A 200 - gram sample of a radioactive nuclide is left to decay for 30 hours. At the end of 30 hours only a 100 g of the sample is left. What is the half life of the nuclide sample

How is DNA prepared for cell division?

The permeability of a biological membrane to a specific polar solute may depend on which of the following? A. the amount of cholesterol in the membraneB. the types of transport proteins in the membraneC. the phospholipid composition of the membraneD.

Which organism is not a predator? A. a spider B. a mountain lion C. a hyena D. a squirrel

Which of the following is the SI unit used to measure mass? a. kilogram b. liter c. meter d. Kelvin

Prokaryotes are different from all other organisms in that their cells A. lack DNA. B. lack nuclei. C. have cell walls. D. have organelles.

If element X has 76 protons, how many electrons does it have

Match each description with the correct division of the peripheral nervous system. somatic nervous system regulates voluntary activities parasympathetic nervous system regulates involuntary activities sympathetic nervous system called the rest and

Which of the following diseases is caused by a spirochete? tularemia relapsing fever rheumatic fever Rocky Mountain spotted fever

The brain of the nervous system and the endocrine glands of the endocrine system are similar to one another in certain ways. Both act to send messages to distant body parts. What is a significant difference of the activity of endocrine glands? A.

After reviewing the process of meiosis describe how an error during meiosis could lead to polyploidy