Which of the following is a flagellated cell in sponges that gathers food and circulates water?
a) collar cells
b) amoebocytes
c) spicules
d) spongin
e) porocytes
Answer: a) collar cells
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The availability of genomic data has allowed scientists to construct more accurate phylogenetic trees than those based on fossil evidence alone
a. True b. False Indicate whether the statement is true or false
The class of neurotransmitters that most commonly acts as a modulator of postsynaptic cell response are the
A. amino acids. B. gases such as nitric oxide. C. neuropeptides. D. biogenic amines. E. acetylcholine.
The portion of the cytoskeleton that attaches, pulls, and guides the chromosomes during cell division is the
A. kinetochore. B. Golgi body. C. mitotic spindle. D. centrosome. E. centromere.
Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? The animal cell is in _____
A) a hypotonic solution, and the plant cell is in an isotonic solution B) an isotonic solution, and the plant cell is in a hypertonic solution C) a hypertonic solution, and the plant cell is in an isotonic solution D) an isotonic solution, and the plant cell is in a hypotonic solution