All species of streptococci are pathogens.
A) True
B) False
Feedback: This answer is false, the genus streptococci includes harmless commensals as well as pathogens.
B) False
Feedback: This answer is false, the genus streptococci includes harmless commensals as well as pathogens.
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In bacterial synthesis of polysaccharides, such as starch and glycogen, glucose is donated to the end of the growing chain by ADP-glucose. A similar reaction occurs in bacterial branching of phospholipids when phosphatidic acid is attached to a ________.
A. dihydroxyacetone phosphate B. fatty acyl-ATP C. acetyl-CoA D. cytidine diphosphate carrier
The second trophic level in this food web would be filled by the __________
a. beetle b. spider c. possum d. spider and possum
Evidence that exposure to song is important in white-crowned sparrows learning to sing includes which of the following?
A. They need to hear songs from other male white-crowned sparrows from 10–50 days after hatching. B. They need to hear songs from any sparrow from 10–50 days after hatching to sing properly. C. White-crowned sparrows raised in a laboratory cannot learn how to sing properly. D. They must imprint on their father to learn how to sing their song properly. E. They will not produce any song at all if they do not hear other birds sing.
________ selection and ________ selection tend to reduce the amount of variation in a population, whereas ________ selection tends to increase the amount of variation in a population
Fill in the blank(s) with correct word