What is a shared characteristic of flatworms and nematodes?
a. Poorly developed excretory systems
b. Complete digestive systems
c. Tough, inflexible exoskeletons
d. Complete respiratory systems
a. Poorly developed excretory systems
Flatworms and Nematodes have poorly developed excretory systems.
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A pitcher throws a baseball by lowering the forearm to straighten the arm. During this movement, the biceps muscle ________ and the triceps muscle ________
A) contracts; relaxes B) relaxes; contracts C) relaxes; relaxes D) contracts; contracts
Signal-recognition particle RNA is involved in directing the ribosome-mRNA-polypeptide complex to the rough ER
__________________ Indicate whether the statement is true or false.
The plant phase that produces gametes is called
A. Sporophyte B. Zygote C. Gametophyte D. Spore
Cells can be large if they
A. are metabolically very active. B. have metabolically inactive central regions. C. actively pump nutrients into the cell. D. have a very small surface area compared to their volume.