Worldwide declines in the population size of frogs have recently been linked to ____
a. overharvesting
b. a fungus
c. dams
d. decreases in global temperatures
e. increases in precipitation
B
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If while investigating spontaneous generation, Pasteur had his laboratory located in a stable
A. the results would, most likely, have supported the idea of spontaneous generation. B. the results would, most likely, have not supported the idea of spontaneous generation. C. this would have had no effect on his results. D. this would have shown his love of horses.
The clustered, regularly interspaced short palindromic repeats (CRISPR) system in bacterial cells has been called the "immune" system of bacteria. CRISPR protect bacteria from a repeat infection from the same phage because bacterial cells
A. recognize proteins on the surface of the phage and secrete enzymes that digest the phage. B. recognize proteins on the surface of the phage and secrete proteins that block the binding of the phage. C. integrate fragments from the phage DNA in their own chromosomes and target for destruction any DNA that contains the same fragments in the future. D. modify the attachment sites for the phages so that new infections cannot take place.
A nonphotosynthetic plant sharing a mycorrhizal fungus with a photosynthetic plant is best described as a
A. mutualist. B. epiparasite. C. parasite. D. host. E. symbiont.
Endosperm tissue is:
a. 1/2 n b. n c. 2n d. 3n e. 4n