Rigid bacteria with a helical cell shape are called ________.
A. vibrios
B. spirilla
C. coccobacilli
D. spirochetes
Answer: B
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Of the ________ electrons released in Nitrosomonas europaea nitrification, ________ must return to AMO to continue ammonia oxidation, while ________ can be used either as reductants for biosynthesis or be donated to the electron transport chain to reduce the terminal electron acceptor, oxygen.
Fill in the blank(s) with the appropriate word(s).
Approximately 95 percent of cases of cervical cancer are caused by _____.
A. cystoceles B. poor hygiene C. genetic factors D. the human papilloma virus (HPV)
Despite causing a life-threatening disease, the sickle-cell allele in some areas of Africa has remained in high frequency in those populations because it protects against malaria
In the United States, malaria was eradicated shortly before World War II by eliminating the mosquito that spreads the disease. What is likely to happen to the frequency of the sickle-cell allele in African Americans living in the United States? A) The frequency of the sickle-cell allele will decrease. B) The frequency of the sickle-cell allele will not change. C) The sickle-cell allele will disappear from the African American population. D) The normal allele will disappear from the African American population. E) The frequency of the sickle-cell allele will increase.
The gametophyte is photosynthetic and nutritionally independent
A. only in the liverworts. B. in all seeds plants. C. only in the ferns. D. in the bryophytes and pterophytes. E. in all tracheophytes.