EXAM Flashcards
(15 cards)
In the scientific method, a testable, possible explanation for an observation about nature is referred to as which of the following? A) experimental group B) variable C) control group D) hypothesis
Hypothesis
Two or more tissues working together to perform a function would be which of the following? A) organism B) cell C) organelle D) molecule E) organ
Organ
One characteristic of living things is that they use energy and raw materials. Which of the following terms is defined as the sum of all chemical reactions that occur in the body? A) homeostasis B) evolution C) responsiveness D) metabolism
Metabolism
The smallest functional unit of life that performs all vital physiological functions is a(n)? A) organism B) molecule C) organ D) tissue E) cell
Cell
Researchers testing new drugs usually give the drug to one group of people and give placebos, which do not contains the drug, to another group. The group receiving the placebo:
A) is the control group
B) is the experimental group
Is the control group
A substance that, when dissolved in water, removed hydrogen ions, often by releasing hydroxide ions, is referred to as a:
A) base
B) acid
Base
Of the following molecules that are important to life, which is NOT chemically defined as "organic"? A) water B) protein C) carbohydrate D) nuclei acid E) lipid
Water
What is the difference between covalent and ionic bonding?
A) covalent bonds are the sharing of electrons, while ionic bonds are the sharing of protons.
B) covalent bonds are weaker, while ionic bonds are stronger
C) covalent bonds are the sharing of electrons, while ionic bonds involve the transfer of electrons from one atom to another
D) covalent bonds involve the attraction of slightly charged atoms, while ionic bonds involve the sharing of electrons
C
Which of the following is a very long organic molecule that provides instructions for the synthesis of proteins? A) deoxyribonucleic acid DNA B) cholesterol C) ATP D) glycogen
DNA
A protein that functions as a biological catalyst to speed up chemical reactions is called? A) hormone B) product C) enzyme D) peptide E) substrate
Enzyme
Which of the ph values listed below would best describe an acidic solution?
A) 3.2
B) 13.0
C) 7.0
A
The precise linear sequence of amino acids in s polypeptide is which level of protein structure? A) tertiary B) quaternary C) primary D) secondary
Primary
Which of the following does NOT have an electric charge? A) ion B) proton C) Atom D) electron
Atom
A chemical reaction that joins two molecules together, often by removing water as the bond is formed, is called?
A) dehydration
B) synthesis
C) hydrolysis
A
Lipid molecules that are composed of one glycerol and three fatty acids, and that function as stored energy, insulation, and physical cushioning, are called? A) triglycerides B) steroids C) cholesterol D) phospholipid
A
