Which of the following molecules can cross the lipid bilayer of a membrane directly, without a transport protein or other mechanism? Select all that apply.

water

ions

proteins

oxygen

carbon dioxide

lipids

sucrose

What is the structure most responsible for maintaining cell homeostasis?

A has receptors that allow it to respond to a particular hormone in a specific way. Fill in the blank

Which element has the greatest number of protons

Describe three events that you cannot explain

What is your preliminary idea (s) of the species of bacteria responsible for anna's infection?

Sample Response: The sound of the drumstick hitting the metal bar will get to me in a shorter amount of time in Scenario 1.

A sedimentary rock containing a fern fossil was found. What does this tell about the area at the time the rock was formed? The area was hot. The area was covered by an ocean. The area was on land. The area was cold.

1. Which of the following statements best describe the difference between angiosperms and gymnosperms? A. Angiosperms produce cones to protect their seeds; gymnosperm seeds are surrounded by fruit. B.

If DNA polymerase is observed to pause as it is synthesizing genetic material from a template strand, this is likely the result of: (A) DNA polymerase encountering a "bulky lesion" on the template strand.

Do all social hazards result from an individuals lifestyle choice? Explain