Cell Biology/Cell Biochemistry: Exam #2
Choose the single best answer
Which base is not present in RNA?
An RNA molecule can fold into complex three-dimensional shapes because:
Cell Biology/Cell Biochemistry: Exam #1
Choose the single best answer.
1) Living systems are incredibly diverse in size, shape, environment, and behavior. It is estimated
that there are between 10 million and 100 million different species. Despite this wi
Cell Biology/Cell Biochemistry: Final Exam
Choose the single best answer.
Which of the following organelles has both an outer and an inner membrane?
Transposable Elements and
Transposon = transposable element: jumping gene, a DNA
sequence able to insert itself at a new location (mobile) simple
translocation or generation of a new copy.
There is a hierarchy of organization in the general
structure of chromatin in all eukaryotes.
Nucleosome: DNA+histone, forms 10 nm fiber
30 nm fiber: the coiling of the 10 nm fiber into a
transcription factor (DNA-binding or proteinbinding)protein required for transcription initiation but not
part of RNA polymerase.
basal transcription factors (e.g., TFIIH) transcription
Bacteria cells are circular to prevent the ends from being attacked. Linear ones (oval) will be attacked at
Chromosomes makes loops called chromosomal domains which are accessible.
4 Which of the following statements is FALSE about regulation of trp operon?
a. The rate of ribosome movement determines secondary structure of the RNA at the
b. Transcription elongation continues when the level of Trp-tRNA is high.
c. If the
10. James Watson & Francis Crick proposed the DNA double-helix model b 1953. W was
the form they proposed? is the site at which the aim m
a of the individual clim- a. It is dened by DNA sequences.
b. The length of DNA for centromeric function is usually
The Replicon: Initiation of Replication
Replicon: a unit of the genome in which DNA is replicated.
Each contains an origin for initiation of replication.
Origin of replication: a sequence of DNA at which
RNA Splicing and Processing
Figure 21.01: RNA is modied in the
nucleus by addi=ons to the 5' and 3' ends
and by splicing to remove the introns.
Eukaryotic genes are
composed of introns and
CELL BIOLOGY- Chapter 20
Cell wall- boxes that enclose, protect, and constrain the shape of each cell.
o First make a primary cell wall that can expand and accommodate cell growth. The driving force for growth is
turgor pressure, a swelling pressure that
You scored 64 out of 70
Your answer is CORRECT.
Which of the following is NOT one of Dr Reas 5 Essential Characteristics of All Cells?
Capable of protein synthesis
Capable of autonomous replication
Capable of r
Molecular Biology Review I
DNA consists of two strands
o Top strand: coding/sense strand
Reads from 5 to 3
o Bottom strand: template/antisense strand
Reads from 3 to 5
o Via RNA synthesis forms RNA strand that is same as DNA coding strand,
Using the Genetic Code
Sixty-one of the
20 amino acids.
do not represent
amino acids and
vThere are multiple control points for gene
activation of gene structure
on chromatin (histone
initiation of transcription and
Structure is evolutionarily conserved, yet overall size and
Ribosomes are ribonucleoprotein particles.
rRNA is the major component by the mas
Cellular genetic material (genome): DNA or RNA
They must be condensed to be packaged into phages, viruses,
bacteria, or eukaryotic nuclei.
Genome condensation results from its binding to basic proteins
A unit of bacterial gene expression and regulation
There are various stages at which expression of a gene can be
regulated. The most common is transcription initiation.
Structural genes code for RNAs or
Histone tails can be covalently modified
Replicons and the origin of replication
Replication: a key regulatory
event in cell division
Every time a cell divides, the
entire set of DNA must