Cell size is limited because _________ is critical to a cell's function
A) the size of the nucleus
B) the ability to photosynthesize
C) the number of microvilli
D) surface-area-to-volume ratio
E) cilia movement
Answer: D) surface-area-to-volume ratio
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True or false: All changes in gene sequence are mutations, but not all mutations decrease or increase in frequency over time
A. true B. false
Which one of the following statements about the use of synthetic polynucleotides in cracking the genetic code is not true?
A. Poly(A) RNA directs the synthesis of only polylysine in vitro. B. Particular codons are generated in predictable ratios with random RNA polymers containing specific ratios of different nucleotides. C. Three different amino acids are incorporated into peptides when synthetic polymers of only one nucleotide are used to synthesize the RNA polymer. D. The codon table was completed by using RNA polymers of defined sequences.
Taking food into the mouth
What will be an ideal response?
All microorganisms are best defined as organisms that
A. cause human disease. B. lack a cell nucleus. C. are infectious particles. D. can only be found growing in laboratories. E. are too small to be seen with the unaided eye.