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Free CLEP Science and Mathematics Exam Braindumps (page: 55)

Page 54 of 128
PDF with 494 Questions

Cancer cells are characterized by

  1. not exhibiting contact inhibition
  2. excess cytoplasm
  3. twice the number of chromosomes
  4. half the number of chromosomes
  5. controlled cell division

Answer(s): A

Explanation:

Cancer cells will continue dividing even when they are in contact with each other, thus exhibiting lack of contact inhibition. Normal cells will stop dividing when they come into contact with each other.



The sequence from gene to protein in eukaryotic cells is:

  1. Golgi apparatus, RNA, DNA, ribosomes
  2. DNA, RNA, ribosomes, Golgi apparatus
  3. DNA, Golgi apparatus, RNA, ribosomes
  4. RNA, ribosomes, DNA, Golgi apparatus
  5. DNA, ribosomes, RNA, Golgi apparatus

Answer(s): B

Explanation:

DNA is transcribed into RNA inside the nucleus. After processing, the RNA is exported into the cytoplasm. Next the mRNA and ribosomes form a complex to translate the genetic code into a polypeptide chain. These polypeptide chains may be further processed in the Golgi apparatus.



The genetic code is:

  1. different for all living organisms
  2. universal for all living organisms
  3. the same only for some genes for some organisms
  4. the same for animals grouped in the same family
  5. the same for animals in the same species

Answer(s): B

Explanation:

The RNA base triplets code for the same amino acids for all organisms.



DNA and RNA have all of the following in common except:

  1. the base pairs G and C
  2. double helix structure
  3. nucleotide bases
  4. phosphate groups
  5. a 5' end and a 3' end

Answer(s): B

Explanation:

DNA forms a double helix structure. RNA is single-stranded and complementary regions will form hydrogen bonds; however, it does not form a double helix.






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