Tapeworms do not have a
(a) reproductive system.
(b) head.
(c) excretory system.
(d) digestive system.
(d) digestive system.
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Using the tryptophan operon as a model, explain a transcription pause site and the formation of a stem-loop
What will be an ideal response?
Four of the following were likely in Earth's earliest atmosphere. Which one was not?
a. hydrogen b. nitrogen c. oxygen d. carbon dioxide e. water vapor
During the process of glycolysis, which of the following substrates donates electrons to NAD+ and adds Pi to form 1,3-bisphosphoglycerate?
A) 3-phosphoglycerate B) 2-phosphoglycerate C) glyceraldehyde-3-phosphate D) glucose E) glucose-6-phosphate
C4 plants have better water conservation abilities than many other plants (especially C3). This is because:
A) C4 plants have smaller stomata that are protected by hairs and pits. B) C4 plants have the ability to obtain CO2 without opening their stomata. C) C4 plants open their stomata at night. D) C3 plants are able to keep their stomata closed during the day. E) C4 plants have no leaves; they use their stems for photosynthesis.