topic 2

Information can be sent from

• cell A to cell B because cell B is able to recognize signal 1

• cell A to cell B because cell A is able to recognize signal 2

• cell B to cell A because cell A is able to recognize signal 1

• cell B to cell A because cell B is able to recognize signal 2

Which statement concerning proteins is not correct?

• Proteins are long, usually folded, chains.

• The shape of a protein molecule determines its function.

• Proteins can be broken down and used for energy.

• Proteins are bonded together, resulting in simple sugars.

All cells of an organism are engaged in many different chemical reactions. This fact is best supported by the presence in each cell of thousands of different kinds of

• enzymes

• nuclei

• chloroplasts

• organelles

Tags

NGSS.HS-LS2-3

Vaccinations help prepare the body to fight invasions of a specific pathogen by

• inhibiting antigen production

• stimulating antibody production

• inhibiting white blood cell production

• stimulating red blood cell production

  Hint

Tags

NGSS.HS-LS1-3

The photograph below shows a microscopic view of the lower surface of a leaf.

What is the main function of the cells indicated by the black pointer?

• regulate the rate of gas exchange

• store food for winter dormancy

• undergo mitotic cell division

• give support to the veins in the leaf

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

A researcher needs information on antigen–antibody reactions. Searching for which phrase would best lead the researcher to information about these reactions?

• protein synthesis

• energy sources in nature

• white blood cell activity

• DNA replication

Scientific studies have indicated that there is a higher percentage of allergies in babies fed formula containing cow’s milk than in breast-fed babies. Which statement represents a valid inference made from these studies?

• Milk from cows causes allergic reactions in all infants.

• Breast feeding prevents all allergies from occurring.

• There is no relationship between drinking cow’s milk and having allergies.

• Breast milk most likely contains fewer substances that trigger allergies.

Which statement describes all enzymes?

• They control the transport of materials.

• They provide energy for chemical reactions.

• They affect the rate of chemical reactions.

• They absorb oxygen from the environment.

Tags

NGSS.HS-PS1-2

Which statement best describes cellular respiration?

• It occurs in animal cells but not in plant cells.

• It converts energy in food into a more usable form.

• It uses carbon dioxide and produces oxygen.

• It stores energy in food molecules.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS1-7

Enzymes have an optimum temperature at which they work best. Temperatures above and below this optimum will decrease enzyme activity. Which graph best illustrates the effect of temperature on enzyme activity?

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