Describe the characteristics of the Phylum Platyhelminthes. Check all that apply.
A. They exchange respiratory gases through the body wall.
B. They have a complete digestive system.
C. They are acoelomate.
D. They are triploblastic.
Answer: D
You might also like to view...
A DNA molecule containing 32% thymine would contain how much cytosine?
A. 18% B. 32% C. 36% D. 64%
Restriction enzymes recognize and cut DNA at specific nucleotide sequences. Indicate whether the statement is true or false
Why do free-living bacteria, such as Escherichia coli with 4000 genes, have more genes than intracellular bacteria?
What will be an ideal response?
Which of the following statements correctly describe(s) T tubules and their role in conducting action potentials in muscle cells?
A. T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na+ and K+ channels. B. T tubules lack the voltage-gated Na+ and K+ channels that are present in the plasma membrane. C. T tubules are infoldings of the plasma membrane that encircle the myofibrils and are in contact with the sarcoplasmic reticulum. D. Without T tubules, the muscle cell would not be able to contract. E. T tubules are extensions of the sarcoplasmic reticulum that are in contact with the plasma membrane. F. T tubules have receptor proteins that bind neurotransmitters released from the synaptic terminal of the motor neuron.