Biochemistry

Nitrogen fixation requires the hydrolysis of 8 ATPs to produce 2 NH3 molecules from 1 N2.T/F?

Nitrogen fixation requires the hydrolysis of 8 ATPs to produce 2 NH3 molecules from 1 N2.T/F?

Nitrogen fixation requires the hydrolysis of 8 ATPs to produce 2 NH3 molecules from 1 N2.
T/F?

3493954   90   1 Reply

Nyntti

The proteasome is a large multisubunit ATP-dependent protease that degrades proteins that have been ...

The proteasome is a large multisubunit ATP-dependent protease that degrades proteins that have been ...

The proteasome is a large multisubunit ATP-dependent protease that degrades proteins that have been modified by the attachment of ________.

3493954   60   1 Reply

Nyntti

Pyridoxal phosphate is a versatile coenzyme as it is capable of forming a stable ________ base ...

Pyridoxal phosphate is a versatile coenzyme as it is capable of forming a stable ________ base ...

Pyridoxal phosphate is a versatile coenzyme as it is capable of forming a stable ________ base between an amino acid substrate and the coenzyme.

3493954   89   1 Reply

BurgaskO

Tetrahydrofolate is a coenzyme involved in the mobilization and utilization of single carbon ...

Tetrahydrofolate is a coenzyme involved in the mobilization and utilization of single carbon ...

Tetrahydrofolate is a coenzyme involved in the mobilization and utilization of single carbon functional units in the:
A) metabolism of serine, glycine, methionine, and histidine.
B) biosynthesis of purine nucleotides.
C) biosynthesis o

3493954   124   1 Reply

BurgaskO

Transamination reactions can be used to degrade or synthesize amino acids because they have an ...

Transamination reactions can be used to degrade or synthesize amino acids because they have an ...

Transamination reactions can be used to degrade or synthesize amino acids because they have an ________ that has a value close to one.

3493954   76   1 Reply

Nyntti

With appropriate nutrition, animals maintain nitrogen intake and excretion at equivalent rates.T/F?

With appropriate nutrition, animals maintain nitrogen intake and excretion at equivalent rates.T/F?

With appropriate nutrition, animals maintain nitrogen intake and excretion at equivalent rates.
T/F?

3493954   93   1 Reply

BurgaskO

The Krebs-Henseleit urea cycle takes place in liver cells entirely within the mitochondrion.T/F?

The Krebs-Henseleit urea cycle takes place in liver cells entirely within the mitochondrion.T/F?

The Krebs-Henseleit urea cycle takes place in liver cells entirely within the mitochondrion.
T/F?

3493954   69   1 Reply

Nyntti

Which of the following amino acids is both glucogenic and ketogenic?

Which of the following amino acids is both glucogenic and ketogenic?

Which of the following amino acids is both glucogenic and ketogenic?
A) Lysine
B) Leucine
C) Tryptophan
D) Cysteine
E) Arginine

3493954   84   1 Reply

BurgaskO

The H2S produced by metabolism of cysteine is a waste product with no physiological or biochemical ...

The H2S produced by metabolism of cysteine is a waste product with no physiological or biochemical ...

The H2S produced by metabolism of cysteine is a waste product with no physiological or biochemical function.
T/F?

3493954   72   1 Reply

BurgaskO

Arginine and methionine can be synthesized by mammals but are generally classed as essential amino ...

Arginine and methionine can be synthesized by mammals but are generally classed as essential amino ...

Arginine and methionine can be synthesized by mammals but are generally classed as essential amino acids.
T/F?

3493954   92   1 Reply

Nyntti

Folate deficiency results in increased risk of cardiovascular disease associated with abnormally ...

Folate deficiency results in increased risk of cardiovascular disease associated with abnormally ...

Folate deficiency results in increased risk of cardiovascular disease associated with abnormally high levels of serum ________ due to decreased levels of tetrahydrofolate cofactors required for the methionine synthase reaction.

3493954   74   1 Reply

Nyntti

Tyrosine is the precursor of serotonin which has a number of roles in the nervous system.T/F?

Tyrosine is the precursor of serotonin which has a number of roles in the nervous system.T/F?

Tyrosine is the precursor of serotonin which has a number of roles in the nervous system.
T/F?

3493954   62   1 Reply

BurgaskO

Which of the following enzymes is NOT primarily used in salvage of nucleic acids because the ...

Which of the following enzymes is NOT primarily used in salvage of nucleic acids because the ...

