Pre & Post Lab Quizzes Flashcards
What is the smallest unit of heredity?
gene
DNA replication is semiconservative process because the ________ strand will remain as half of the ________ molecule.
template, final DNA
Which of the following is the amino acid that appears at the N-terminus of all newly translated prokaryotic and eukaryotic polypeptides?
methionine
If 30% of the bases within a DNA molecule are adenine, what is the percentage of thymine?
30%
Ribosomes are composed of rRNA and what other component?
protein
Which of the following types of RNA codes for a protein?
mRNA
In DNA, adenine is the complementary base for ________ ,and cytosine is the complement for ________
thymine, guanine
According to the central dogma, which of the following represents the flow of genetic information in cells?
DNA to RNA to protein
Which of the following is absent in eukaryotes, but present in prokaryotes?
simultaneous transcription and translation
Serratia marcescens cells produce a red pigment at room temperature. The red color of the colonies is an example of which of the following?
phenotype
Which of the following components is involved in the initiation of transcription?
promoter
Which of the following correctly explains why DNA replication is described as semiconservative?
Each daughter strand contains one old strand and one new strand.
DNA polymerase catalyzes the synthesis of DNA in the
5’ to 3’ direction
A DNA nucleotide contains which of the following?
a deoxyribose sugar, a phosphate, and a nitrogenous base
Which of the following is not a difference between DNA and RNA?
DNA is used for shorter-term functions than RNA.
The Shine-Dalgarno sequence is
a short sequence that acts as a ribosomal binding site
Which of the following correctly describes the number and type of bond(s) that stabilize an adenine–thymine base pair?
two hydrogen bonds
Evidence that DNA was the genetic material rather than protein was provided by which of the following?
Hershey and Chase
The final step in gene expression is protein synthesis, or
translation
One strand of DNA runs from 5′ to 3′ and the opposing strand runs 3′ to 5′, meaning that the strands are oriented in which way?
antiparallel
The enzyme that catalyzes the synthesis of DNA is called
DNA polymerase
Which of the following is the function of the σ factor?
It allows RNA polymerase to recognize a specific promoter in prokaryotes.
The chromosome of almost all bacteria is in the shape of
a closed circle
The concept of chemical evolution is based on
the possible origin of life by the combination of chemicals under suitable environmental conditions
