Topic 1.2 Elements of Life

Which of the following molecules has the fewest characteristics of an organic molecule?

• water

• methane

• keratin–fibrous protein forming the main structure of hair

• hemoglobin–iron-containing oxygen transport metalloprotein

Which of the following characteristics is responsible for the complexity and variety of organic molecules?

• the chemical versatility of carbon atoms

• the variety of rare elements in organic molecules

• the diverse bonding patterns of nitrogen

• their interaction with water

Differences in which of the following chemical characteristics are responsible for the uniqueness of individuals organisms?

• elemental composition from organism to organism

• types and relative amounts of organic molecules synthesized by each organism

• sizes of the organic molecules in each organism

• types of inorganic compounds present in each organism

Tags

NGSS.HS-LS1-6

NGSS.HS-LS2-5

Which of the following explains why the valency of carbon is 4 even though it has 6 electrons?

• donates its 2 electrons to another atom

• shares its 2 electrons and bonds with another atom

• has 4 electrons in its first shell and 2 in the second shell

• has 2 electrons in its first shell and 4 in the second shell

Tags

NGSS.HS-PS1-1

The maximum number of hydrogen atoms in an alkane with six carbons is ________.

• 6

• 10

• 12

• 14

Which of the following is not analogous to a biological polymer?

• a train

• a pearl strand necklace

• an iron chain

• a truck

How many molecules of water are required for the polymerization of a 22 monomer-long cellulose molecule?

• 11

• 21

• 22

• 44

The molecular formula of a carbohydrate molecule is C24H42O21. The maximum number of glucose and water molecules that will be consumed by complete hydrolysis of the carbohydrate is ________.

• 6 molecules of glucose and 3 molecules of water

• 4 molecules of glucose and 4 molecules of water

• 4 molecules of glucose and 3 molecules of water

• 6 molecules of glucose and 5 molecules of water

Tags

NGSS.HS-LS1-6

The structural level of a protein least affected by a disruption in hydrogen bonding is the ________.

• primary level

• secondary level

• tertiary level

• quaternary level

Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?

• 5′-AGCT-3′ with 5′-TCGA-3′

• 5′-GCGC-3′ with 5′-TATA-3′

• 5′-ATGC-3′ with 5′-GCAT-3′

• All of these pairs are correct.