What is symbiosis?
What will be an ideal response?
groups of organisms living together for mutual benefit
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Which of the following functions is not associated with the presence of feathers in birds?
a. temperature regulation b. minimization of water loss c. respiration d. flight e. protection
Which of the following structures contains the receptor protein importin?
A) mitochondrion B) nucleolus C) chloroplast D) plastid E) nucleus
Which of the following is not true of a codon?
A. It consists of three nucleotides. B. It is the basic unit of the genetic code. C. It extends from one end of a tRNA molecule. D. It may code for the same amino acid as another codon. E. It never codes for more than one amino acid.
The classic experiments conducted by Meselson and Stahl demonstrated that DNA replication is accomplished by employing a ________________ mechanism
(a) continuous (b) semiconservative (c) dispersive (d) conservative