Which of the following is not true of a codon? a) it consists of three nucleotides. b) it may code for the same amino acid as another codon. c) it never codes for more than one amino acid. d) it extends from one end of a trna molecule. e) it is the basic unit of the genetic code.

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?

Some species of wasps are social. the queen starts a colony from scratch each spring. she builds a small nest, and lays and raises a group of female workers. the workers enlarge the nest while the queen continues to lay eggs. unfertilized eggs become males that mate with newly hatched females. all of the wasps except the newly fertilized females die by the summer. which best describes this behavior? a)it is beneficial only to the males that do not fertilize eggs. b)it is beneficial only to the female workers that are not fertilized. c)it is beneficial to each one of the individual colony members. d)it is beneficial to the whole species, but not to all of the individual members.

Astudent constructs a venom diagram to compare the organelle last in plant and animal cells which organelle should be listed under “both” in the diagram?