BIO 116 Exam 1 Questions and
Answers
The level of structure of a protein described as alpha helices or beta sheets is
a) primary structure
b) secondary structure
c) tertiary structure
d) quaternary structure - ANSWER-B: secondary structure
Suppose a young boy suffers from a metabolic disease that causes chronic fatigue.
Which of the following organelles is most likely malfunctioning in his cells?
a)lysosomes
b)Golgi apparatus
c)mitochondria
d)smooth endoplasmic reticulum - ANSWER-C: mitochondria
Which of the following structures form cytoplasmic channels that connect-adjacent
plant cells through the cell walls?
a)desmosomes
b)gap junctions
c)plasmodesmata
d)tight junctions - ANSWER-C: plasmodesmata
A solution with a pH of 2 has how many more protons in it than a solution with a pH
of 4?
a)2 times more
b)10 times more
c)100 times more
d)1000 times more - ANSWER-C: 100 times more
Whatkinds of molecules pass through a cell membrane mosteasily?
a)large and hydrophobic
b)small and hydrophobic
c)large polar
d)small and ionic - ANSWER-B: small and hydrophobic
A covalent bond is likely to be polar when ________.
a)one of the atoms sharing electrons is more electronegative than the other atom
b)the two atoms sharing electrons are equally electronegative
, c)carbon is one of the two atoms sharing electrons
d)the two atoms sharing electrons are of the same elements - ANSWER-A: one of
the atoms sharing electrons is more electronegative than the other atom
Which two functional groups are always found in amino acids?
a)carbonyl and amino groups
b)carboxyl and amino groups
c)amino and sulfhydryl groups
d)hydroxyl and carboxyl groups - ANSWER-B: carboxyl and amino groups
DNAs are polymers made of __________.
a)amino acids
b)ribose
c)deoxyribose
d)nucleotides
e)nucleosides - ANSWER-D: nucleotides
Based on Figure 1, which of these experimental treatments would increase the rate
of sucrose transportinto a plant cell?
https://gyazo.com/22f5ec1689aa9a40418f7075b5444eb2
a)decreasing extracellular sucrose concentration
b)decreasing extracellular pH
c)increasing extracellular pH
d)adding a substance that makes the membrane more permeable to hydrogen ions -
ANSWER-B: decreasing extracellular pH
The second messenger in the following signaling pathway is ________.
epinephrine →G protein-coupled receptor →G protein →adenylyl cyclase →cAMP
a)cAMP
b)G protein
c)adenylyl cyclase
d)G protein-coupled receptor - ANSWER-A: cAMP
The receptors for steroid hormones are located inside the cell instead of the
membrane surface like most other signal receptors. How do steroids gain access to
their receptors?
a)Steroid hormones are lipid soluble, so they can readily diffuse through the lipid
bilayer of the cell membrane.
b)Steroid hormone receptors undergo conformational changes that relocate them on
the membrane surface.
c)Both steroid hormones and their receptors are produced by the same cells.
d)Steroid hormones first bind to a steroid activator and this complex is transported
across the cell membrane by a steroid transport protein. - ANSWER-A: Steroid
Answers
The level of structure of a protein described as alpha helices or beta sheets is
a) primary structure
b) secondary structure
c) tertiary structure
d) quaternary structure - ANSWER-B: secondary structure
Suppose a young boy suffers from a metabolic disease that causes chronic fatigue.
Which of the following organelles is most likely malfunctioning in his cells?
a)lysosomes
b)Golgi apparatus
c)mitochondria
d)smooth endoplasmic reticulum - ANSWER-C: mitochondria
Which of the following structures form cytoplasmic channels that connect-adjacent
plant cells through the cell walls?
a)desmosomes
b)gap junctions
c)plasmodesmata
d)tight junctions - ANSWER-C: plasmodesmata
A solution with a pH of 2 has how many more protons in it than a solution with a pH
of 4?
a)2 times more
b)10 times more
c)100 times more
d)1000 times more - ANSWER-C: 100 times more
Whatkinds of molecules pass through a cell membrane mosteasily?
a)large and hydrophobic
b)small and hydrophobic
c)large polar
d)small and ionic - ANSWER-B: small and hydrophobic
A covalent bond is likely to be polar when ________.
a)one of the atoms sharing electrons is more electronegative than the other atom
b)the two atoms sharing electrons are equally electronegative
, c)carbon is one of the two atoms sharing electrons
d)the two atoms sharing electrons are of the same elements - ANSWER-A: one of
the atoms sharing electrons is more electronegative than the other atom
Which two functional groups are always found in amino acids?
a)carbonyl and amino groups
b)carboxyl and amino groups
c)amino and sulfhydryl groups
d)hydroxyl and carboxyl groups - ANSWER-B: carboxyl and amino groups
DNAs are polymers made of __________.
a)amino acids
b)ribose
c)deoxyribose
d)nucleotides
e)nucleosides - ANSWER-D: nucleotides
Based on Figure 1, which of these experimental treatments would increase the rate
of sucrose transportinto a plant cell?
https://gyazo.com/22f5ec1689aa9a40418f7075b5444eb2
a)decreasing extracellular sucrose concentration
b)decreasing extracellular pH
c)increasing extracellular pH
d)adding a substance that makes the membrane more permeable to hydrogen ions -
ANSWER-B: decreasing extracellular pH
The second messenger in the following signaling pathway is ________.
epinephrine →G protein-coupled receptor →G protein →adenylyl cyclase →cAMP
a)cAMP
b)G protein
c)adenylyl cyclase
d)G protein-coupled receptor - ANSWER-A: cAMP
The receptors for steroid hormones are located inside the cell instead of the
membrane surface like most other signal receptors. How do steroids gain access to
their receptors?
a)Steroid hormones are lipid soluble, so they can readily diffuse through the lipid
bilayer of the cell membrane.
b)Steroid hormone receptors undergo conformational changes that relocate them on
the membrane surface.
c)Both steroid hormones and their receptors are produced by the same cells.
d)Steroid hormones first bind to a steroid activator and this complex is transported
across the cell membrane by a steroid transport protein. - ANSWER-A: Steroid
