Among the microorganisms, various genomes can include chromosomes. plasmids. mitochondrial DNA. chloroplast DNA. All of the choices are correct.
All of the choices are correct
Eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have histone proteins. chromosomes in a nucleus. several to many chromosomes. elongated, not circular, chromosomes. All of the choices are correct.
All of the choices are correct.
The DNA of microorganisms is made up of subunits called histones. amino acids. nucleotides. mRNA. polymerases.
Which is incorrect about purines?
only found in DNA, not in RNA are nitrogenous bases always paired with a specific pyrimidine include adenine and guanine found within nucleotides
only found in DNA, not in RNA
5. The antiparallel arrangement within DNA molecules refers to each base bonding at the 1' position of the sugar. a purine always bonding to a pyrimidine. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule. None of the choices are correct.
one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.
6. The duplication of a cell's DNA is called mitosis. replication. transcription. translation. mutation.
7. The enzymes that help pack DNA into the cell by coiling the DNA into a tight bundle are DNA ligases. DNA polymerases. DNA helicases. DNA gyrases. primases.
8. The enzymes that can proofread replicating DNA, detect incorrect bases, excise them, and correctly replace them are DNA ligases. DNA polymerases. DNA helicases. DNA gyrases. primases.
9. All of the following pertain to nitrogenous bases except they form pairs by hydrogen bonding. guanine pairs with uracil. adenine pairs with thymine. cytosine and thymine are pyrimidines. allows variation from one nucleotide to another which creates the encoded information
guanine pairs with uracil.
10. Groups of three consecutive bases along the DNA of a gene have the code for one protein. nucleotide. amino acid. purine. None of the choices are correct.
11. The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called ribosomal RNA. messenger RNA. transfer RNA. primer RNA. ribozymes.
12. This molecule is transcribed from the DNA template strand and later translated. ribosomal RNA messenger RNA transfer RNA primer RNA protein
13. RNA molecules differ from DNA molecules because only RNA has ribose. has uracil. is typically one strand of nucleotides. does not have thymine. All of the choices are correct.
All of the choices are correct
14. All of the following pertain to transcription except it occurs on a ribosome in the cytoplasm. occurs before translation. requires RNA polymerase. requires a template DNA strand. is part of the process of protein synthesis.
occurs on a ribosome in the cytoplasm
15. If a codon for alanine is GCA, then the anticodon is GCA. CGT. ACG. CGU. UGC.
16. The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the promoter. operator. operon. exon. intron.
17. A sequence of bases on a gene that does not code for protein is called a/an promoter. operator. operon. exon. intron.
18. Which is incorrect about inducible operons? they have genes turned off by a buildup of end product they are often for catabolic pathways they are normally turned off they are turned on by the substrate of the enzyme they include the lac operon
they have genes turned off by a buildup of end product
19. The operon segment composed of the gene that codes for a protein repressor is called the operator. structural locus. regulator. promoter. None of the choices are correct.
20. Synthesis of an inducible enzyme requires repressor alone bound to operator. substrate bound to repressor. substrate bound to promoter. corepressor and repressor binding to the operator. None of the choices are correct.
substrate bound to repressor
21. Bacterial conjugation involves bacteriophage carrying donor DNA to the recipient cell. a donor cell with a plasmid and a pilus. naked DNA fragments from a lysed donor cell are taken up by a recipient cell. new progeny cells with genes from two parent bacterial cells. None of the choices are correc
a donor cell with a plasmid and a pilus.
22. Which is incorrect about pyrimidines? are only found in DNA, not in RNA they are always paired with a specific purine they include cytosine and thymine they are found within nucleotides they are nitrogenous bases they
are only found in DNA, not in RNA
23. Which type of mutation leads to a frameshift mutation? missense deletion nonsense base substitution All of the choices are correct.
24. Individuals with xeroderma pigmentosa lack a functioning photolyase. DNA polymerase III. DNA ligase. ribozyme. RNA polymerase.
25. All of the following are products of transcription except rRNA. mRNA. DNA. tRNA. All of the choices are products of transcription
26. If the DNA sequence is ATTCCGGA, the mRNA transcript would be TAAGGCCT. UAAGGCCU. ATTCCGGA. GUUAATTG. CAAGGUTA.
27. All of the following are true about mutations except they are always detrimental to the organism they occur in. they occur in the DNA. if not repaired, they become part of the gene pool. they may lead to an incorrect protein being made. they can create variants in a population.
they are always detrimental to the organism they occur in.
28. Individuals with xeroderma pigmentosa cannot repair mutations caused by nitrous acid. acridine dyes. ultraviolet light. ethidium bromide. bisulfite.
29. Which of the following is not true about transposons? They contain DNA that codes for their own removal and insertion. They can move from a chromosome to another chromosome. They can move from a chromosome to a plasmid. They are rare among prokaryotic and eukaryotic cells. They can replicate themselves before jumping to the next location
They are rare among prokaryotic and eukaryotic cells.
30. A missense mutation can cause no significant alteration in protein functions. True False
: 31. Transduction utilizes bacteriophages to carry DNA from a donor cell to a recipient cell. True False
32. The smallest unit of heredity is a chromosome. True False
33. The on/off switch for transcription in the lactose operon is called the regulator. True False
34. Lactose is a corepressor in the lac operon. True False
35. Induced mutations result from errors in DNA replication. True False
36. DNA photolyase, in the presence of visible light, can repair DNA damage due to ultraviolet radiation. True False
37. The _____ is all of the genetic material of a cell.
38. Each nucleotide is composed of one phosphate, one 5-carbon _____, and one _____ base.
Base pairs in DNA are held together by _____ bonds
: 40. During replication, each parent DNA strand serves as a _____ for synthesis of new DNA strands
Each _____ is a specific segment of the DNA with the code for production of one functional product.
Gene regulation can involve a protein repressor that blocks _____ from initiating transcription
: 43. A permanent, inheritable change in the genetic information is called a _____.