Which protistan structure is NOT correctly matched with its function?
A. cyst-a reproductive structure
B. pseudopodia-movement and feeding
C. pyrenoid-synthesis of starch
D. trichocyst-defense and capture of prey
Answer: A
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Szostak and colleagues found that a ribozyme found in the human genome was related to a similar enzyme in human
hepatitis delta virus (HDV). In order to identify this ribozyme, they: A. searched the published human genome sequence for HDV sequences. B. searched the published human genome sequence for ribozyme sequences. C. incubated HDV RNA and evaluated the sample for ribozyme activity. D. incubated human RNA and evaluated the sample for ribozyme activity.
Which plants do not have roots?
A) Bryophytes B) Ferns C) Angiosperms D) Gymnosperms
All of the following are criteria by which a species may be defined EXCEPT
A. the ability to reproduce. B. possession of a shared gene pool. C. ability to hybridize through interbreeding. D. reproductive isolation. E. the ability to produce fertile offspring.
A zygote is a fertilized egg formed by an egg and a sperm. The zygote undergoes many mitotic events as it develops into a solid ball of cells (ie, blastomeres) called a blastula. What changes occur in this early cleavage?
A. During the initial stages of cleavage, there is a tremendous increase in the number and size of blastomeres. B. During the initial stages of cleavage, there is no increase in the number of cells of the developing organism, but the size of the cells increases. C. During the initial stages of cleavage, there is a tremendous decrease in the number and size of blastomeres. D. During the initial stages of cleavage, there is a tremendous increase in the number of cells coupled with a decrease in the size of the cells composing the developing organism.