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Free CLEP Science and Mathematics Exam Braindumps (page: 3)

Page 2 of 128
PDF with 494 Questions

Gregor Mendel identified "factors'" that could be passed down from parents to offspring and that resulted in the expression of certain characteristics. Today, we call Mendel's "factors"

  1. linked genes
  2. alleles
  3. genotypes
  4. phenotypes
  5. homologous chromosomes

Answer(s): B

Explanation:

Different forms of the same gene are called alleles. For example, B (brown) and b (blue) are two different possible eye color alleles in humans. No other answer choices fit the definition of a "factor" that results in the expression of a certain characteristic.



A decrease in the amount of carbon dioxide present in the air surrounding most plants would most likely result in

  1. the death of the plants
  2. an increase in the production of sugars through photosynthesis
  3. a decrease in the output of the Calvin cycle
  4. the breakdown of chlorophyll molecules in the mesophyll layer
  5. more nitrogen released into the air from the soil

Answer(s): C

Explanation:

Carbon dioxide is needed in the Calvin cycle to produce sugars, and there is no connection between the Calvin cycle and the building of nitrogen-producing compounds by a plant. The decrease in carbon dioxide would most likely not result in the plant's death, but it might hurt the plant by decreasing its ability to produce sugars. Chlorophyll molecules should be unaffected.



Fertilization of a human ovum normally occurs in the

  1. vagina
  2. ovary
  3. uterus
  4. somniferous tubule
  5. oviduct

Answer(s): E

Explanation:

The oviduct, or fallopian tube, is the usual site of fertilization of the ovum. It is here, after being released from the ovary, that an egg is most likely to meet sperm cells coming up from the vagina.



A DNA strand has a base sequence of CGTAGT. The mRNA strand transcribed from this DNA is:

  1. ACUACG
  2. CGTAGT
  3. GCAUCA
  4. GACUAC
  5. UACGUA

Answer(s): C

Explanation:

When DNA is transcribed into messenger RNA, the base-pairings are complementary but not identical. In addition, RNA has no thymine (T), only uracil (U). Thus, the correct complementary pairing would be A's with U's, T's with A's, and C's with G's or CGTAGT -> GCAUCA.






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