Which feature of cycads distinguishes them from most other gymnosperms?
1. They have exposed ovules.
2. They have flagellated sperm.
3. They are pollinated by animals.
A) 1 only
B) 2 only
C) 3 only
D) 2 and 3
D
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What nucleoside trisphosphate, other than ATP, provides some of the energy for protein synthesis?
A. CTP B. GTP C. TTP D. UTP
In the accompanying figure, the structure labeled “H” is a ____
a. muscle fiber b. sarcoplasmic reticulum c. mitochondria d. myofibril e. Z line
When reconstructing a phylogeny and creating an evolutionary tree, scientists follow which of the following guidelines?
1.The path with the greatest number of nucleotide sequence changes is selected. 2.Data from outgroups are excluded so as not to bias the tree. 3.The path with the fewest number of steps is the most likely to occur. 4.The total number of differences between the groups must always be a constant within the tree.
The incentive for economic activity in capitalism is ____. However, in socialism, it is __________
Fill in the blank(s) with the appropriate word(s).