You thinly slice a carrot root and place the slices on a medium containing nutrients and hormones necessary for plant growth. After a few weeks, you see that there are many little entire carrot plants growing from the root slices. Â The cells in the root can give rise to an entire plant because many plant cells are
A. totipotent.
B. pluripotent.
C. unipotent.
D. embryonic.
E. semipotent.
Answer: A
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Organisms that reproduce repeatedly are said to be
A. semelparous. B. cohorts. C. iteroparous. D. demographic. E. survivors.
Pyruvate is the end product of
a. glycolysis. b. acetyl-CoA formation. c. fermentation. d. the Krebs cycle. e. electron transport.
Homologous chromosomes are similar in all of these characteristics EXCEPT:
A. similar in size. B. carry the same alleles for all traits. C. carry genes for the same traits. D. similar in shape and location of the centromere
Where would you place the actual extinction date of a taxon if you knew that the Signor–Lipps effect was at work?
a. exactly at the date of the last known fossil b. before the date of the last known fossil c. after the date of the last known fossil d. unable to determine when extinction occurred relative to the date of the last known fossil.