Which feature of a cell membrane determines whether molecules can cross the membrane?

A shopping mall was recently built near Mary's neighborhood. Soon Mary began to notice fewer birds at her bird feeder. What can Mary infer?

An element has an atomic mass number of 16 and an atomic number of 7. The element has protons and neutrons.

Which of the following is an inorganic compound? Option (A) sugar Option (B) common salt Option (C) kerosene Option (D) alcohol

How do you think your reaction to the bug would change if the myelin on your neurons was damaged or destroyed?

Which is a reservoir for nitrogen? A. lightning B. biomass C. nitrogen gas D. ammonium E. nitrogen-fixing bacteria

Which structure is an example of a hinge joint?

Shivering and sweating are two techniques that mammals use to a) adapt to the temperature b) develop a rise in body temperature C) maintain homeostasis d) use excess energy

During the process of cellular respiration, energy is released from (1) carbon dioxide (3) water molecules (2) oxygen atoms (4) chemical bonds

Protist get energy by

10. What is a genotype? A an organism's combination of genes for a trait B an organism's appearance as a result of its genes C the ratio of dominant to recessive genes in an individual D the collection of dominant genes in an organism