After mutagenesis and screening, you have found a mutant that is able to grow in soil with high salt content. Chemical analysis showed that this plant has a decreased amount of Na+ relative to normal plants
What kind of mutation do you predict this plant contains?
A) mutation in the plasma membrane sodium channel
B) mutation in the metallothioneins
C) mutation in the tonoplast sodium channel
D) mutation in the tonoplast antiporter
Answer: A
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Which of the following series is arranged in the correct sequence for nitrogen fixation and its subsequent use?
A. atmospheric nitrogen; use of bacterial nitrogenase; production of ammonia; conversion by plants or algae; synthesis of proteins B. atmospheric nitrogen; use of bacterial nitrogenase; conversion by plants or algae; production of ammonia; synthesis of proteins C. atmospheric nitrogen; production of ammonia; use of bacterial nitrogenase; conversion by plants or algae; synthesis of proteins D. atmospheric nitrogen; production of ammonia; use of bacterial nitrogenase; synthesis of proteins; conversion by plants or algae E. ammonia; conversion by plants and algae; production of atmospheric nitrogen; use of bacterial nitrogenase; synthesis of proteins
Smoking tobacco regularly during pregnancy
results in all EXCEPT a. increased risk of miscarriage. b. newborns of lower birth weight. c. reduced vitamin C levels for the mother-tobe and for her fetus. d. fetal facial and cranial deformities. e. higher incidence of fetal heart defects.
All of the following infections can result from drinking contaminated water EXCEPT
A) Cyclospora infection. B) giardiasis. C) trichinellosis. D) cholera. E) cryptosporidiosis.
Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail. Overall, these viruses are said to have ________ symmetry.
A. radial B. binal C. complex D. bilateral