Which feature possessed by most land plants is missing in mosses, which grow low to the ground in damp, shaded areas?
a) chlorophyll b, so they can only use filtered light for photosynthesis
b) starch production, so they only produce small amounts of glucose, since any beyond what they use immediately cannot be stored
c) cell walls, so they cannot stand upright
d) a protected zygote, so they must grow in damp areas to supply the zygote with moisture
e) vascular tissue, so they must grow along the ground in damp areas to supply water to the cells
Ans: e) vascular tissue, so they must grow along the ground in damp areas to supply water to the cells
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A controlled experiment is one in which ________.
A. there are at least two groups, one differing from the other by two or more variables B. there are at least two groups, one of which does not receive the experimental treatment C. the experiment is repeated many times to ensure that the results are accurate D. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
rRNA has an enzymatic role in all stages of protein synthesis
Indicate whether the statement is true or false.
Certain drugs use RNA interference as a mechanism of action. What molecule would the active compounds of these drugs be composed of?
A. Carbohydrate B. Steroid C. Protein D. Nucleic acid E. Small ion
When a tourist buys a sand dollar at a beach shop, what are they buying?
A. A calcium carbonate shell secreted from the mantle B. Anendoskeleton of calcium carbonate ossicles C. A molted exoskeleton made of chitin D. An endoskeleton made of bone E.An endoskeleton made of cartilage