What advantages does a complete digestive tract have over a blind-ended gastrovascular cavity?
What will be an ideal response?
A complete digestive tract allows food to be processed in stages and for parts of the digestive tract to become differentiated for specialized functions.
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A diploid cell has 44 chromosomes. After meiosis I, how many chromosomes does it have? How many chromatids?
A) 22; 22 B) 22; 44 C) 44; 22 D) 44; 44
Single-gene disorders are described by all of the following except
A. they occur in 1 out of every 100 people. B. they are cannot be tracked using a pedigree chart. C. we know the most about them compared to other types of disorders. D. they could be caused by dominant or recessive allele. E. causative alleles may persist in the population due to a survival advantage.
What is the role of monoamine oxidase and acetylcholinesterase in the nervous system?
a. To produce neurotransmitter molecules. b. To serve as receptors for neurotransmitter molecules. c. To breakdown neurotransmitter molecules.
At the start of translation, the initiator tRNA pairs with the start codon at the ____ of the ribosome
a. A (aminoacyl) site b. promoter c. P (peptidyl) site d. ribosomal binding site e. E (exit) site