The green arrow in the diagram above represents:
a) number of evolved characteristics.
b) direction of stabilizing evolution.
c) number of common ancestors.
d) evolutionary advancement.
e) time.
Ans: e) time.
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The initial amino acid incorporated into a nascent peptide is N-formylated in
A) eukaryotic translation. B) prokaryotic transcription. C) prokaryotic translation. D) both choices A and C E) both choices B and C
A closed circulatory system is seen in:
a. leeches only b. roundworms only c. flatworms only d. cnidarians only e. both earthworms and leeches
In the above figure, which of the following would
have a haploid number of chromosomes? a. zygote b. multicelled sporophyte c. spores d. multicelled gametophytes e. both c and d
All of the following statements about the cohesion-tension model are true EXCEPT
A. it is a model of how water and minerals are transported in xylem. B. it is dependent on the cohesive and adhesive properties of water. C. there is no expenditure of energy. D. tension created by transpiration in the leaves pulls water along the phloem from the roots hairs to the leaves.