A sea star suffers from an infection that affects its ampullae. Due to the infection, the ampullae no longer function. What do you predict will be the effect on the sea star?
A. No noticeable effect will occur.
B. The sea star will be unable to reproduce.
C. The sea star will be unable to extend its tube feet.
D. The sea star will be unable to store energy.
C. The sea star will be unable to extend its tube feet.
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In what portion of the plant does photosynthesis takes place?
A. mesophyll B. chloroplast C. thylakoid membrane D. grana E. All of the choices are correct.
The electrical stimulus for each human heartbeat begins in the
A. right atrium at the sinoatrial node. B. left atrium at the sinoatrial node. C. right atrium at the atrioventricular node. D. right ventricle at the atrioventricular node. E. pulmonary trunk at the sinoatrial node.
To test for the presence of starch, iodine can be used. A positive reaction results in a black color. A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution. After 30 minutes the dialysis bag appears black. Based on this information, what most accurately describes what happened?
A. Over time, both iodine and starch are equally distributed throughout the two solutions. B. Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution. C. Due to its size and polarity, iodine was able to enter the dialysis bag and interact with starch.
Which soil region tends to accumulate mineral ions but relatively little organic matter, and is generally penetrated by mature tree roots?
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon