Molecular Biology Questions
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The peptide bond is formed between which two chemical groups of the amino acid?
Which chemical groups on amino acids are charged at neutral pH?
The linear sequence of peptide chains are always read from the ______?
The pufferfish, Fugu rubripes, has a genome that is one-tenth the size of mammalian genomes. Which of the following statements is not a possible reasonfor this size difference?(a) Intron sequences in Fugu are shorter than those in mammals.(b) Fugu lacks the repetitive DNA found in mammals.(c) The Fugu genome seems to have lost sequences faster than it has gained sequences over evolutionary time.(d) Fugu has lost many genes that are part of gene families.
a lipid molecule with a characteristic four-ring steroid structure that is an important component of the plasma membrane of animal cells is called?
Which statement about a human neuron and a human lymphocyte is FALSE:(a) they express different RNAs and proteins(b) they have two completely different genomes (c) they are functionally very different (d) they are structurally very different
Operons _______?______(a) are commonly found in eukaryotic cells(b) are transcribed by RNA polymerase II(c) contain a cluster of genes transcribed as a single mRNA(d) can only regulated by gene activator proteins
what is TRUE about the lac operon?(a) the CAP is bound when there are excess glucose and lactose (b) Lac operon turns on when the CAP is bound, even if the lac repressor is bound(c) Lac operon is on when there is excess lactose and glucose levels are very low(d) a low lactose level allows for the binding on CAP protein(e) lactose levels have no effect on the lac operon
The tryptophan operator site _____?(a) is an allosteric protein(b) binds to the tryptophan repressor when the tryptophan repressor is bound to tryptophan(c) is required for production of the mRNA encoded by the tryptophan operon(d) is important for the production of the tryptophan repressor
which of the following functions do you NOT expect to find in the set of genes in all life forms on earth?(a) DNA replication(b) DNA repair (c) protein production(d) RNA splicing
genes and genomes can be altered by several different mechanisms such as:gene duplicationgene deletionexon shufflingmutation with a geneall of the above
an artificial phospholipid bilayer vesicle formed from an aqueous suspension of phospholipid molecules is call a/an
Which of the following codons is NOT for stop codon?UAAUAGUGAAUG
Which about Lac operon is FALSE?(a) the Lac repressor binds to the lac operator when lactose is present in the cell(b) even when the CAP activator is bound to DNA, if lactose is not present, the Lac operon will not be transcribed(c) the CAP activator can only bind DNA when it is bound to cAMP(d) the lac operon only produces RNA when lactose is present, and glucose is absent
a molecule having both hydrophilic and hydrophobic regions, as in a phospholipid or detergent molecules is called ?
You isolate a pathogenic strain of E. coli from a patient and discover that this E.coli strain is resistant to an antibiotic. Common laboratory strains of E. coli arenot resistant to this antibiotic, nor are any other previously isolated pathogenic E.coli strains. However, such resistance has been observed in other bacteria in thehospital in which the patient was treated. This newly discovered antibioticresistance in E. coli is most likely due to _______.(a) a mutation within a gene.(b) a mutation within the regulatory DNA of a gene.(c) gene duplication.(d) horizontal gene transfer.
all are true EXCEPT:(a) gene duplication occurs by equal crossing-over between short repeated sequences on heterogenous segments of DNA(b) DNA duplications give rise to families of related genes within a single cell (c) a single-chain globin molecule gave rise to the different hemoglobin molecules used by humans and other mammals(d) new genes come into existence by gene duplication and accumulation of mutations within them
Which amino acid will be on the tRNA that is the first to bind to the P site on the small subunit of ribosome to start translation? (a) methionine(b) arginine(c) cysteine(d) valine
which is FALSE?(a) a mutation that arises in a mothers somatic cell often causes a disease in her daughter(b) all mutations occurring in an asexually reproducing single-celled organism are passed on to its progeny(c) in an evolutionary sense, somatic cells exist only to help propagate germ-line cells(d) a mutation is passed on to offspring only if it is present in the germ-line
The following mechanisms/molecules involved in RNA splicing, EXCEPT:(a) 5'-2' link of branch point Adenine(b) small nuclear ribonucleoproteins(c) formation of lariat structures from excised introns(d) Exon sequences are removed by ribozymes