Which of the following is true of spirochaetes?
A. They have peritrichous arrangement of flagella
B. They are gram-positive
C. They are able to penetrate a host's tissues
D. They are all sexually transmitted
Ans: C. They are able to penetrate a host's tissues
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In the Hershey and Chase experiment, 32P was used to label ____ and 35S was used to label ____
a. RNA; protein b. protein; DNA c. phospholipids; protein d. protein; phospholipids e. DNA; protein
Ions can be moved against the concentration gradient to create a difference in charge across that membrane. Later, the electrochemical gradient can be exploited by the cell to drive other processes. Respectively, what are these two mechanisms called?
a. primary passive transport, secondary passive transport b. primary sodium transport, secondary potassium transport c. primary active transport, secondary active transport d. primary electrical transport, secondary electrical transport
____ is believed to be produced in the leaves and transported to the phloem in the shoot apical meristem
a. Jasmonic acid b. Florigen c. Brassinosteroid d. Abscisic acid e. Ethylene
An mRNA sequence is 5?-AUG GGC ACU CAU ACU UAA-3?, where AUG is the start codon and UAA is the stop codon. How many distinct aminoacyl-tRNA synthetases are required to translate the mRNA sequence?
A. six B. two C. five D. four E. three