Science

nutrient pollution causes algal blooms and fish kills.

question 2 options:
true
false
save
question 3 (1 point) question 3 unsaved
in normal ecosystem low nutrient levels keep algae in check.

question 3 options:
true
false
save
question 4 (2 points) question 4 unsaved
which of the following contributes to excess nutrients entering the bay?

question 4 options:

sewage run-off

not recycling

agricultural run-off

air pollution

save
question 5 (2 points) question 5 unsaved
in order to get phase 2 to turn blue (like we saw in phase 1), did we need more or less drops of reagent d than what we used in phase 1?

question 5 options:

more

less

save
question 6 (2 points) question 6 unsaved
which stage of of the experiment had the most dissolved oxygen in the water?

question 6 options:

phase 1

phase 2

phase 3

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).