As part of the maturation process, red blood cells lose their nucleus. What is the consequence for cell division in these cells?
What will be an ideal response?
They cannot divide.
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Which one of the following is the transparent portion of the sclera in the front of the eye?
A. lens B. cornea C. pupil D. iris
A phenotype:
a) does not reveal the heritability of traits. b) consists of the observable properties of an individual. c) does not include an organism's behavior. d) cannot change during the course of an organism's life. e) depends on the genome rather than the environment.
Prokaryotic cells are represented by fossils that are dated back as far as _____ billion years ago.
A. 1.5 B. 2.8 C. 3.8 D. 4.8
Which of the following is mismatched?
A. Salk vaccine; requires boosters B. Sabin vaccine; live attenuated vaccine C. Salk vaccine; administered orally D. Sabin vaccine; less stable E. Salk vaccine; inactivated polio vaccine