Biology Q 1

1.

1 point

Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration?

104 M

10−4 M

4%

4.0 M

2.

1 point

Which of the following statements concerning unsaturated fats is correct?

They are more common in animals than in plants

They contain more hydrogen than saturated fats having the same number of carbon atoms.

They have double bonds in the carbon chains of their fatty acids.

They generally solidify at room temperature.

3.

1 point

A covalent chemical bond is one in which

an electron occupies a hybrid orbital located between the nuclei of two atoms

) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms

protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms

electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged

4.

1 point

A compound contains hydroxyl groups as its predominant functional group. Which of the following statements is true concerning this compound?

It won't form hydrogen bonds with water.

It is hydrophobic

It lacks an asymmetric carbon, and it is probably a fat or lipid.

It should dissolve in water.

5.

1 point

Which of these is reflective of the hierarchical organization of life from most to least inclusive?

phylum, class, order, kingdom, family, genus, species

class, order, kingdom, phylum, family, genus, species

genus, species, kingdom, phylum, class, order, family

kingdom, phylum, class, order, family, genus, species

6.

1 point

A localized group of organisms that belong to the same species is called a

population

family

biosystem

community

7.

1 point

Which type of bond must be broken for water to vaporize?

8.

1 point

Why is each element unique and different from other elements with respect to its chemical properties?

Each element has a unique number of protons

Each element has a unique number of neutrons.

Each element has a unique atomic mass.

Each element has different radioactive properties

9.

1 point

Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified?______________________

10.

1 point

Which of the following is true of both starch and cellulose?

They are both polymers of glucose

They are cis-trans isomers of each other.

They are both used for energy storage in plants.

They are both structural components of the plant cell wall

11.

1 point

What is a fat or triacylglycerol?

a protein with tertiary structure

a lipid made of three fatty acids and glycerol

a molecule formed from three alcohols

a kind of lipid that makes up much of the plasma membrane

12.

1 point

3H2 + N2⇔ 2NH3
Which of the following is true for the above reaction?

Ammonia is being formed and decomposed

Concentrations of reactants are higher than those of products

Hydrogen and nitrogen are being decomposed.

Acid is being formed

13.

1 point

If the pH of a solution is decreased from 9 to 8, it means that the

concentration of OH- has increased tenfold (10X) compared to what it was at pH 9

concentration of H+ has increased tenfold (10X) and the concentration of OH- has decreased to one-tenth (1/10) what they were at pH 9

concentration of H+ has increased tenfold (10X) compared to what it was at pH 9

concentration of OH- has decreased to one-tenth (1/10) what it was at pH 9

14.

1 point

To understand the chemical basis of inheritance, we must understand the molecular structure of DNA. This is an example of the application of which concept to the study of biology?

reductionism

feedback regulation

emergent properties

the cell theory

15.

1 point

When applying the process of science, which of these is tested

a conclusion

a hypothesis

a control group

an observation

16.

1 point

Which of the following is an example of hydrolysis?

the synthesis of two amino acids, forming a peptide with the release of water

the synthesis of a nucleotide from a phosphate, a pentose sugar, and a nitrogenous base with the production of a molecule of water

the reaction of a fat, forming glycerol and fatty acids with the consumption of water

the reaction of a fat, forming glycerol and fatty acids with the release of water

17.

1 point

Why are hydrocarbons insoluble in water?

18.

1 point

Energy enters most ecosystems as

light

chemical energy

light and chemical energy

heat

19.

1 point

Which of the following statements is true about buffer solutions?

They maintain a constant pH when acids are added to them but not when bases are added to them

They maintain a relatively constant pH of approximately 7 when either acids or bases are added to them

They maintain a relatively constant pH when either acids or bases are added to them

They are found only in living systems and biological fluids

20.

1 point

The element present in all organic molecules is _________________________

21.

1 point

An atom has 6 electrons in its outer shell. How many unpaired electrons does it have?

22.

1 point

Which of the following is not a monomer/polymer pairing?

amino acid/protein

deoxyribonucleotide/DNA

triglyceride/phospholipid bilayer

monosaccharide/polysaccharide