All cells are surrounded by a membrane.

Which sentence states a characteristic of a cell membrane?

1) It is rigid.

2) It is semipermeable.

3) It is weak.

4) It is square.

The PCR technique doubles the amount of DNA in a sample in each cycle. If you started the PCR technique with two fragments of double-stranded DNA, calculate how many double-stranded DNA fragments you would you have after four cycles.

Some fungi are able to reproduce both sexually and asexually. Which of the following describes a consequence that would most likely occur if fungi undergo only sexual reproduction for a long period of time? (1

All of the following are environmental factors that affect human development except a. Chromosomes b. Healthy eating habits c. Economics d. Living conditions

If two squirrels live in one square m of 50 square m park what is the park's estimated squirrel population?

A devastating tsunami wipes out most of the population of a frog species that lives on just one tropical island. what is the most likely outcome of this event?

The neurology consult report includes the following statement: "Client's diet is notable for moderate amounts of aspartame and no significant glutamate." What are aspartame and glutamate?

Why are fats important to organisms?

What are the four types of biomolecules?

Plants appear green because they do not absorb the green wavelengths of light what happens to those green light waves when they hit the plant

The geographical processes that shape earths features today