What is meant by the following statement about the cell membrane? The cell membrane is said to be semipermeable.

Why might introduction of exotic species disrupt an ecosystem? A. They're struggling to survive and can be disruptive. B. They die quickly and overfeed scavengers. C. There are very few of the organisms present. D. They can outcompete native species.

What enzyme breaks apart lactose? What reaction is it called?

Which is used in selective breeding? a.) natural selection b.) artificial selection c.) survival of the fittest d.) overproduction of offspring

A person who is gaining weight but lacking in some vitamins exhibits

An embryologist is looking at a cross-section of a mouse embryo. She notices that flanking either side of the neural tube (the rudiment of the spinal chord) are eggplant-shaped structures that contain many cell bodies.

Maryland white oak trees make their own food. Their cells contain structures that capture energy from the sun. What are these structures?

What are two ways in which all living things are similar at the molecular level.

Which of the labeled structures controls the water balance in the paramecium?

Paleontologists can definitively conclude whether dinosaurs were endotherms. a. True b. False

What is thethe protein-assembly factories of the cell, are present in prokaryotic cells, animal cells, and plant cells.