Thursday
October 23, 2014

Homework Help: biology

Posted by Angela on Friday, February 8, 2013 at 11:34pm.

Will someone please check my answers?
1. Which process results in an individual inheriting the incorrect number of chromosomes?
a.)mutation
b.)nondisjunction<--
c.)segregation error
d.)duplication error
e.)linkage

2. Which data in Hershey and Chase's experiment supported that DNA was the genetic material?
a.)The radiolabeled phosphorus was found within the infected cell.
b.)The radiolabeled phosphorus was incorporated into the host DNA.<-----
c.)The radiolabeled sulphur was found within the infected cell.
d.)Both the radiolabeled phosphorus and sulphur occurred in the infected cell.
e.)The amount of radiolabeled sulphur increased during cell division.

3. In organisms that can switch between asexual and sexual reproduction, which conditions will favor sexual reproduction?
a.)stable environment
b.)limited competition for resources
c.) fluctuating environmental conditions
d.)unlimited mates<----
e.)increased competition for mates

4. Which best describes the overall process of DNA replication?
a.)DNA helicase unzips the double helix, DNA polymerase replicates the new strand, and DNA ligase binds the Okazaki fragments.<--
b.) DNA polymerase unzips the double helix, DNA polymerase replicates the new strand, and DNA helicase binds the Okazaki fragments.
c.) DNA polymerase unzips the double helix, DNA helicase replicates the new strand, and DNA ligase binds the Okazaki fragments.
d.)DNA ligase unzips the double helix, DNA helicase replicates the new strand, and DNA polymerase binds the Okazaki fragments.
e.)DNA ligase unzips the double helix, DNA polymerase replicates the new strand, and DNA helicase binds the Okazaki fragments.

5. Which best describes the key discovery by Avery, MacLeod, and McCarty?
a.)DNA has a double helix structure.
b.)DNA is the genetic material.<----
c.) DNA consists of chromosomes.
d.)DNA is found in all organisms.
e.) DNA codes for proteins.

6. Which statement about the daughter cells produced from asexual reproduction in bacteria and archaea is correct?
a.)They have genetic material identical with the parental cells.<---
b.)They contain half the amount of the genetic material of the parental cells.
c.)They contain some variation of the parental genetic material.
d.)They contain twice the genetic materials of the parental cells.
e.)They contain a combination of genetic material from the two parental cells.

7. Which is not true about RNA?
a.)It is a single strand.
b.)It has ribose.
c.)It is transcribed from DNA.
d.)Uracil replaces thymine.
e.)Only one type exists.<----

8. What is the genotype of an individual with Klinefelter's syndrome?
a.) XYY
b.) XXX
c.) XY
d.)XXY<----
e.)XO

9. Which function is incorrect for processes of protein synthesis?
a.)The release factor adds water to the peptide chain.
b.)The P site is the location of the growing peptide chain.
c.)The E site is the exit site of the tRNA.
d.)The A site is the binding site of aminoacyl-charged tRNA.
e.)The AUG codon signals to release the rRNA complex.<--

10. Chargaff's study of nucleotides found in human DNA 30.3% adenine and 19.5% guanine. Based on these data, what percentages of thymine and cytosine did Chargaff mostly likely observe?
a.)thymine 19.5%, cytosine 19.5%
b.)thymine 30.3%, cytosine 30.3%
c.)thymine 22.5%, cytosine 19.5%
d.) thymine 19.5%, cytosine 30.3%
e.) thymine 30.3%, cytosine 19.9%<--

11. Which best describes how retroviruses function?
a.)They transcribe viral DNA into RNA using host cell machinery and the enzyme reverse transcriptase.
b.) They transcribe viral RNA into DNA using host cell machinery and the enzyme reverse transcriptase.<-----
c.)They transcribe viral RNA into DNA using viral cell machinery and the enzyme reverse transcriptase.
d.)They transcribe viral RNA into DNA using host cell machinery and the enzyme reverse translatase.
e.)They transcribe host RNA into DNA using host cell machinery and the enzyme reverse transcriptase.

