Which of the following statements is FALSE?
a. Hormones are long distance signaling molecules.
b. Nanotubes allow the movement of organelles between adjacent cells.
c. Cytokines may act as small, long distance signaling molecules.
d. Paracrine signaling molecules are one type of chemical communication betweenorganisms
e. Steroids are hydrophobic molecules derived from cholesterol.
D
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The system responsible for the breakdown of food for the body to use is called the _________ system
Fill in the blank(s) with correct word
Which is the correct sequence of structures sperm travels through prior to ejaculation?
a. ductus deferens---epididymis---ejaculatory duct---urethra. b. urethra---ductus deferens---epididymis---ejaculatory duct. c. epididymis---ductus deferens---ejaculatory duct---urethra. d. epididymis ---ductus deferens---ejaculatory duct---urethra. e. ejaculatory duct---ductus deferens---epididymis ---urethra.
The cells in this layer of epidermis are dead, and their flat, scale-like remnants are filled with keratin
A) stratum granulosum B) stratum spinosum C) stratum corneum D) stratum basale