regents practice

As a human red blood cell matures, it loses its nuclei. As a result of this loss, which process would be impossible for mature red blood cells to carry out

Reproduction. The nucleus contains the DNA. No nucleus means no DNA which means the cell cannot replicate itself.

An ameba is a single-celled, heterotrophic organism. In order to meet its energy needs, it relies directly on the interaction of which cell structures?

The food is converted into ATP inside the mitochondria which provides energy to amoeba for the proper functioning. The answer is cell membrane and mitochondria

identify which type of chemical substance a scientist would need to cut and paste the genes to produce genetically modified tomato plants

an enzyme

Which cell structure plays a direct role in the release of this chemical from the cell

cell membrane

Single-celled organisms are able to maintain homeostasis, even though they lack higher levels of organization such as organs and organ systems, because

cell structures work together to maintain homeostasis in single-celled organisms

Which system in a multicellular organism functions most like the cytoplasm in a single- celled organism?

circulatory

Fat molecules typically contain long chains of carbon atoms. Animals tend to store fats for use when food resources are scarce. This is an advantage to the animal because

much energy can be gained by breaking the bonds between atoms in the fats

When humans place grass clippings and other yard waste in landfills, they are most directly interfering with the natural process of

recycling organic compounds

In a single-celled organisms materials are stored primarily in

ribosomes

To clone a mammal, a cloned embryo is often put into an adult female of the same species to continue internal development. The structure in which the embryo will develop is the

uterus