What is apotosis?
a. a process in development where cells die
back
b. the condition of being without a particular
sex
c. a structure in birds and some lizards that
functions as a penis
d. a cellular process whereby a cell reproduces
without mitosis or meiosis
e. the term given to describe the formation of
germ layers
A
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During swallowing, the _____ covers the entrance to the larynx. This structure is identified and labeled as letter _____
in the above diagram.
a. epiglottis; E b. pharynx; B c. glottis; C d. epiglottis; C e. trachea; E
Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.
Which of the following statements about the cell cycle is false?
(a) Once a cell decides to enter the cell cycle, the time from start to finish is the same in all eukaryotic cells. (b) An unfavorable environment can cause cells to arrest in G1. (c) A cell has more DNA during G2 than it did in G1. (d) The cleavage divisions that occur in an early embryo have short G1 and G2 phases.