1
Bio411 exam 4 Questions with Answers (100% Correct
Answers)
A protein on the cell surface that binds to a signaling molecule is an
example of which element of cellular communication? Answer: a
receptor protein
An increased heart rate caused by the release of adrenaline from the
adrenal glands, which are located just above the kidney, is an example
of _____ signaling. Answer: endocrine
Which type of cell signaling does not rely on the diffusion of a chemical
signal molecule? Answer: contact-dependent signaling
Which answer option correctly lists the types of cellular communication
from shortest to longest distance travelled by the signaling molecule to
reach its responding cell? Answer: autocrine, paracrine, endocrine
How are steroid hormone receptors and cell-surface receptors similar?
Answer: both types undergo a conformational change when they bind
to their ligand
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,2
What is the key difference between cell signaling by a cell-surface
receptor and cell signaling by an intracellular receptor? Answer: cell-
surface receptors bind polar signaling molecules; intracellular receptors
bind nonpolar signaling molecules
Why don't steroid hormones bind to transmembrane cell-surface
receptors? Answer: steroid hormones are nonpolar and therefore are
able to cross the cell's cell membrane, binding to receptors inside the
cell
The correct sequence of steps in the eukaryotic cell cycle is: Answer: G1
→ S phase → G2 → mitosis → cytokinesis
The correct sequence of steps in the M phase of the cell cycle: Answer:
prophase, prometaphase, metaphase, anaphase, telophase, cytokinesis
A skin cell in G2 of interphase has ____ as much DNA as it had in G1
Answer: twice
Prokaryotic cells and eukaryotic cells reproduce by cell division.
Regardless of the type of cell, all cells must ___ before they divide.
Answer: make an exact copy of their genetic information
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, 3
Which processes produce different proteins in different cells from the
same primary transcript? (2 of them) Answer: alternative splicing, RNA
editing
For the lac operon, lactose is a(n): Answer: inducer
Which answer choice describes an event that takes place during gene
regulation at the level of the chromosome? Answer: chromosome is
remodeled and nucleosomes are repositioned, thereby making specific
regions of the DNA available for transcription
Methylation, acetylation, and other histone modifications are important
because they are associated with: Answer: chromatin remodeling and
thereby- affect gene expression
The human body contains approximately 200 major cell types. They
look and function differently from one another because each: Answer:
expresses a different set of genes
Many genes have multiple enhancer sequences. The multiple enhancer
sequences allow multiple: Answer: transcription factors to control gene
expression
© 2025 All rights reserved
Bio411 exam 4 Questions with Answers (100% Correct
Answers)
A protein on the cell surface that binds to a signaling molecule is an
example of which element of cellular communication? Answer: a
receptor protein
An increased heart rate caused by the release of adrenaline from the
adrenal glands, which are located just above the kidney, is an example
of _____ signaling. Answer: endocrine
Which type of cell signaling does not rely on the diffusion of a chemical
signal molecule? Answer: contact-dependent signaling
Which answer option correctly lists the types of cellular communication
from shortest to longest distance travelled by the signaling molecule to
reach its responding cell? Answer: autocrine, paracrine, endocrine
How are steroid hormone receptors and cell-surface receptors similar?
Answer: both types undergo a conformational change when they bind
to their ligand
© 2025 All rights reserved
,2
What is the key difference between cell signaling by a cell-surface
receptor and cell signaling by an intracellular receptor? Answer: cell-
surface receptors bind polar signaling molecules; intracellular receptors
bind nonpolar signaling molecules
Why don't steroid hormones bind to transmembrane cell-surface
receptors? Answer: steroid hormones are nonpolar and therefore are
able to cross the cell's cell membrane, binding to receptors inside the
cell
The correct sequence of steps in the eukaryotic cell cycle is: Answer: G1
→ S phase → G2 → mitosis → cytokinesis
The correct sequence of steps in the M phase of the cell cycle: Answer:
prophase, prometaphase, metaphase, anaphase, telophase, cytokinesis
A skin cell in G2 of interphase has ____ as much DNA as it had in G1
Answer: twice
Prokaryotic cells and eukaryotic cells reproduce by cell division.
Regardless of the type of cell, all cells must ___ before they divide.
Answer: make an exact copy of their genetic information
© 2025 All rights reserved
, 3
Which processes produce different proteins in different cells from the
same primary transcript? (2 of them) Answer: alternative splicing, RNA
editing
For the lac operon, lactose is a(n): Answer: inducer
Which answer choice describes an event that takes place during gene
regulation at the level of the chromosome? Answer: chromosome is
remodeled and nucleosomes are repositioned, thereby making specific
regions of the DNA available for transcription
Methylation, acetylation, and other histone modifications are important
because they are associated with: Answer: chromatin remodeling and
thereby- affect gene expression
The human body contains approximately 200 major cell types. They
look and function differently from one another because each: Answer:
expresses a different set of genes
Many genes have multiple enhancer sequences. The multiple enhancer
sequences allow multiple: Answer: transcription factors to control gene
expression
© 2025 All rights reserved
