Which of the following is not correct about protostomes?
A. The developmental fate of each cell in the embryo is fixed when that cell first appears.
B. Embryonic cells cleave in a spiral pattern.
C. The mesoderm splits to form the coelom.
D. The blastopore becomes the animal's anus.
Answer: D
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Which of the following statements is true regarding the RNA of plant viruses? Select all
A. Outside of replication, the RNA of plant viruses is typically single-stranded. B. Outside of replication, the RNA of plant viruses is typically double-stranded. C. Plants cleave viral double-stranded RNA to form small-interfering RNAs. D. Plants cleave viral single-stranded RNA to form small-interfering RNAs. E. Plant viruses contain only single-stranded DNA, not RNA.
What are the primary sources of compounds used to develop antibiotics?
a. tree and flower extracts b. snake and scorpion venom c. bacteria and fungi d. fermented fruit sugars
Floods are worse after levees are built and wetlands are drained because
A. water moves into rivers more quickly. B. rainfall becomes more intense per unit area. C. the total volume of water increases. D. people complain more about damage. E. All of these are reasons floods are worse after levees are built and wetlands are drained.
Organogenesis
A. Arises from germ layer cells. B. involves failure of the organs to form. C. is when tadpoles become frogs. D. is the formation of the three germ layers. E. involves acrosomal reaction.