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

Biology & Microbiology

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A DNA molecule containing 32% thymine would contain how much cytosine?  

A.  18% B.  32% C.  36% D.  64%

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Restriction enzymes recognize and cut DNA at specific nucleotide sequences. Indicate whether the statement is true or false

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Why do free-living bacteria, such as Escherichia coli with 4000 genes, have more genes than intracellular bacteria?

What will be an ideal response?

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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.

Biology & Microbiology