Question 1

Which of the following best describes the difference between a hypothesis and a theory in scientific methodology?

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-substantiated explanation supported by a large body of evidence.

Question 2

A researcher is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. She measures plant height after four weeks. Which type of experiment is this?

Accepted Answer

Controlled experiment

Question 3

Which of the following statements about statistical significance is correct?

Accepted Answer

Statistical significance indicates that the observed results are unlikely to have occurred by chance, typically when $$p \u003c 0.05.$$

Question 4

Which of the following is NOT a characteristic shared by all living organisms?

Accepted Answer

Ability to photosynthesize

Question 5

Which of the following best describes the difference between microevolution and macroevolution?

Accepted Answer

Microevolution involves changes in allele frequencies within a population, while macroevolution involves large-scale changes that can result in new species.

Question 6

Which of the following is an example of an organic molecule?

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 7

Which property of water allows it to moderate Earth's climate by absorbing and releasing heat slowly?

Accepted Answer

High specific heat

Question 8

Which of the following pairs are structural isomers?

Accepted Answer

Butane and isobutane

Question 9

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 10

Which type of reaction is responsible for joining two monosaccharides to form a disaccharide?

Accepted Answer

Dehydration synthesis

Question 11

Which of the following is a correct pairing of a macromolecule with its building block?

Accepted Answer

Protein – amino acid

Question 12

Which level of protein structure is determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 13

A patient is diagnosed with sickle cell anemia, a disease caused by a single amino acid substitution in hemoglobin. This mutation affects which level of protein structure first?

Accepted Answer

Primary structure

Question 14

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 15

Which organelle is responsible for producing ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 16

A scientist is studying a cell that contains a nucleus, mitochondria, and chloroplasts. Which type of organism is this cell most likely from?

Accepted Answer

Plant

Question 17

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water is polar, allowing it to dissolve ionic and other polar substances.

Question 18

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

They synthesize proteins by linking amino acids together.

Question 19

A biologist observes that a certain cell type can survive in extreme environments, lacks a nucleus, and has circular DNA. Which domain does this organism most likely belong to?

Accepted Answer

Archaea

Question 20

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Ice is less dense than liquid water due to the hydrogen bonding that forms a crystalline structure.

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