Biology-1Practice Exam Three

1.The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called

  1. asexual reproduction.
  2. sexual reproduction.
  3. regeneration.
  4. spontaneous generation.

2.The need for cells to be in contact with a solid surface to divide is called,

  1. growth factor desensitization
  2. anchorage dependence
  3. cell constraint
  4. density-dependent inhibition
  5. cell division repression

3.Chromatin is

  1. composed of DNA and protein
  2. found in the cytoplasm of a cell
  3. composed of microfilaments and actin filaments and are part of the cytoskeleton
  4. found in the cytoplasm of the cell anchoring organelles
  5. none of the above

4.Which of the following statements about human somatic cells is true?

  1. has 23 homologous pairs
  2. has a total of 46 chromosomes
  3. has 2 sex chromosomes
  4. is diploid
  5. all of the above are true

5.Which of the following statements is false?

  1. Gametes are sex cells like sperm and egg
  2. Somatic cells are diploid.
  3. Gametes are made by meiosis
  4. A zygote is a fertilized egg
  5. A human zygote is haploid

6.Homologous chromosomes:

  1. are genetically identical
  2. are similar in length
  3. carry information for the same inherited traits
  4. are formed during DNA replication
  5. b and c are correct

7.Both mitosis and meiosis are preceded by

  1. prometaphase.
  2. interphase.
  3. prophase.
  4. telophase.
  5. cytokinesis

8.During which stage of meiosis are homologous chromosomes separated?

  1. interphase I b. anaphase I c. metaphase I d. interphase II e. anaphase II

9.The centrosome is a region in which

  1. the nucleus is located prior to mitosis
  2. new spindle microtubules form
  3. sister chromatids are attached to one another
  4. centrioles are located
  5. chromosomes are grouped during telophase

10.What is a sister chromatid?

  1. a chromosome found outside the nucleus
  2. a special region that holds two centromeres together
  3. another name for the chromosomes found in genetics
  4. a chromosome in G1 of the cell cycle
  5. a replicated chromosome

11.During which phase of the cell cycle would you expect to see chromosomes for the first time in the cell cycle?

  1. metaphaseb. prophasec. telophase d. anaphasee. interphase

12.During which phase of mitosis does the nuclear envelope re-form?

  1. anaphase
  2. metaphase
  3. prophase
  4. telophase
  5. none of the above

13.Which of the following variations of the sentence "Where is the cat?" is most like a chromosomal deletion?

  1. Where is cat?
  2. Where is the the cat?
  3. Where the is cat?
  4. Where is cat the the cat?

14.Which of the following statements regarding genetic diversity is false?

  1. Genetic diversity increases due to random fertilization.
  2. Genetic diversity increases due to independent orientation of chromosomes at metaphase I.
  3. Genetic diversity increases by mitosis.
  4. Genetic diversity increases by crossing over during meiosis.
  5. Genetic diversity increases by recombination

15.A cell that has a cell wall is undergoing cell division, and the following events are observed: the formation of a cell plate and the division of the cell into two daughter cells. What type of cell is being observed and what process(es) is it going through?

  1. prokaryote; telophase of mitosis
  2. animal cell; telophase and cytokinesis of mitosis
  3. plant cell; telophase and cytokinesis of mitosis
  4. plant cell; telophase II of meiosis

16.All the offspring of a cross between a red-flowered plant and a white-flowered plant have pink flowers. This means that the allele for red flowers is ______to the allele for white flowers.

  1. dominant
  2. codominant
  3. incompletely dominant
  4. recessive

17.All the offspring of a cross between a purple flower and a white flower have purpleflowers. This means that the allele for purple flower color is ______the allele for white flowers.

  1. codominant to
  2. incompletely dominant to
  3. recessive to
  4. more aggressive than
  5. dominant to

18.Which of the following statements is false?

  1. Incomplete dominance supports the blending hypothesis.
  2. The four blood types result from various combinations of the three different ABO alleles.
  3. ABO blood groups can provide evidence of paternity.
  4. The impact of a single gene on more than one character is called pleiotropy.

19.The alleles of a gene are found at ______chromosomes.

  1. the same locus on non-homologous
  2. different loci on homologous
  3. different loci on non-homologous
  4. the same locus on homologous
  5. none of the above

20.If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb × AaBb?

  1. 16:0:0:0b. 8:4:2:2c.1:1:1:1d.9:3:3:1

21.Which of the following is essentially the opposite of pleiotropy?

  1. incomplete dominance
  2. codominance
  3. multiple alleles
  4. polygenic inheritance

22.Any gene located on a sex chromosome

  1. is called a recessive gene
  2. is called a sex-linked gene
  3. will exhibit pleiotropy
  4. will exhibit codominance
  5. is recessive

23.What is the normal makeup of sex chromosomes in a human female?

  1. two X chromosomes
  2. two Y chromosomes
  3. two X chromosomes and one Y chromosome
  4. one X chromosome and one Y chromosome
  5. one Y chromosome

24.A testcross is

  1. a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.
  2. a mating between an individual of unknown genotype and an individual heterozygous for the trait of interest.
  3. a mating between two individuals heterozygous for the trait of interest.
  4. a mating between two individuals of unknown genotype.
  5. none of the above

25.Monomers of DNA and RNA are

  1. amino acids
  2. monosaccharides
  3. nucleotides
  4. fatty acids.
  5. nucleic acids

26.Which of the following statements regarding RNA is false?

  1. RNA uses the sugar dextrose.
  2. RNA uses the nitrogenous base uracil.
  3. One RNA molecule can include four different nucleotides in its structure.
  4. RNA molecules have a sugar-phosphate backbone.

27.Which of the following is true concerning the 3 prime end of one strand of the DNA double helix?

  1. The 3 prime carbon is attached to a hydroxyl group
  2. The 3 prime carbon is attached to a phosphate group
  3. During DNA replication, neither strand grows from the 3 prime end
  4. The 3 prime end of one strand is next to (across from) the 3 prime end of the other strand
  5. None of the above are true

28. DNA replication

  1. occurs through the addition of nucleotides to the5 prime end of the DNA molecule.
  2. results in the formation of four new DNA strands.
  3. only involves copying half of the DNA
  4. begins when two DNA molecules join together to exchange segments.
  5. none of the above

29.Which enzyme is correctly paired with its function?

  1. DNA polymerase- transcription
  2. RNA polymerase-transcription
  3. DNA ligase-translation
  4. Helicase-linking fragmented DNA

30.The lagging strand which is formed during DNA replication

  1. grows from the 5 prime end
  2. is synthesized continuously
  3. is synthesized in Okazaki fragments
  4. is synthesized toward the replication fork
  5. none of the above

31.When one DNA molecule is copied to make two DNA molecules, each new DNA contains

  1. none of the parent DNA
  2. 25% of the parent DNA
  3. 50% of the parent DNA
  4. 75% of the parent DNA
  5. 100% of the parent DNA

32.How many replication forks exist in two origins of replication?

  1. 2 replication forks
  2. 4 replication forks
  3. 6 replication forks
  4. 8 replication forks
  5. 12 replication forks

33.The genetic material is duplicated during

  1. the mitotic phase
  2. G1
  3. the S phase
  4. G2
  5. cytokinesis

34.Which of the following options best depicts the flow of information when a gene directs the synthesis of a cellular component?

  1. RNA → DNA → RNA → protein
  2. DNA → RNA → protein
  3. protein → RNA → DNA
  4. DNA → tRNA → mRNA → protein

35.Where does translation occur in eukaryotic cells?

  1. on the plasma membrane
  2. in the nucleus
  3. in the cytoplasm
  4. in vesicles
  5. none of the above

36.A ______is a smaller segment of DNA that carries the instructions for the synthesis of one polypeptide.

  1. genomeb. intronc. locusd. genee. triplet

37.Genetic information for a polypeptide chain is written in the mRNA as ______.

  1. codonsb. anticodonsc. triplets d. four letter wordse. introns

38.Which of the following statements about RNA polymerase is TRUE?

  1. RNA polymerase adds complementary RNA nucleotides during transcription
  2. RNA polymerase is not involved in transcription
  3. RNA polymerase is responsible for translation
  4. RNA polymerase is used only in DNA replication
  5. None of the above

39.Which of the following is not transcribeddirectly from DNA?

  1. protein b. exons c. intronsd. mRNAe. tRNA

40.Which of the following occurs when RNA polymerase attaches to the promoter in DNA?

  1. elongation of the growing RNA molecule
  2. termination of the RNA molecule
  3. initiation of a new RNA molecule
  4. initiation of a new polypeptide chain
  5. none of the above

41.What are the non-coding segments of a stretch of eukaryotic DNA called?

  1. intronsb. exonsc. codonsd. repliconse. transposons

42.Transcription

  1. copies the base sequence in DNA to a complementary sequence of RNA
  2. uses DNA as a template
  3. is the synthesis of rRNA, mRNA and tRNA
  4. takes place in the nucleus
  5. is all of the above

43.In eukaryotes, transcription is terminated when

  1. the ribosome reaches a stop codon in the mRNA
  2. DNA polymerase transcribes a terminator sequence
  3. RNA polymerase transcribes a terminator sequence
  4. a cap and tail are added to mRNA
  5. none of the above

44.The A-site on the ribosomal unit is the site where

  1. mRNA binds
  2. the tRNA molecule exits the ribosome
  3. a tRNA with new amino acid binds
  4. helicase unwinds the DNA helix
  5. none of the above

45.The fact that GAA and GAG both code for glutamic acid demonstrates______in the genetic code.

  1. redundancyd. no ambiguity
  2. reading framee. none of the above
  3. triplet

46.Which of the following statements about ribosomes is false?

  1. A ribosome consists of two subunits.
  2. Ribosomal subunits are made of proteins and ribosomal RNA.
  3. Each ribosome has two binding sites for tRNA molecules.
  4. Ribosomes are not functional until both subunits are together
  5. The ribosome is the where protein modification and packaging occur

47.A physical or chemical agent that changes the nucleotide sequence of DNA is called a(n)

  1. terminator.
  2. transposon.
  3. mutagen.
  4. anticodon.

48.If a tRNA had an CAU anticodon, it could attach to a(n) ______mRNA codon.

  1. UCGb. AUGc. TCGd.UUGe. GUA

49.Below are three statements. Which of the following choices properly matches the statements with the correct biological processes?

I.This occurs in the nucleus of eukaryotic cells.

II.Transfer RNAs bind amino acids in the cytoplasm.

III.A polymerase enzyme is required.

  1. I: translation; II: translation; III: replication
  2. I: transcription; II: translation; III: translation
  3. I: transcription; II: translation; III: replication
  4. I: replication; II: translation; III: transcription
  5. I: replication; II: transcription; III: replication

50.What nucleotide sequence would be found on the partner DNA strand of the strand shown?

  1. ACTGTb. UGAGAc. TGACAd. TGUGU

51.Which plants in this figure must all be heterozygous?

A) purple-flowered plants in the P generation

B) white-flowered plants in the P generation

C) purple-flowered plants in the F1 generation

D) purple-flowered plants in the F2 generation

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