A taxon that includes a single common ancestor and some, but not all, of its descendants is a _____ group
A. monophyletic
B. paraphyletic
C. polyphyletic
B
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What kinds of cells engulf whatever foreign cells and molecules they encounter and recognize?
A) natural killer cells B) red blood cells C) phagocytic cells D) B cells
Proteins are often composed of two or more distinct modules that fold up independently of one another. They often represent parts of a protein that function in a semi-independent manner. These modules are called _____.
A) protein motifs B) dominoes C) functionals D) domains
Describe one technique that can be used to generate multiple copies of a gene that is of interest to a researcher
What will be an ideal response?
While hiking, you must push aside thick branches that are near your face. One of them rips the skin on your arm and you begin to bleed from the cut. Which of the following plays an important role in initially protecting you from infection?
A) nonspecific antibodies B) barriers such as dead skin cells and mucus because they are part of the innate immune system C) increased production of certain hormones and changes in microcirculation D) memory cells because they are part of the adaptive immune system