain from scratch and adds RNA nucleotides one at a time using the parental DNA as a template.

What is a leading strand?

the new complementary DNA strand synthesized continously along the template strand toward the replication fork in the mandatory 5' --> 3' direction.

What is a lagging strand?

a discontinuously synthesized DNA strand that elongates by means of okazaki fragments, each synthesized in a 5' --> 3' direction away form the replication fork.

What does DNA ligase?

a linkage enzyme essential for DNA replication; catalyzed the covalent bonding of the 3' end of one DNA fragment (such as a okazaki fragment) to the 5' end of another DNA fragment (such as growing DNA Chain).

What is a telomeres?

special nucleotide sequences at the end of DNA molecules.

What is the function of a telomeres?

• they do not prevent the shortening of DNA molecules, but they do postpone the erosion of genes near the ends of DNA molecules
•It has been proposed that the shortening of telomeres is connected to aging

What is a histone?

a small protein with a high proportion of positively charged amino acids that binds to the negatively charged DNA and plays a key role in chromatin structure.

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo