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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
Embryology, epigenetics, prenatal development, etc.
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Teratogens affect the ____ more than any other part of the fetal body.
Teratogens affect the ____ more than any other part of the fetal body.
Teratogens affect the ____ more than any other part of the fetal body.
 
  a. central nervous system
   b. upper limbs
  c. heart
  d. lower limbs
 
   e. external genitalia
19zbell   78   1 Reply
6 years ago
Pattern baldness is a(n) ____ trait.
Pattern baldness is a(n) ____ trait.
Pattern baldness is a(n) ____ trait.
 
  a. X-linked
  b. Y-linked
  c. sex-linked
  d. sex-limited
 
   e. sex-influenced
19zbell   97   1 Reply
6 years ago
A polar body, once formed, has no further function and dies.
A polar body, once formed, has no further function and dies.
A polar body, once formed, has no further function and dies.
 
  a. True
   b. False
  Indicate whether the statement is true or false
19zbell   35   1 Reply
6 years ago
The 50S subunit has peptidyl transferase activity. What does this activity catalyze? What will be ...
The 50S subunit has peptidyl transferase activity. What does this activity catalyze? What will be ...
The 50S subunit has peptidyl transferase activity. What does this activity catalyze?
 
  What will be an ideal response?
19zbell   70   1 Reply
6 years ago
MRNAs that have stalled ribosomes in their coding regions are degraded by the process of
MRNAs that have stalled ribosomes in their coding regions are degraded by the process of
mRNAs that have stalled ribosomes in their coding regions are degraded by the process of
 
  a. nuclear surveillance.
  b. an miRNA decay pathway.
  c. nonsense-mediated decay (NMD).
  d. no-go decay (NGD).
  e. nonstop
19zbell   60   1 Reply
6 years ago
Which statement best describes the role of the E. coli RNA polymerase sigma factor?
Which statement best describes the role of the E. coli RNA polymerase sigma factor?
Which statement best describes the role of the E. coli RNA polymerase sigma factor?
 
  a. Sigma factor allows assembly of RNA polymerase.
  b. Sigma factor is responsible for catalyzing the formation of phosphodiester bonds during RN
19zbell   68   1 Reply
6 years ago
Describe the general process of excision repair.
Describe the general process of excision repair.
Describe the general process of excision repair.
 
  What will be an ideal response?
19zbell   50   1 Reply
6 years ago
What is nucleosome positioning?
What is nucleosome positioning?
What is nucleosome positioning?
 
  What will be an ideal response?
19zbell   41   1 Reply
6 years ago
Constitutive heterochromatin (Multiple Choice)
Constitutive heterochromatin (Multiple Choice)
Constitutive heterochromatin
 
  a. has a reduced frequency of recombination.
  b. contains regions of repetitive DNA.
  c. is permanently condensed.
  d. has a reduced density of genes.
  e. All of the above.
19zbell   83   1 Reply
6 years ago
Gene families can contain two members or hundreds of members. The duplicated copies can either ...
Gene families can contain two members or hundreds of members. The duplicated copies can either ...
Gene families can contain two members or hundreds of members. The duplicated copies can either remain tandemly associated or can be dispersed by recombination to different chromosomes.
 
  Give two examples of genes that are present in lar
19zbell   59   1 Reply
6 years ago
Xenopus laevis rDNA is (Multiple Choice)
Xenopus laevis rDNA is (Multiple Choice)
Xenopus laevis rDNA is
 
  a. repeated in sequences that are randomly distributed across the genome.
  b. arranged in clusters of repeats, but the spacers between repeats are unique.
  c. generally found in one unique sequence in
19zbell   58   1 Reply
6 years ago
In a plasmid vector, the purpose of the lacZ gene is
In a plasmid vector, the purpose of the lacZ gene is
In a plasmid vector, the purpose of the lacZ gene is
 
  a. to allow replication of the plasmid.
  b. to allow selection of transformed bacterial cells.
  c. to allow the plasmid to be cut once for cloning a fragment.
  d. t
19zbell   106   2 Replies
6 years ago
A chiasma is formed for what purpose?
A chiasma is formed for what purpose?
A chiasma is formed for what purpose?
 
  a. for nonhomologous recombination
  b. for genetic recombination
  c. to complete prophase II
  d. to repair double stranded breaks
  e. None of the above
19zbell   45   1 Reply
6 years ago
A protein is 300 amino acids long. Which of the following could be the number of nucleotides in the ...
A protein is 300 amino acids long. Which of the following could be the number of nucleotides in the ...
A protein is 300 amino acids long. Which of the following could be the number of nucleotides in the section of DNA that codes for this protein? (Remember: DNA is double-stranded.)
 
  A) 100 B) 1800 C) 300 D) 500 E) 3
19zbell   54   1 Reply
6 years ago
Below is a pedigree of a fairly common human hereditary trait; the boxes represent males and the ...
Below is a pedigree of a fairly common human hereditary trait; the boxes represent males and the ...
Below is a pedigree of a fairly common human hereditary trait; the boxes represent males and the circles represent females. Filled-in symbols indicate the abnormal phenotype.
 
  Given that one gene pair is involved,
 
  (a) Is
19zbell   88   1 Reply
6 years ago
Quantitative inheritance involves the interaction of a number of gene loci. The pattern of genetic ...
Quantitative inheritance involves the interaction of a number of gene loci. The pattern of genetic ...
Quantitative inheritance involves the interaction of a number of gene loci. The pattern of genetic transmission typical of quantitative inheritance is ________.
 
  A) continuous variation of phenotypic expression
  B) usually a patte
19zbell   101   1 Reply
6 years ago
Molecular/structural orientations (gradients) in an egg are thought to play a significant role in ...
Molecular/structural orientations (gradients) in an egg are thought to play a significant role in ...
Molecular/structural orientations (gradients) in an egg are thought to play a significant role in development. What is the origin of such gradients? What evidence indicates that the maternal genotype is involved in providing such gradients?
 
19zbell   60   1 Reply
6 years ago
In Drosophila, what is the order of function of the segmentation genes?
In Drosophila, what is the order of function of the segmentation genes?
In Drosophila, what is the order of function of the segmentation genes?
 
  What will be an ideal response?
19zbell   52   1 Reply
6 years ago
A restriction fragment is generated by the action of a restriction enzyme (endonuclease). ...
A restriction fragment is generated by the action of a restriction enzyme (endonuclease). ...
A restriction fragment is generated by the action of a restriction enzyme (endonuclease).
 
  Indicate whether the statement is true or false
19zbell   49   1 Reply
6 years ago
How many kinds of gametes will be expected from an individual with the genotype PpCcTTRr? What ...
How many kinds of gametes will be expected from an individual with the genotype PpCcTTRr? What ...
How many kinds of gametes will be expected from an individual with the genotype PpCcTTRr?
 
  What will be an ideal response?
19zbell   61   1 Reply
6 years ago
The discontinuous aspect of replication of DNA in vivo is caused by ________.
The discontinuous aspect of replication of DNA in vivo is caused by ________.
The discontinuous aspect of replication of DNA in vivo is caused by ________.
 
  A) the 5' to 3' polarity restriction
  B) polymerase slippage
  C) sister-chromatid exchanges
  D) trinucleotide repeats
  E) topoisomera
19zbell   45   1 Reply
6 years ago
What is another term for a biological catalyst?
What is another term for a biological catalyst?
What is another term for a biological catalyst?
 
  What will be an ideal response?
19zbell   38   1 Reply
6 years ago
What is a retrotransposon, and how does it differ from typical transposons?
What is a retrotransposon, and how does it differ from typical transposons?
What is a retrotransposon, and how does it differ from typical transposons?
 
  What will be an ideal response?
19zbell   28   1 Reply
6 years ago
In a theoretical population where f (A1 ) = 0.95 and f (A2 ) = 0.05, = 1 106, and v = 1 107, what ...
In a theoretical population where f (A1 ) = 0.95 and f (A2 ) = 0.05, = 1 106, and v = 1 107, what ...
In a theoretical population where f (A1 ) = 0.95 and f (A2 ) = 0.05,  = 1  106, and v = 1  107, what is q?
 
  What will be an ideal response?
19zbell   28   1 Reply
6 years ago
Which aspect of population genetics can lead to changes in allele frequencies in a new mixed ...
Which aspect of population genetics can lead to changes in allele frequencies in a new mixed ...
Which aspect of population genetics can lead to changes in allele frequencies in a new mixed population following migration?
 
  A) natural selection
  B) mutation
  C) gene flow
  D) founder effect
  E) bottleneck eff
19zbell   69   1 Reply
6 years ago
A transposon is : (Multiple Choice)
A transposon is : (Multiple Choice)
A transposon is
 
  A) a DNA segment that can insert itself at one or more sites in a genome.
  B) a jumping gene.
  C) a DNA segment that may cause mutations in genes or chromosomal rearrangements.
  D) a mobile genetic ele
19zbell   33   1 Reply
6 years ago
Would a two-letter code with four different nucleotides be sufficient to encode the 20 amino acids ...
Would a two-letter code with four different nucleotides be sufficient to encode the 20 amino acids ...
Would a two-letter code with four different nucleotides be sufficient to encode the 20 amino acids found in cells? Why or why not? What does the three-letter code imply about the nature of the genetic code?
 
  What will be an ideal respon
19zbell   38   1 Reply
6 years ago
What are the two sulfur-containing amino acids that contribute to a protein's tertiary structure? ...
What are the two sulfur-containing amino acids that contribute to a protein's tertiary structure? ...
What are the two sulfur-containing amino acids that contribute to a protein's tertiary structure?
 
  What will be an ideal response?
19zbell   30   1 Reply
6 years ago
Which enzyme cuts dsRNA into 21-25 bp fragments during RNAi?
Which enzyme cuts dsRNA into 21-25 bp fragments during RNAi?
Which enzyme cuts dsRNA into 21-25 bp fragments during RNAi?
 
  What will be an ideal response?
19zbell   40   1 Reply
6 years ago
What is the advantage of having a promoter sequence upstream of a coding sequence? What will be ...
What is the advantage of having a promoter sequence upstream of a coding sequence? What will be ...
What is the advantage of having a promoter sequence upstream of a coding sequence?
 
  What will be an ideal response?
19zbell   51   1 Reply
6 years ago
Which of the following will result in modifications to the expected Mendelian ratios?
Which of the following will result in modifications to the expected Mendelian ratios?
Which of the following will result in modifications to the expected Mendelian ratios?
 
  A) Epistasis
  B) Incomplete dominance
  C) Incomplete penetrance
  D) Gene interaction
  E) All of these
19zbell   55   1 Reply
6 years ago
The Rho protein is a topoisomerase that helps in untwisting the DNA template. (True or false?)
The Rho protein is a topoisomerase that helps in untwisting the DNA template. (True or false?)
The Rho protein is a topoisomerase that helps in untwisting the DNA template.
 
  Indicate whether the statement is true or false
19zbell   38   1 Reply
6 years ago
Nondisjunction is the failure of sex chromosomes to separate during gamete formation. (True or false?)
Nondisjunction is the failure of sex chromosomes to separate during gamete formation. (True or false?)
Nondisjunction is the failure of sex chromosomes to separate during gamete formation.
 
  Indicate whether the statement is true or false
19zbell   47   1 Reply
6 years ago
Transcriptionally active genes show lower levels of DNA methylation compared with transcriptionally ...
Transcriptionally active genes show lower levels of DNA methylation compared with transcriptionally ...
Transcriptionally active genes show lower levels of DNA methylation compared with transcriptionally inactive genes.
 
  Indicate whether the statement is true or false
19zbell   39   1 Reply
6 years ago
What is the role of cis-acting and trans-acting factors in transcription? Explain how these factors ...
What is the role of cis-acting and trans-acting factors in transcription? Explain how these factors ...
What is the role of cis-acting and trans-acting factors in transcription? Explain how these factors play a role in the lac operon, and discuss how complementation can be used to identify where the mutations have occurred (structural genes versus
19zbell   78   1 Reply
6 years ago
An individual who is a universal acceptor, meaning he or she will not have an adverse reaction to a ...
An individual who is a universal acceptor, meaning he or she will not have an adverse reaction to a ...
An individual who is a universal acceptor, meaning he or she will not have an adverse reaction to a transfusion with any type of blood, has which blood type?
 
  What will be an ideal response?
19zbell   29   1 Reply
6 years ago
True-breeding individuals are produced by repeated backcrossing. (True or false?)
True-breeding individuals are produced by repeated backcrossing. (True or false?)
True-breeding individuals are produced by repeated backcrossing.
 
  Indicate whether the statement is true or false
19zbell   27   1 Reply
6 years ago
A gene has acquired a mutation in which the protein product has an extra 50 amino acids at the end. ...
A gene has acquired a mutation in which the protein product has an extra 50 amino acids at the end. ...
A gene has acquired a mutation in which the protein product has an extra 50 amino acids at the end. Which region of the gene was likely mutated?
 
  A) coding region
  B) start codon
  C) promoter sequence
  D) terminator se
19zbell   58   1 Reply
kzeeb
6 years ago
Compare and contrast the two types of transposable elements found in bacteria. Provide examples of ...
Compare and contrast the two types of transposable elements found in bacteria. Provide examples of ...
Compare and contrast the two types of transposable elements found in bacteria. Provide examples of how transposable elements can be both harmful and beneficial to bacteria.
 
  What will be an ideal response?
19zbell   55   2 Replies
6 years ago
What distinguishes generalized versus specialized transduction?
What distinguishes generalized versus specialized transduction?
What distinguishes generalized versus specialized transduction?
 
  What will be an ideal response?
19zbell   60   1 Reply
6 years ago
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