The male part of a flower is the
a. carpel.
b. stamen.
c. petal.
d. sepal.
e. receptacle
B
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What serves as the cardiac pacemaker?
a. sinoatrial node b. atrioventricular node c. gap junction d. the left ventricle e. conducting fiber
Given the DNA sequence 5?-TAC AAA ATA CAG CGG-3?, which of these sequences represents a frameshift mutation?
A) 5?-TAG AAA ATA CAG CGG-3? B) 5?-TAC AAA TAC AGC GGG-3? C) 5?-TAC AAG ATA CAG CGG-3? D) 5?-TAC AAA ATA CAC CGG-3? E) 5?-TAC AAA ATA CAG AGG-3?
The site of gravity perception in roots is the root apical meristem
____________________ Indicate whether the statement is true or false.
Reproductive isolation
A. is maintained by certain prezygotic and postzygotic barriers. B. is necessary for species to remain separate. C. means there is no gene flow between two groups of organisms. D. All of the choices are correct. E. None of the choices are correct.