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Questions in biology

[Free] Which of the following best describes the function of the organelle labeled 'D'? (a) Moves substances across the cell membrane (b) Transports materials around the cell (c) Controls all cell activities (d) Packages materials for export from the cell

[Free] What is the meaning of the term "virus"?

[Free] A student investigated how the pressure in a diving pool varied with depth. He filled a balloon with helium and tied it to the end of a long pole. Then, he submerged the balloon to various depths and observed the result. Which one of the following best describes what happened to the balloon as it went deeper? (a) The balloon got larger because the pressure of the water around it increased compared with the pressure inside the balloon. (b) The balloon got larger because the pressure of the water around it decreased compared with the pressure inside the balloon. (c) The balloon got smaller because the pressure of the water around it increased compared with the pressure inside the balloon. (d) The balloon got smaller because the pressure of the water around it decreased compared with the pressure inside the balloon.

[Free] Can you tell me what a cockle is?

[Free] An eruption is classified as an explosive volcanic eruption based on the amount of which mineral found in the magma?

[Free] Alzheimer’s and Parkinson’s are both diseases affecting the central nervous system, and they share some similar characteristics. Which of the following is only true for Alzheimer’s disease? A. Patients suffer from the degeneration of nerve cells in the brain. B. Symptoms can be treated with medications that increase acetylcholine in the brain. C. It mostly affects people over the age of 55 and presently has no cure. D. Patients lack a neurotransmitter essential for normal brain functioning.

[Free] What is a bog?

[Free] A lack of Vitamin D is said to be detrimental to the maintenance of bone density. If a scientist wanted to determine whether this view was supported by scientific evidence, which of the following would be the best method of doing so? A. Carry out a survey of people with normal bone density to find out whether they take Vitamin D tablets or not. B. Compare the bone density of two groups of people with low bone density after providing only one of the groups with Vitamin D. C. Compare the incidence of people with low bone density in two different populations. D. Carry out an experiment in which a group of people with normal bone density are exposed to very little sunlight to prevent the production of Vitamin D.

[Free] Can you tell me what seagrass is?

[Free] What is a cold-blood horse?