Which lineage includes the fleshy-finned fishes, with fins supported by muscles and an internal bony skeleton?
a. Sarcopterygii
b. Petromyzontoidea
c. Myxinoidea
d. Actinopterygii
Answer: a. Sarcopterygii
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Which of the following statements about the angiosperm embryo sac is FALSE?
A. It contains eight nuclei. B. It is the gametophyte generation of the plant. C. The nuclei within the embryo sac are diploid. D. The synergids flank the egg cell. E. The embryo sac nuclei are the product of mitotic division of a megaspore.
Although it contributes no cells to the embryo, this structure guides the formation of the primitive streak:
A) endoderm B) mesoderm C) ectoderm D) neural crest E) hypoblast
What is the role of the U1 snRNP?
What will be an ideal response?
Which of the following might be missed if viable counts are done on food and/or water specimens?
A. Pathogenic bacteria B. Aerobic bacteria C. Viable but nonculturable cells D. Endospores