The Earth is populated mostly by single-celled organisms, such as bacteria. However, there are many multi-celled organisms as well.

Which of the following is a multi-celled organism?

A.

flower

B.

human

C.

insect

D.

all of these

What similarities and differences do you see between the bacteria and the human cells? Are these cells prokaryotes or eukaryotes?

Which of the following statements is true? Friction works in the direction opposite of motion. Lubrication can be used to increase friction. Only large masses exert gravitational force. Air resistance is greatest for objects with small surface areas.

An E. coli culture that has been growing at 37°C is moved to 25°C. Which of the following changes must be made in its plasma membrane? a. The viscosity must increase. b. The number of saturated chains must increase. c.

Harry is hospitalized with bacterial pneumonia. When you visit him, his teeth are chattering, his skin is cool and clammy to the touch, and he complains of feeling cold even though his room is quite warm. Explain his symptoms.

A common inhabitant of human intestines is the bacterium Escherichia coli. A cell of this bacterium in a nutrient-broth medium divides into two cells every 20 minutes. The initial population of a culture is 63 cells.

What will happen if our kidney stops working?

Amphibians have internal fertilization that requires the presence of water. true or false

Nearly all organisms on earth carry out some form of glycolysis. How does that fact support or not support the assertion that glycolysis is one of the oldest metabolic pathways?

Gender is determined by X's and Y's. Which of the following is the code for a male?

What tells a ribosome to start making a protein