Ten on Tuesday (Session #2)

Which of the following is an example of a molecule?

(66% accuracy)

• carbon

• DNA

• ER

• heart

You would not find this structure in prokaryotic cells...

(66% accuracy)

• cytoplasm

• DNA

• mitochondrion

• ribosome

How do enzymes speed up chemical reactions? Enzymes 

(55% accuracy)

• lower the activation energy of chemical reactions.

• raise the temperature of the cell, speeding chemical reactions.

• store ATP, allowing more energy to be used in chemical reactions.

• act as miniature "transfer trucks" which gather materials for chemical reactions and place them together.

The molecule pictured is a __________ .

(59% accuracy)

• amino acid

• carbohydrate

• lipid

• nucleic acid

Which of these is the correct equation for cellular respiration?

(69% accuracy)

• oxygen + glucose → water + carbon dioxide + energy

• carbon dioxide + glucose → water + oxygen + energy

• water + carbon dioxide + light energy → oxygen + glucose

• glucose + water + carbon dioxide → energy + oxygen

There are two main ways in which molecules are transported into and out of cells: active transport and passive transport. Which of the following is an example of active transport?

(49% accuracy)

• diffusion

• osmosis

• plasmolysis

• sodium-potassium pump

Which of the following types of passive transport involves water molecules moving from a high concentration to a low concentration?

(64% accuracy)

• facilitated diffusion

• filtration

• osmosis

• simple diffusion

The graph shows how the activity of an enzyme changes at different temperatures. Which statement best describes what happens to the enzyme when the temperature of the reaction increases to 63 degrees Celsius?

(32% accuracy)

• The enzyme is used up and the reaction stops.

• The enzyme begins to decrease the rate of the reaction.

• The enzyme continues to increase the rate of the reaction.

• The enzyme changes shape and can no longer speed up the reaction.

Which biological molecules are most likely represented by molecules 1 and 2?

(42% accuracy)

• molecule 1: lipid and molecule 2: nucleic acid

• molecule 1: carbohydrate and molecule 2: protein

• molecule 1: carbohydrate and molecule 2: nucleic acid

• molecule 1: carbohydrate and molecule 2: protein

The diagram shows two types of cell transport. Which pair of statements best compares the two types of cell transport?

(62% accuracy)

• Type 1 does not require energy and molecules move with their concentration gradient. Type 2 requires energy and molecules can move against their concentration gradient.

• Type 1 does not require energy and molecules can move against their concentration gradient. Type 2 requires energy and molecules move with their concentration gradient.

• Type 1 requires energy and molecules move with their concentration gradient. Type 2 requires energy and molecules can move against their concentration gradient.

• Type 1 does not require energy and molecules move with their concentration gradient. Type 2 does not require energy and molecules can move against their concentration gradient.