All genetically normal humans have
a) 44 autosomes
b) 23 chromosomes
c) 46 autosomes
d) 8 toes
e) two pairs of 22 autosomes, a Y chromosome, and an X chromosome
Answer: a) 44 autosomes
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If you diligently wash hands before and after lab, you don’t need to wear gloves.
A) True B) False
A heart with three chambers, one atrium, and two ventricles is shared by _____.
A. reptiles and mammals B. reptiles and amphibians C. amphibians and mammals D. birds and mammals E. birds and reptiles
E. coli can synthesize the amino acid threonine or absorb it from the environment. In the thr operon, the repressor is active when it is bound to threonine. If an E. coli bacterium is in an environment where threonine is absent, will transcription of
threonine synthesis genes take place? Why or why not? A) yes, because threonine will not be bound to the repressor, so the repressor will be inactive B) no, because threonine will not be bound to the repressor, so the repressor will be inactive C) yes, because threonine will not be bound to the repressor, so the repressor will be active D) no, because threonine will not be bound to the repressor, so the repressor will be active
Which of the following occurs during initiation of translation?
A. The ribosome moves down one codon so that the A site is available to receive an incoming tRNA. B. One of the three stop codons is reached. C. The ribosome dissociates into its two subunits and falls off the mRNA. D. The mRNA binds to the smaller of the two ribosomal subunits. E. The polypeptide lengthens one amino acid at a time.