Which statement regarding the human genome is false?
A) Long stretches of repetitive DNA are prominent at centromeres and ends of chromosomes.
B) The human genome is smaller than that of the bacterium Haemophilus influenzae.
C) Current estimates are that there are about 21,000 genes in the human genome.
D) The human genome contains approximately 19% introns.
Answer: B
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While fishing, a biology student makes the following observations:
1) Water spiders appear to be able walk on the surface of the water. 2) Flat rocks may be made to skip across the water. Which of the following properties of water can explain these observations? A) Water is an excellent solvent. B) Water molecules create spheres of hydration around solute molecules. C) Water molecules are cohesive. D) Water molecules are often associated via hydrogen bonds. E) both choices C and D
Caldarchaeol lipids are extremely thermostable tetraethers found in many ________.
A. hypersalinic archaea B. autotrophic archaea C. psychrophile archaea D. hyperthermophilic archaea
Which of the following is true of an individual with blood type AB?
a) They have red blood cells with A antigens only. b) They have red blood cells with A and B antigens. c) They are classified as the "universal donor" and can donate blood to anyone. d) They produce A and B antibodies. e) They can receive blood from blood type O individuals only.
Excessive collagen formation often results in a hard, raised scar. This is called what?
What will be an ideal response?