Life
Life is organized in a hierarchical fashion. Which sequence correctly lists that hierarchy from least inclusive to most inclusive?
A) ecosystem, population, organ system, cell, community, molecule, organ, organism, organelle, tissue
B) cell, molecule, organ system, organ, organelle, population, tissue, organism, ecosystem, community
C) molecule, cell, organism, organ system, tissue, population, organ, organelle, community, ecosystem
D) molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem
D) molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem
Organic compounds
A) always contain nitrogen.
B) must be synthesized by animal cells.
C) always contain carbon.
D) always contain oxygen.
C) always contain carbon.
The tertiary structure of a polypeptide refers to
A) its size.
B) the presence of pleated sheets.
C) the amino acids of which it is made.
D) the overall three-dimensional structure.
D) the overall three-dimensional structure.
Which statement about cells is true?
A) All cells have cell walls.
B) All cells have internal structures that move.
C) All cells are attached to other cells.
D) All cells are motile.
B) All cells have internal structures that move.
Which system works with the skeletal system to help maintain posture and move your limbs?
Muscular
A person who is eating a hamburger is mainly eating ground-up beef muscle. What levels of organization are represented in this ground-up muscle?
A) organism, population, and community
B) organ, organ system, and organism
C) organelle, cell, and tissue
D) tissue, organ, and organ system
C) organelle, cell, and tissue
The four most common elements in living organisms are
A) C, H, O, Fe.
B) C, H, O, Na.
C) C, H, O, N.
D) C, N, O, Na.
C) C, H, O, N.
A protein containing more than one polypeptide chain exhibits the ________ level of protein structure.
A) primary
B) secondary
C) tertiary
D) quaternary
D) quaternary
The nucleus of a cell
A) is surrounded by a single layer of membrane.
B) is contained within the nucleolus.
C) contains DNA.
D) is the primary location of protein synthesis.
C) contains DNA.
Which system filters excess waste water?
Urinary
People with lactose intolerance are unable to
A) produce milk proteins.
B) produce lactose.
C) digest cellulose.
D) digest lactose.
D) digest lactose.
The results of dehydration reactions can be reversed by
A) condensation reactions.
B) hydrolysis reactions.
C) polymerization reactions.
D) the addition of an amino group.
B) hydrolysis reactions.
A major type of lipid found in cell membranes is
A) saturated fats.
B) phospholipids.
C) glycerol.
D) unsaturated fats.
B) phospholipids.
In the plasma membrane, the phospholipid heads
A) are hydrophilic and face outward toward the aqueous solution on both sides of the membrane.
B) are hydrophilic and face inward, shielded from water.
C) are hydrophobic and face outward toward the aqueous solution on both sides of the membrane.
D) are hydrophobic and face inward, shielded from water.
A) are hydrophilic and face outward toward the aqueous solution on both sides of the membrane.
Which system is a network of glands throughout the body?
Endocrine
Table salt is formed when
A) chlorine gives an electron to sodium.
B) a hydrogen bond forms between sodium and chlorine.
C) sodium and chlorine share electrons to form a bond.
D) sodium donates its single outer electron to chlorine.
D) sodium donates its single outer electron to chlorine.
A molecule with the formula C55H110O55 is probably a(n)
A) oil.
B) steroid.
C) protein.
D) polysaccharide.
D) polysaccharide.
How are genes used by cells to build proteins?
A) The genes in DNA direct the synthesis of an RNA molecule, which is used to build a protein.
B) The genes in RNA direct the synthesis of a DNA molecule, which is used to build a protein.
C) DNA is transcribed into an amino acid sequence.
D) The genes in RNA direct the synthesis of proteins directly.
A) The genes in DNA direct the synthesis of an RNA molecule, which is used to build a protein.
Which cell structures are associated with the breakdown of harmful substances?
A) chloroplasts
B) mitochondria
C) peroxisomes
D) centrioles
C) peroxisomes
Which system houses the largest organ in the body?
Integumentary
A hydrogen atom has one electron. How many covalent bonds can hydrogen form?
A) one
B) two
C) four
D) none
A) one
Which list contains only polysaccharides?
A) sucrose, starch, and cellulose
B) starch, amino acids, and glycogen
C) cellulose, starch, and glycogen
D) fructose, cellulose, and glucose
C) cellulose, starch, and glycogen
If you ate a 100% plant-based (vegan) diet, what molecule would you never eat?
A) starch
B) cellulose
C) cholesterol
D) phospholipids
C) cholesterol
Which statement regarding cells is false?
A) All cells are enclosed in a membrane that maintains internal conditions different from the surroundings.
B) All cells have a cell wall.
C) All cells can interconvert forms of energy.
D) All cells have DNA as their genetic material.
B) All cells have a cell wall.
Which two systems work together to move oxygen and co2 around the body?
Cardiovascular and respiratory systems