In the development of a seedling, which of the following will be the last to occur?
A. initiation of the breakdown of the food reserve
B. Initiation of cell division in the root meristem
C. Emergence of the root
D. Expansion and greening of the first true foliage leaves
E. Imbibition of water by the seed
Answer: D. Expansion and greening of the first true foliage leaves
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Humans are incidental hosts for ________, thus infected humans CANNOT spread the disease
A) Toxoplasma gondii B) Trichomoniasis vaginalis C) Entamoeba histolytica D) Plasmodium vivax
Using Figure 17.5 in your textbook, identify a 5' 3' sequence of nucleotides in the DNA template strand for an mRNA coding for the polypeptide sequence Phe-Pro-Lys.
A. 5'-CTTCGGGAA-3' B. 5'-UUUGGGAAA-3' C. 5'-AAACCCUUU-3' D. 5'-GAACCCCTT-3' E. 5'-AAAACCTTT-3'
What do we call the first species that invade a new island that has risen from the ocean?
A) pioneer species B) invaders C) climax communities D) commensals
Which description of antigenic drift and antigenic shift in the influenza virus is incorrectly matched?
A) Antigenic shift: May result in a pandemic outbreak due to widespread lack of immunity. B) Antigenic drift: A host vaccinated against an influenza strain before antigenic drift may lack effective immunity and be susceptible to infection. C) Antigenic drift: Spontaneous mutation leads to a minor change in HA or NA spikes. D) Antigenic shift: Often leads to viral strains with new features such as increased infectivity or expanded host range. E) Antigenic drift: Often involves reassortment of viral strains in an animal host followed by a "species jump" to humans.