Which of the following is true of both T cells and B cells?
A. They produce effector cells against specific pathogens.
B. They are produced from stem cells of the bone marrow.
C. They can attack and destroy invading pathogens.
D. They have a short life span.
E. All of these statements are true.
E. All of these statements are true.
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Extracellular molecules activating membrane proteins that in turn activate molecules inside the cell that control differentiation is an example of signal ____
Fill in the blank with the appropriate word.
In horses, black coat color is influenced by the
dominant allele (B), and chestnut coat color by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the recessive allele (t). What color horse would you use to find out the genotype of a black trotter? Give the genotype and phenotype. What will be an ideal response?
Some viruses cause disease; they act as __________
in humans. Fill in the blank(s) with the appropriate word(s).
The simplest nerve pathway is
a. located in the midbrain. b. the reflex pathway. c. found in the lower part of the brain. d. found in the autonomic nervous system. e. in the flow of information from a sense receptor to the brain.