Which of the following enzymes is NOT primarily used in salvage of nucleic acids because the pyrophosphate product is rapidly hydrolyzed?
A) Endonuclease
B) Phosphodiesterase
C) Nucleotidase
D) Phosphoribosyltransferase
E) No

3493954   70   1 Reply

Nyntti

Which of the following compounds is NOT a precursor for nucleotide biosynthesis?

Which of the following compounds is NOT a precursor for nucleotide biosynthesis?

Which of the following compounds is NOT a precursor for nucleotide biosynthesis?
A) Aspartate
B) Glutamine
C) Glycine
D) Fumarate
E) Carbamoyl phosphate

3493954   75   1 Reply

Nyntti

Which of the following statements about purine biosynthesis in vertebrates is FALSE?

Which of the following statements about purine biosynthesis in vertebrates is FALSE?

Which of the following statements about purine biosynthesis in vertebrates is FALSE?
A) Many of the proteins are multifunctional in that they have more than one active site.
B) Six proteins form a multienzyme complex with covalent linkages.

3493954   151   1 Reply

Nyntti

The initial end products of purine nucleotide biosynthesis are monophosphates.T/F?

The initial end products of purine nucleotide biosynthesis are monophosphates.T/F?

The initial end products of purine nucleotide biosynthesis are monophosphates.
T/F?

3493954   72   1 Reply

BurgaskO

Inosine 5'-monophosphate, which contains the base hypoxanthine, is a common intermediate for ...

Inosine 5'-monophosphate, which contains the base hypoxanthine, is a common intermediate for ...

Inosine 5'-monophosphate, which contains the base hypoxanthine, is a common intermediate for ________ nucleotide biosynthesis.

3493954   79   1 Reply

BurgaskO

The end product of purine catabolism in humans is:

The end product of purine catabolism in humans is:

The end product of purine catabolism in humans is:
A) xanthine.
B) uric acid.
C) allantoin.
D) urea.
E) hypoxanthine.

3493954   80   1 Reply

Nyntti

Humans and great apes do not make the enzyme urate oxidase and are hence prone to gout from the ...

Humans and great apes do not make the enzyme urate oxidase and are hence prone to gout from the ...

Humans and great apes do not make the enzyme urate oxidase and are hence prone to gout from the crystallization of ________ in synovial fluid of joints.

3493954   80   1 Reply

BurgaskO

While purines are assembled as nucleotides early in their biosynthetic pathway, the pyrimidine ring ...

While purines are assembled as nucleotides early in their biosynthetic pathway, the pyrimidine ring ...

While purines are assembled as nucleotides early in their biosynthetic pathway, the pyrimidine ring is assembled as a ________.

3493954   81   1 Reply

BurgaskO

Glutamine amidotransferases require ATP hydrolysis to make the ________ of glutamine ...

Glutamine amidotransferases require ATP hydrolysis to make the ________ of glutamine ...

Glutamine amidotransferases require ATP hydrolysis to make the ________ of glutamine biosynthetically active.

3493954   208   1 Reply

Nyntti

Which statement about nucleotides is FALSE?

Which statement about nucleotides is FALSE?

Which statement about nucleotides is FALSE?
A) Most cells contain 5 to 10 times more RNA than DNA.
B) Ribonucleotides have a number of different metabolic roles.
C) The only role of deoxyribonucleotides is as constituents of DNA.

3493954   103   1 Reply

BurgaskO

All of the dNTPs are produced in approximately the same amounts because the first step in each ...

All of the dNTPs are produced in approximately the same amounts because the first step in each ...

All of the dNTPs are produced in approximately the same amounts because the first step in each pathway is catalyzed by the same ribonucleotide reductase enzyme.
T/F?

3493954   96   1 Reply

Nyntti

Which of the following is an extracellular messenger involved in signal transduction?

Which of the following is an extracellular messenger involved in signal transduction?

Which of the following is an extracellular messenger involved in signal transduction?
A) Cyclic GMP
B) Ca2+
C) Epinephrine
D) Rhodopsin
E) Diacylglycerol

3493954   74   1 Reply

Nyntti

Which of the following compounds can act as second messengers in signal transduction pathways?

Which of the following compounds can act as second messengers in signal transduction pathways?

Which of the following compounds can act as second messengers in signal transduction pathways?
A) Cyclic AMP
B) Phospholipase C
C) Adenylate cyclase
D) Phosphotidylinositol 4,5-bisphosphate
E) Both A and D

3493954   138   1 Reply

BurgaskO

G proteins are membrane-bound proteins that bind GDP when inactive.T/F?

G proteins are membrane-bound proteins that bind GDP when inactive.T/F?

G proteins are membrane-bound proteins that bind GDP when inactive.
T/F?

3493954   155   1 Reply

Nyntti

Which of the following does NOT belong to a receptor tyrosine kinase family?

Which of the following does NOT belong to a receptor tyrosine kinase family?

Which of the following does NOT belong to a receptor tyrosine kinase family?
A) Platelet-derived growth factor receptor
B) Insulin receptor
C) Fibroblast growth factor receptor
D) Thyroid receptor
E) Epidermal growth factor r

3493954   79   1 Reply

BurgaskO

Receptor tyrosine kinases are membrane-spanning proteins with an intrinsic tyrosine kinase domain on ...

Receptor tyrosine kinases are membrane-spanning proteins with an intrinsic tyrosine kinase domain on ...

Receptor tyrosine kinases are membrane-spanning proteins with an intrinsic tyrosine kinase domain on the extracellular side of the membrane.
T/F?

3493954   137   1 Reply

BurgaskO

The end result of a signal transduction pathway is often a change in gene expression.T/F?

The end result of a signal transduction pathway is often a change in gene expression.T/F?

The end result of a signal transduction pathway is often a change in gene expression.
T/F?

3493954   123   1 Reply

BurgaskO

Name the amino acid residue that is used to complex zinc ions in the zinc finger motif of steroid ...

Name the amino acid residue that is used to complex zinc ions in the zinc finger motif of steroid ...

Name the amino acid residue that is used to complex zinc ions in the zinc finger motif of steroid receptors.

3493954   80   1 Reply

BurgaskO

The drug tamoxifen can be used as an anti-cancer drug in some breast tumors as it binds to the ...

The drug tamoxifen can be used as an anti-cancer drug in some breast tumors as it binds to the ...

The drug tamoxifen can be used as an anti-cancer drug in some breast tumors as it binds to the ________ but does not activate estrogen-responsive genes.

3493954   59   1 Reply

BurgaskO

Steroid hormones are cytosolic ligands for a class of nuclear receptors that exert their effects by ...

Steroid hormones are cytosolic ligands for a class of nuclear receptors that exert their effects by ...

Steroid hormones are cytosolic ligands for a class of nuclear receptors that exert their effects by binding to specific sites on ________.

3493954   91   1 Reply

Nyntti

Most synaptic transmission events are mediated electrically through gap junctions between cells.T/F?

Most synaptic transmission events are mediated electrically through gap junctions between cells.T/F?

Most synaptic transmission events are mediated electrically through gap junctions between cells.
T/F?

3493954   74   1 Reply

BurgaskO

Heterochromatin is transcriptionally active.T/F?

Heterochromatin is transcriptionally active.T/F?

Heterochromatin is transcriptionally active.
T/F?

3493954   57   1 Reply

Nyntti

The linker histone H1 has a high proportion of the following amino acid residue.

The linker histone H1 has a high proportion of the following amino acid residue.

The linker histone H1 has a high proportion of the following amino acid residue.
A) Leucine
B) Lysine
C) Isoleucine
D) Asparagine
E) Histidine

3493954   86   1 Reply

Nyntti

The post-translational modifications of histone proteins have functional roles in gene ...

The post-translational modifications of histone proteins have functional roles in gene ...

The post-translational modifications of histone proteins have functional roles in gene expression.
T/F?

3493954   112   1 Reply

BurgaskO

The repeating unit of chromatin is known as the ________.

The repeating unit of chromatin is known as the ________.

The repeating unit of chromatin is known as the ________.

3493954   76   1 Reply

Nyntti

If 10.4 bp of DNA represents a linear length of 3.4 nm, how long (in meters) would one copy of the ...

If 10.4 bp of DNA represents a linear length of 3.4 nm, how long (in meters) would one copy of the ...

If 10.4 bp of DNA represents a linear length of 3.4 nm, how long (in meters) would one copy of the human genome (~3 × 109 bp) be if all of the DNA was placed end to end in a linear fashion?

3493954   76   1 Reply

BurgaskO

Random variations among human genome sequences can result in gain or loss of ________ endonuclease ...

Random variations among human genome sequences can result in gain or loss of ________ endonuclease ...

Random variations among human genome sequences can result in gain or loss of ________ endonuclease cleavage sites.

3493954   71   1 Reply

Nyntti

Both type I or type II topoisomerases carry out their catalytic activity via a covalent ...

Both type I or type II topoisomerases carry out their catalytic activity via a covalent ...

Both type I or type II topoisomerases carry out their catalytic activity via a covalent phosphodiester intermediate between a phosphate group on the DNA and a tyrosine hydroxyl group on the enzyme.
T/F?

3493954   41   1 Reply

BurgaskO