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Alexxx [7]
3 years ago
12

Which of the following statements is true for a cell placed in beaker containing an isotonic solution?

Biology
2 answers:
loris [4]3 years ago
6 0
<span>The correct answer is C. W</span><span>ater molecules go in both directions at the same rate/speed.</span>
Alex3 years ago
5 0

Answer:

C. Water molecules flow in both directions at the same rate.

Explanation:

The relative concentration of solutions indicates the direction of movement of water across the semi-permeable membrane. An isotonic solution is that which has the same osmolarity of a cell. As a result, there is no concentration gradient for water across the cell membrane. In this case, water molecules will move through the plasma membrane in both directions with the same rate. Thus, there will be no net movement of water into or out of the cell.

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How does sexual reproduction most benefit species
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Imagine a microbial cell that normally carries out aerobic respiration has encountered a low oxygen environment and may die if t
weeeeeb [17]

Answer:

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7 0
3 years ago
increasing intracellular cAMP leads to smooth muscle relaxation by: Group of answer choices inhibiting IP3 channels, leading to
kirza4 [7]

Answer:

1. Inhibiting IP3 channels, leading to decreased Ca2 in the sarcoplasm and reduced contraction.  

2. Increasing the relative activity of MLCP, leading to a decrease in tension.

3. Activating K channels, increasing K leaking out of the cell which hyperpolarizes it and decreases the likelihood of Ca2 entry.

Explanation

In smooth muscle, cyclic AMP (cAMP) mediates relaxation because cAMP inhibits a specific kinase required for myosin light chain protein (MLCP) phosphorylation, thereby triggering contraction in the smooth muscles. It has been shown that cAMP inhibits 1,4,5-trisphosphate (IP3)-dependent calcium ions (Ca 2+) release by activation of the cGMP-dependent protein kinase (PKG). PKG proteins act to modulate Ca2+ oscillations by stimulating sarcoplasmic Ca2+-ATPase membrane proteins, increasing Ca2+ in the sarcoplasmic reticulum stores and Ca2+ efflux from the cells, and activate voltage-gated potassium (K) channels, thereby leading to membrane hyperpolarization and reducing Ca2+ entry through Ca2+ channels.

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C because the moon has less mass than Earth the Gravitational Force is less and thus anything on the moon weighs less than on Earth
7 0
3 years ago
Read 2 more answers
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