The common goldfish Carassius auratus has 100 chromosomes and is tetraploid. The goldfish therefore has _____ sets of chromosomes containing ______ chromosomes each
A. 4; 25
B. 2; 50
C. 4; 100
D. 1; 100
A
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Host ________ is the process by which some cells are capable of degrading an exogenote.
Fill in the blank(s) with the appropriate word(s).
Upon finding a carcass, a raven will only call and attract other ravens to the food source if the ____
a. nearby ravens are relatives b. food source is large and plentiful c. food is found in a resident pair's territory d. food is found in his own territory e. food is being consumed by an animal of another species
Genetic drift is a random process that can change the genetic structure of a population
a. True b. False
Which of these statements concerning the functional characteristics of the heart chambers is NOT correct?
A. During ventricular diastole, blood collects in the right and left atria. B. At the very beginning of ventricular diastole, blood flows directly from the atria into the relaxed ventricles. C. 70% of ventricular filling occurs before the atria contract. D. During ventricular systole, the atrioventricular valves close. E. During ventricular diastole, the semilunar valves open.