Describe what scientists feel may be the first step in the evolution of cellular organization.
What will be an ideal response?
The first step may be spontaneous formation of microspheres by molecules having hydrophobic regions. These microspheres have many cell-like properties, including an outer boundary of two layers, the ability to increase in size, and the ability to divide.
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Amino acid sequences evolve through: (choose all that apply)
A. mutation. B. selection. C. adaptation. D. translation.
B cells are primarily activated by the activities of ________
a. macrophages b. platelets c. helper T cells d. antigen and complement
__________ fights infection by increasing the metabolic rate. Fill in the blank(s) with the appropriate word(s)
To find a specific DNA sequence in a genomic library, researchers employ single-stranded RNA or
DNA molecules called _________. Fill in the blank(s) with the appropriate word(s).