Chapter 10 Flashcards
Streptococcus mutans only expresses the genes for slime-layer production when what occurs?
sucrose is present
Who suggested that the DNA molecule may have three strands?
Linus Pauling
Which alga provided an important model to demonstrate the location of genetic information in the nucleus?
Acetabularia
DNA strands are often denatured in the laboratory using which method?
raising the temperature
Which of the following correctly describes the number and type of bond(s) that stabilize an adenine–thymine base pair?
two hydrogen bonds
The rejoining of two previously separated strands of DNA is called?
reannealing
Who identified the nucleotide bases of DNA and RNA?
Albrecht Kossel
What describes a stable change in gene expression without changing the base sequence?
epigenetics
Which enzymes help prevent supercoiling?
topoisomerases
Transmission of genetic information from parent to offspring is called which of the following?
vertical gene transfer
In which cellular location in a eukaryote do rRNA synthesis and ribosome assembly occur?
in the nucleolus
A DNA nucleotide contains which of the following?
a deoxyribose sugar, a phosphate, and a nitrogenous base
When Mendel published his work, most people believed what about inheritance?
Blending of traits from both parents produces the traits of the offspring.
What best describes true-breeding organisms?
They produce offspring identical to themselves when self-fertilized.
Who first demonstrated horizontal transmission of genetic information?
Frederick Griffith
