What type of bond would you expect to form between carbon and hydrogen atoms?

nonpolar covalent bond because carbon and hydrogen have equal electronegativities

nonpolar covalent bond because carbon and hydrogen have unequal electronegativities

polar covalent bond because carbon and hydrogen have unequal electronegativities

polar covalent bond because carbon and hydrogen have equal electronegativities

Which component of amino acid structure varies among different amino acids?

the presence of a central C atom

the long carbon-hydrogen tails of the molecule

Which of the amino acids below are hydrophobic and therefore will not readily dissolve in water?

none of the above; all are hydrophilic

Which of the following best summarizes the relationship between condensation reactions and hydrolysis?

condensation reactions build polymers, while hydrolysis breaks polymers apart

water is released during hydrolysis, while a condensation reaction consumes water

hydrolysis creates polymers, while condensation reactions create monomers

both condensation reactions and hydrolysis build polymers from monomers

The antiparallel strand of DNA are held together in a double helix by which of the following?

hydrogen bonds between nitrogenous bases

covalent bonds between nitrogenous bases

phosphodiester linkages between sugars

peptide bonds between the phosphate backbone

A competitive inhibitor decreases the rate of an enzyme by _____.

binding at the active site of the enzyme

changing the shape of the enzyme's active site by binding elsewhere on the enzyme

decreasing the activation energy of the reaction

Which of the following best describes the relationship between RNA and DNA? Choose all that apply.

RNA is generally single-stranded; DNA is double-stranded

both RNA and DNA contain adenine, guanine, and cytosine

RNA contains deoxyribose; DNA contains ribose

RNA contains thymine; DNA contains uracil

Which of the following is NOT associated with one of the fundamental characteristics of life?

viruses require host cells to reproduce

polar bears regulate their body temperature

a bacterial cell divides to produce two new cells

sugars are broken down inside cells and are used as a source of energy

Why does ice float in liquid water?

stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water

ice always has air bubbles that keep it afloat

the ionic bonds between the molecules in ice prevent the ice from shrinking

the high surface tension of liquid water keeps the ice on top

Which of the following most accurately describes selectively permeability?

only certain molecules can cross a cell membrane

there must be a concentration gradient for molecules to pass through a membrane

cell membranes consist only of phospholipids

Which of the following crosses phospholipid bilayers the slowest?

a small nonpolar molecules like oxygen

a small polar molecule like water

a large polar molecule like glucose

What do all lipids have in common?

they are insoluble (will not dissolve) in water

they contain less energy than proteins and carbohydrates

they are made from glycerol and fatty acid chains

Which of the following is NOT a problem faced by cells as they increase in size?

as cells become larger, the surface area increases faster than the volume

there is a limit to the amount of metabolic activity that a cell can carry out per unit time

the surface area of a cell limits the number of materials that can be moved into and out of the cell

as a cell becomes larger, it becomes harder to move materials from one location to another within the cell

none of the above; all are problems faced by cells as they increase in size

What do all cells have in common? Choose all that apply.

they contain proteins, nucleic acids, and carbohydrates

they have a membrane-bound nuecleus

Phospholipids assemble in layers to make membranes. Which of the drawings below show the most stable assembly of phospholipids where water is both inside and outside of the membrane?

none of the drawings are correct

Which of the following it true of osmosis?

in osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration

osmosis only takes place in red blood cells

osmosis requires energy to occur

in osmosis, water moves across a membrane from areas of higher solute concentration to areas of lower concentration

Using what you know about simple diffusion, predict which way the "circle molecules" will move in the scenario pictured.

net movement from left to right

net movement from right to left

not net movement (i.e., no change)

Mya Biology

Authored by Charles Martinez

Biology

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MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of the following is (are) true about enzymes? Choose all that apply

enzymes are substrate specific

enzyme function may be destroyed if it is denatured

enzymes are used up in the reactions they catalyze

enzymes lower the activation energy of a reaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is caused by water's high specific heat?

a lake heats up more slowly than the air around it

ice floats on water

sugar dissolves in hot tea faster than in iced tea

oil and water do not mix well

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which series of terms is in the correct sequence of biological organization, from the simplest to the most complex?

molecule, tissue, cell, organelle, organ

organism, ecosystem, community, population, biosphere

community, population, ecosystem, habitat, biosphere

cell, tissue, organ, population, community

tissue, organ system, organ, cell, organism

All of the different microbial (i.e., bacteria, fungi, and protist) species living on the table in front of you make up which level of biological organization?

a population

a biosphere

a community

an ecosystem

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the four most common elements found in living organisms?

hydrogen, carbon, nitrogen, sulfur

nitrogen, oxygen, hydrogen, carbon

hydrogen, helium, carbon, oxygen

oxygen, nitrogen, hydrogen, sulfur

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is shown in the figure?

hydrolysis reaction

condensation reaction

acid-base reaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the name of the bond formed by the reaction?

hydrogen bond

phosphodiester linkage

peptide bond

ionic bond

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Mya Biology

Which of the following is (are) true about enzymes? Choose all that apply

Which of the following is caused by water's high specific heat?

Which series of terms is in the correct sequence of biological organization, from the simplest to the most complex?

All of the different microbial (i.e., bacteria, fungi, and protist) species living on the table in front of you make up which level of biological organization?

What are the four most common elements found in living organisms?

What type of reaction is shown in the figure?

What is the name of the bond formed by the reaction?

What type of molecule is produced?

Based on your understanding of water's polarity, the solute molecule depicted below (and surrounded by water molecules) is most likely _____

Which of the amino acids below could form a hydrogen bond between their R-groups?

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