Which of the following does not rely on active transport to cross the cell membrane? A. calcium ions B. water molecules C. potassium ions D. sodium ions

What do sea jellies, earthworms and spiders have in common?

The graph illustrates the relative activity levels of three common digestive enzymes, where 0 represents no activity and 12 represents the highest level of activity. Which enzyme is most active at a neutral pH of 7?

14. Which of the following is NOT caused by a virus? a. Acquired immune deficiency syndrome b. Herpes C. Gonorrhoea d. Influenza (the flu)

What is the only jointless bone in the human body?

Decide if the following sentences are true or false. You have to correct the false ones. a) There are four kinds of coal depending on their carbon content. b) Coal is usually found in liquid state.

Which is not correct regarding nephrons? the renal corpuscle includes the glomerulus and the glomerular capsule. the renal tubule is composed of the proximal convoluted tubule, nephron loop, and distal convoluted tubule.

entify the plant phylum based on the description. A tree that can be found in the mountains and produces seeds in cones is a type of. A tree that produces blossoms that can be fertilized and develop into fruit is a type of.

The most significant difference between a paracrine and an autocrine is

What are produced in both the male and female reproductive systems in humans?

Describe three different types of cells in a sponge, including their functions.