Dr. Smith reads two research papers that present different conclusions about the same question. He knows the researcher who wrote Paper A, but does not know the authors of Paper B. When asked which paper he thinks has more merit, Dr. Smith replies, "Paper A." Because of Dr. Smith's connection to some of the researchers, he could be exhibiting a. bias. b. inference. c. observation. d. skepticism.

• bias

• inference

• observation

• skepticism

Tamar is talking about evolution with a friend. The friend says, "It’s just a theory, so I don’t believe it. When they prove it and it becomes the law of evolution, then maybe I’ll change my mind." Which of these possible replies best describes scientific principles or the work of scientists?

• Scientific theories do not become scientific laws; they are explanations for natural phenomena based on evidence.

• Science always finds the right answer; the answers that scientists and researchers discover never change.

• He should be wary of science because it is based on research and evidence, not bias and opinion.

• Scientists take each other at their word regarding experimental results, and the public should, too.

Tags

NGSS.HS-LS4-1

Camille notices that the leaves of her pothos plant are drooping this morning. The leaves were not droopy yesterday. She decides the plant needs to be watered. What had Camille just done?

• calculated the probability of the plant’s ability to survive without water

• devised a controlled experiment about the effect of water on plant leaves

• formed a hypothesis based on quantitative data she has collected

• made an inference based on past experience and observation

Tags

NGSS.MS-LS2-1

In an experiment, what is the role of a control group?

• To test the new variable

• To serve as a comparison

• To introduce a new factor

• To change the outcome.

Fill in the blank: Starch is a polymer made of _______.

• proteins

• glucose monomers

• nucleic acids

• lipids

In a chemical reaction, which event ALWAYS occurs as the reaction proceeds?

• the rearrangement of electrons to break or form chemical bonds

• the release of energy to the environment

• the absorption of energy from the environment

• a change in total mass

Tags

NGSS.HS-PS1-4

What is the effect of an enzyme on the energy of a chemical reaction?

• Enzymes increase the free energy of the products.

• Enzymes decrease the free energy of the reactants.

• Enzymes decrease the difference in energy between products and reactants.

• Enzymes decrease the activation energy of the reaction.

Tags

NGSS.HS-PS1-4

Which type of macromolecule has the function of storing and transmitting hereditary or genetic information?

• lipid

• carbohydrate

• nucleic acid

• protein

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which describes a eukaryotic cell, but not a prokaryotic cell?

• uses DNA to control cell activities

• is surrounded by a cell membrane

• makes and uses proteins

• contains DNA in a nucleus

Josey wants to look at the cells of an onion under a light microscope. She peels off a thin, transparent layer of onion and places it on a microscope slide. Josey places the sample on the microscope stage, looks through the eyepiece, and adjusts the stage to focus the image. However, she is unable to see any details of the cells. Which of the following solutions will best enable Josey to see the onion cells in detail?

• a. Josey should use a thicker piece of onion for her sample.

• b. Josey should place her onion sample in a vacuum.

• c. Josey should place a drop of water on her sample.

• d. Josey should apply a stain, such as iodine, to her sample.