Which of the following has the strongest support?
A scientific theory
Collecting data without a specific hypothesis in mind is called
Discovery-based science and hypothesis testing are the two major scientific approaches that help us understand biology.
An explanation for a biological process that is substantiated by a large body of evidence is called a
Researchers use little evidence when formulating a scientific theory.
Which domain of life are humans members of?-
Changes in ________ represent the predominant cause for biological evolution.
A plant will begin flowering in response to changes in length of daylight, temperature and light quality. This is an example of which unifying principle of life?
Living organisms interact with their environment
Which of the following is not a property of life?
Populations of organisms rarely change over time
What type of bond involves equal sharing of electrons?
What type of bond occurs between different water molecules in liquid water?
The outermost shell of most atoms (except for H and He) found in living organisms is full and most stable when it contains 8 electrons.
If an uncharged atom of aluminum has 13 protons, how many electrons does it have?
An atom with a positive charge has
More protons than electrons
Isotopes of an element have the same number of __________ and different numbers of __________
Protons and electrons . . . neutrons
Major elements in human tissues
C, H, O
Why is water considered a polar molecule?
The oxygen end of the molecule has a slight negative charge, and the hydrogen end has a slight positive charge.
Sweating cools your body by
If orange juice has a pH of 4 then it can be described as
An acidic solution
Which of the following is NOT true for a buffer system?
Buffers can only be found in a laboratory
Why does carbon form up to four covalent bonds?
because carbon needs four electrons to fill its outer shell
Which of the following best describes hydrolysis?
The use of water in a reaction to break a covalent bond
What name is given to the following reaction? Galactose (monosaccharide) + glucose (monosaccharide) → lactose (disaccharide) + water
What do cellulose and glycogen have in common?
They are both Polysaccharides
Carbohydrates typically include
C, H, O atoms
By definition, what type of fatty acid has double bonds?
Olive oil is a liquid at room temperature and is therefore expected to have a high proportion of _____________ fatty acids
__________ is a steroid
Proteins are made up of
The linear sequence of amino acids in a polypeptide chain is referred to as its __________ structure.
In cells, the double-stranded molecule that encodes genetic information is
In RNA, the base uracil replaces what base found in DNA?
A specific stretch of DNA that programs the amino acid sequence of a polypeptide is a
When using a light microscope to view a cell you obtained from scraping under your fingernails, you notice that the cell lacks a nucleus; therefore, you conclude that the cell must be a type of __________ cell.
In eukaryotic cells, what name is given to the region between the nucleus and the plasma membrane?
Which of the following is a function of the plasma membrane?
Regulation of the passage of material into an out of the cell.
When mixed with water, phospholipids spontaneously form membranes because they __________.
have hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water
The nuclear envelope is composed of __________.
A double membrane
Information is transferred from the nucleus to ribosomes via __________.
Which of the following is a function of the Golgi apparatus?
Plant cells, unlike animal cells, are characterized by the presence of a __________.
Cell wall central vacuole
Which semi-autonomous organelle is responsible for photosynthesis?
Which of the following is a characteristic of chloroplasts that suggests that they might have evolved from free-living bacteria?
Chloroplasts have their own DNA.