Suppose that you examine an animal and find it has excretory structures that have a closed proximal end immersed in hemolymph and a distal end that empties into the gut. Which term should you use to describe these structures?
a. hepatic tubules
b. Malpighian tubules
c. nephrons
d. metanephridia
Ans: b. Malpighian tubules
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Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of
event Y occurring is 1 in 5, the probability of both events occurring is ____.
a. (1/4)2 + (1/5)2 = (1/16) + (1/25) = (25/400) + (16/400) = 41/400 b. (1/4) + (1/5) = (5/20) + (4/20) = 9/20 c. (1/4)2(1/5)2 = (1/16)(1/25) = 1/400 d. (1/4)(1/5) = 1/20 e. (1/4 + 1/5)2 = (5/20 + 4/20)2 = (9/20)2 = 81/400
In the absence of a repressor, where will RNA polymerase bind to a prokaryotic operon to initiate transcription?
a. transcriptional start site b. operator c. promoter d. coding region
Approximately how large is the human genome?
A) 20,000 bp B) 1 billion bp C) 3 billion bp D) 13 million bp E) 30 billion bp
Achondroplasia is a form of human dwarfism. If two individuals with achondroplasia have children with the following ratio, 2 dwarf to 1 wild type, what is the means of inheritance of this phenotype?
A) epistasis B) recessive lethal C) dominant lethal D) simple recessive E) simple dominance