Ten on Tuesday (Session #1)

How would you classify a cell with the following features: nucleoid, cytoplasm, and plasma membrane?

(32% accurate)

• animal cell

• eukaryotic cell

• plant cell

• prokaryotic cell

Are viruses alive? The scientific debate continues. Viruses exhibit some characteristics of life, but others are missing. 
The MOST obvious reason why scientists still refer to viruses as non-living is that they...

(45% accurate)

• are much smaller than anything alive.

• are not composed of one or more cells.

• do not change over time.

• do not contain any genetic material.

Which bond of the ATP molecule is broken in order to release energy?

(53% accurate)

• A

• B

• C

• D

Which structures shown in the figure make up the ADP molecule?

(60% accurate)

• A and B

• C and D

• A, B, and C

• A, B, C, and D

The chart shows some properties of the element carbon. Which property is most responsible for carbon’s ability to form complex biological macromolecules?

(31% accurate)

• number of neutrons

• number of protons

• number of electrons

• atomic masses of stable isotopes

Which enzyme would most likely reach its maximum reaction rate in pure water?

(37% accurate)

• Enzyme W

• Enzyme X

• Enzyme Y

• Enzyme Z

Alveoli are microscopic air sacs in the lungs of mammals. Which statement best describes how the structure of the alveoli allows the lungs to function properly?

(23% accurate)

• They increase the amount of energy transferred from the lungs to the blood.

• They increase the flexibility of the lungs as they expand during inhalation.

• They increase the surface area of the lungs, allowing efficient gas exchange.

• They increase the volume of the lungs, allowing more oxygen to be inhaled.

Lipase is an enzyme that breaks down lipids in the digestive system of humans. It functions best at a pH range of 4.0 to 5.0. When a person takes an antacid tablet to relieve heartburn, the antacid increases the pH to around 7 in certain areas of the digestive system. Which initial effect would most likely be caused by a change in pH?

(27% accurate)

• More lipids would be digested.

• Fewer lipids would be digested.

• The production of lipase molecules would increase. 

• The production of lipase molecules would decrease.

Which statement best compares the energy transformations of photosynthesis and cellular respiration?

(39% accurate)

• Only photosynthesis uses oxygen to create energy.

• Only photosynthesis causes an increase in kinetic energy.

• Photosynthesis and cellular respiration both store energy in chemical bonds.

• Photosynthesis and cellular respiration both require chemical energy to make food.

A scientist observed that during the course of a chemical reaction the number of ATP molecules was reduced. What did the scientist most likely learn from the observation?

(54% accurate)

• The reaction produced water.

• The reaction consumed water.

• The reaction caused an output of energy.

• The reaction required an input of energy.