Q: Which of the following statements about the equivalence of units is correct?

$$1\ \text{nm} = 10$$^{-6}$$\ \text{mm}$$

Question 1

Which of the following statements about the equivalence of units is correct?

Accepted Answer

$$1\ 	ext{nm} = 10$$^{-6}$$\ 	ext{mm}$$

Question 2

A scientist wants to precisely visualize the location of a protein in a living cell. Which microscopic technique should they use?

Accepted Answer

Confocal microscopy with a fluorescently tagged protein

Question 3

Sweating helps an athlete cool down because water:

Accepted Answer

Requires a lot of heat from the athlete’s body in order to evaporate

Question 4

An unusual form of life contains a fourth type of macromolecule, which is a long polymer. What is most likely true about this chemical?

Accepted Answer

It would be produced by dehydration synthesis

Question 5

Peptidoglycan in some species contains D-alanine. How are D-alanine and L-alanine alike?

Accepted Answer

All of the above are correct

Question 6

Barley cells synthesize maltose whereas mammary cells synthesize lactose. What is the best explanation for this difference?

Accepted Answer

Barley cells contain a gene that itself encodes an enzyme that catalyzes the synthesis of maltose

Question 7

Why are carbohydrates more hydrophilic than lipids?

Accepted Answer

Carbohydrates have more polar O—H bonds per molecule

Question 8

Which of the following includes material from more than one kind of macromolecule?

Accepted Answer

Glycolipids

Question 9

Eukaryotic cells may cope with surface area issues that limit their size and function by:

Accepted Answer

All of the answers are correct

Question 10

To be useful to scientists, a hypothesis must be:

Accepted Answer

Falsifiable

Question 11

Which scientist synthesized urea in the laboratory from inorganic starting materials, marking the beginning of modern biochemistry?

Accepted Answer

Friedrich Wöhler

Question 12

Melvin Calvin used radioactive carbon ($$^{14}	ext{C}$$), a specific isotope, to deduce the Calvin-Benson cycle of photosynthesis. What property of $$^{14}	ext{C}$$ made it useful for this purpose?

Accepted Answer

It is a radioactive tracer that can be detected in metabolic pathways

Question 13

Which instrument, developed by Svedberg in Sweden during 1925–1930, is used to separate subcellular structures and macromolecules based on size, shape, and density?

Accepted Answer

Ultracentrifuge

Question 14

A cell biologist wishes to visualize the ribosomes of a cell. Which microscope would be most advantageous for this purpose?

Accepted Answer

Transmission electron microscope (TEM)

Question 15

Which scientist is best known for the concept of 'hereditary factors' in genetics?

Accepted Answer

Gregor Mendel

Question 16

Which functional group is important in hydrogen bonding and is commonly found in carbohydrates?

Accepted Answer

Hydroxyl group

Question 17

The cell membrane is composed of a phospholipid bilayer. This molecule has regions that are polar and nonpolar and is therefore:

Accepted Answer

Amphipathic

Question 18

Which property of water is responsible for insects such as water striders being able to move across its surface?

Accepted Answer

Surface tension (cohesion)

Question 19

Which of the following is a structural polysaccharide?

Accepted Answer

Cellulose

Question 20

Which of the following statements about the directionality of protein synthesis is correct?

Accepted Answer

Proteins are synthesized from the N (amino) end to the C (carboxyl) end

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