19. Which structure is the boundary between a living cell and its environment?

a. Cell membrane

b. Cytoplasm

C. Vacuole

d. Ribosome

Scientists have successfully transformed bacteria with human genes. Describe one current use of the technology in medicine.

Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space.

Which nutrient provides the highest number of calories per gram? fat sugar carbohydrate protein

Would all of the reptiles in an area be considered a population? Explain.

Invasive species outcompete native species because they lack predators and have high reproductive rates. True or False?

Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. After the system reaches equilibrium, what changes are observed?

How has human activity impacted the evolution of the peppered moth?

Which feature of sugarcanes suggests that they are stems? The presence of scaly leaves and axillary buds A high quantity of sugar The development of adventitious roots

How was the wildlife affected by hurricane sandy in 2012

What is the difference between a leading and lagging strand?