The basic building blocks of DNA are ____
a. proteins
b. fats
c. amino acids
d. nucleotides
e. phosphates and sugars
ANSWER: d
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Why is there an upper limit to the surface area-to-volume ratio in a cell?
a. The volume of the cell maximizes the use of phospholipids. b. The surface area must be sufficient to provide adequate nutrient and waste exchange to sustain the chemical activities of the cell. c. The cells require a balance between endocytosis of precursor molecules to transporters in the membrane. d. The size of a cell is limited by the number of mitochondria. e. The organelles in cells require communication with the extracellular environment to support internal functions.
Proteins carry out much of the biochemistry of life, including DNA replication, but DNA stores the information needed to build correct proteins. Early life forms would have needed both proteins and DNA, but neither can exist without the other
The RNA world hypothesis is an appealing solution to this problem, because it states that ________. A) RNA can evolve into DNA by natural selection B) proteins can store the information needed for their own synthesis C) RNA is more chemically stable than DNA D) nucleotides of RNA are chemically similar to amino acids E) some RNA molecules both store information and catalyze chemical reactions
What is biology?
A) the scientific study of life B) the scientific study of the environment C) the scientific study of DNA D) the scientific study of ecosystems
Darwin's theory of evolution was based on his observations during his voyage to Asia
Indicate whether the statement is true or false