Protons and neutrons make up the atom's central core, which is referred to as its ________.
A. center of gravity
B. valence number
C. isotope
D. nucleus
Answer: D
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Cladograms include in the phylogenetic tree shared primitive characters and shared derived characters. The derived characters can also be called ______ why the primitive characters can also be called ___________.
A. character states; symplesiomorphy B. symplesiomorphy; ingroup C. outgroup; synapomorphy D. synapomorphy; outgroup E. synapomorphy; symplesiomorphy
Which of the following best characterizes the process of clonal selection that occurs after exposure to a particular pathogen?
A. B cells show the ability to adapt the specific type of receptors they produce and so all B cells in the body undergo an alteration to respond to a particular infection. B. Only a small subset of B cells will have receptors that bind a particular pathogen and it is specifically these cells that are stimulated to multiply to fight the infection. C. Pathogens typically reproduce clonally and "clonal selection" refers to the process of selection among pathogen lines to determine which are successful during host infection. D. All of the statements are accurate characterizations of the process of clonal selection.
The structure that people typically refer to as a "mushroom" is technically called the ____
a. Basidiocarp b. Mycelium c. Ascocarp d. hyphal mass e. Zygospore
____is used within the cell’s membrane and as a precursor to other steroids synthesized by cells.