Ribosomes are composed of
a. proteins only.
b. proteins and DNA.
c. proteins and RNA.
d. glycolipids and DNA.
e. glycolipids and RNA.
C
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When an animal is apparently aware of its circumstances and uses reasoning to achieve a goal it is said
to have _____.
a. operant conditioning b. habituation c. cognition d. raven awareness e. learning
Sickle-cell anemia has been traced to what type
of mutation?
a. frameshift b. base-pair substitution c. mutagenic d. transposable element e. viral
A torn tendon sidelines athletes for long periods of time because the tissues possess less vascular tissue than bone
Indicate whether the statement is true or false
What is a good estimate of the background rate of species extinction?
A) one species per day B) one species per year C) one species per millennium D) one species per million years