In the figure, the dots in the space between the two structures represent which of the following?
A) receptor molecules
B) signal transducers
C) neurotransmitters
D) hormones
E) pheromones
Ans: C) neurotransmitters
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The collection of the parenchyma cells inside the root epidermis is called the ____
Fill in the blank with the appropriate word.
Which organ system includes the pituitary, thyroid, and adrenal glands?
a. endocrine system b. reproductive system c. lymphatic system d. respiratory system e. skeletal system
Which statement about antigen recognition in B and T cells is TRUE?
A) B cell antigen receptors can bind to intact freely circulating antigens that are bound to self proteins. B) T cell antigen receptors can bind to intact antigens that are bound to self proteins. C) B cell antigen receptors can bind to intact antigens that are on pathogen surfaces. D) T cell antigen receptors can bind to intact freely circulating antigens.
It has often been said that the next dominant animals on land, after a hypothetical demise of all mammals, would be insects. Why so?
What will be an ideal response?