The human genome contains approximately 20,000 protein-coding genes, yet it has the capacity to produce several hundred thousand gene products. What can account for the vast difference in gene number and product number?
A) Much of the DNA is in the form of trinucleotide repeats, thus allowing multiple start sites for different genes.
B) There are more exons than introns.
C) Alternative splicing occurs.
D) There are more introns than exons.
E) Every gene can be read in both directions, and each gene can have inversions and translocations.
C
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Which of the following is derived from the ground tissue system?
A) root hair B) cuticle C) periderm D) pith E) phloem
Answer the question using the accompanying graph. Which portion of the graph shows the activation energy in the
absence of enzyme?
a. A b. B c. C d. W + X e. Y + Z
All of the following are involved in light production of bioluminescent bacteria except:
a. luciferin. b. luciferase. c. cellulose. d. oxygen.
Tastes and smells are distinct kinds of environmental information in that _____
A) neural projections from taste receptors reach different parts of the brain than the neural projections from olfactory receptors B) the single area of the cerebral cortex that receives smell and taste signals can distinguish tastes and smells by the pattern of action potentials received C) tastant molecules are airborne, whereas odorant molecules are dissolved in fluids D) distinguishing tastant molecules requires learning, whereas smell discrimination is an innate process