Answer:
1. The plasma membrane allows some substances to enter or leave a cell more easily than others.
Explanation:
The plasma membrane is selectively permeable membrane that surrounds the cell cytoplasm and organelle of cell. The plasma membrane is selectively permeable because it allows some substance to pass through it more easily by simple diffusion and some substance through carrier and channel proteins.
The plasma membrane allows selective molecules to pass through it. Small and lipophilic molecules can cross the membrane by diffusion but large and ionic molecules require transport proteins. Some transport proteins need ATP energy to transport molecules across the membrane. Therefore the right answer is 1.
Answer:
Yeah, you could get to it, but it would take a while, and you'd be subjecting yourself to thorns, ticks, snakes and about ten miles of the roughest country you can imagine.
Explanation:
<span>The statement, 'exposure to alcohol affects the blood supply to the foetus and can cause physical deformities to the face, eyes and heart', is true. Since the foetus is nourished through the blood of the mother, the alcohol in the mother's blood is also made available to the unborn baby through the placenta. This affects the baby health negatively and can cause deformities to the baby's face and heart.</span>
Nutrient-dense foods are rich in nutrients relative to their calorie content. These include various healthy foods such as whole vegetables, fruits, cocoa, seafood, eggs and liver.