12. Which is not a characteristic of eukaryotic DNA?
a.) double helical design
b.)linear shape
c.) plasmid-containing<----
d.) telomere structure
e.) one replication initiation site

13. Which is the main role of meiosis in animals?
a.) to repair cells
b.) to reproduce<----
c.) to assist growth
d.) to form gametes
e.) to form gametes immediately in plants

14. Why is mitochondrial DNA only inherited from the mother?
a.) The genetic code for mDNA occurs on the X chromosome.
b.) The offspring inherits the cytoplasmic material from the egg.<-----
c.) The expression of the mDNA is influenced by genes on the X chromosome.
d.) Mitochondrial is only required in females.
e.) The mitochondrial DNA inherited from males is nonfunctional.

15. Why is the fern life cycle considered an alternation of generations?
a.) The structures shift from macrophyte to microphyte structures.
b.) The genotype shifts between two distinctive diploid states.
c.) The cycle shifts between two distinctly different phenotypes.
d.) The cycle shifts from the sporophyte generation to the gametophyte generation.<-----
e.) The cycle shifts from an asexual state to a sexual state.

16. Which genes will tend to move together during the process of meiosis?
a.) genes located on opposite ends of the same homologous chromosome
b.) genes located on the sex chromosomes
c.) genes located on different homologous chromosomes
d.) genes located near each other on a chromosome<----
e.) genes located far away from a crossing over point

17. Which is not the correct description for levels of protein structure?
a.) amino acid sequence: primary structure
b.) alpha helix and beta sheets: secondary structure
c.) hydrogen bonding: secondary structure
d.) R group interactions: tertiary structure
e.) disulfide bonds: quaternary structure<------

18. The crown of thorns sea star is a threat to coral reefs because it feeds on coral tissue. Conservationists originally planned to rid reefs of these pests by collecting them and cutting them into pieces. They later found that cutting them apart actually increased the population of crown of thorns. Which process was responsible for this increase?
a.) binary fission
b.) fragmentation<-----
c.) budding
d.) parthenogenesis
e.) cloning

19. Which is not a contribution of Gregor Mendel?
a.) He determined that "factors" are passed from parent to offspring.
b.) He recognized that some traits are dominant while others are recessive.
c.) He developed the law of independent assortment.
d.) He described the presence of linked genes.<-------
e.) He described the law of segregation.

20. Which is not a characteristic of Watson and Crick's model of DNA?
a.) Alternating sugars occur on each strand.
b.) The nucleotide bases occur on the internal structure.
c.) The nucleotide bases pair as A with T and G with C.
d.) Disulfide bonds occur between the sugars and nucleotides.<------
e.) Hydrogen bonds occur between bases on adjacent strands.

21. How does meiosis support Mendel's laws?
a.) Each gamete only receives one allele for a trait.
b.) Gametes receive alleles randomly.
c.) Linked genes move together during meiosis.
d.) Genetic variation is a result of meiosis.
e.) Replicated chromosomes divide equally between daughter cells.<------

22. What is the result of a cross between an individual who is Hhtt with one who is hhTT? Use a Punnett square if necessary.
a.) 2 : 1 : 1
b.) 9 : 3 : 3 : 1<-------
c.) 5 : 4 : 1
d.) 2 : 2 : 1 : 1
e.) 9 : 6 : 1

23. Which does not describe a modification of RNA prior to its leaving the nucleus?
a.) addition of a 5' GTP cap
b.) addition of a 3' poly-A tail
c.) addition of the initiation complex<------
d.) removal of introns
e.) splicing of exons

24. Which characteristic of autosomal dominant disorders make them rare?
a.) Individuals do not live to reproductive age.<-------
b.) Viable zygotes do not occur.
c.) The trait is not hidden by heterozygote carriers.
d.) Individuals with the trait are sterile.
e.) Autosomal dominant disorders require two copies of the allele.

25. Which aspect of DNA structure results in the equal spacing seen in the X-ray diffraction?
a.) Certain bases pair with other bases.<-------
b.) Sugars are bound to bases.
c.) Bases are of equal size.
d.) Hydrogen bonds hold the two strands together.
e.) DNA consists of nucleotides and not amino acids.

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