Which of the following is NOT a free-floating photosynthetic organism found in a lake?
A. phytoplankton
B. green algae
C. zooplankton
D. cyanobacteria
E. diatom
Answer: C. zooplankton
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An egg of the organism of S. mansoni is isolated from the feces of an adult man who has been traveling in Africa. An unoperculated egg with a large lateral spine is recovered. The patient is administered the standard dose of praziquantel; however, his infection does not improve. Which one of the following statements explains this discrepancy?
a. Metrifonate should have been adminis-tered. b. Bilarcil is the drug of choice for this type of infection. c. Steroids should have been initially admi-nistered. d. A larger dose may be required to be effec-tive against this organism.
Reactive oxygen intermediates and reactive nitrogen intermediates produced by phagocytic cells are effective in killing invading microorganisms.
Answer the following statement true (T) or false (F)
Parasitoidism is a form of mutualism
Indicate whether the statement is true or false
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.