Root hairs are the extensions of the
a. apical meristem.
b. epidermis.
c. pericycle.
d. vascular bundles.
e. root cap.
Answer: b
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The fertilized egg is totipotent, whereas the cells from the inner cell mass, called embryonic stem cells, are pluripotent. Only the embryonic stem cells can give rise to the entire organism
A. true B. false
This table shows the abundance of iridium in and near the K–T boundary layer. Depths are given as meters above or below the boundary layer. The iridium content of an average Earth rock is 0.4 parts per billion (ppb) of iridium. An average meteorite contains about 550 parts per billion of iridium. Which conclusion do these data best support?
1.the earth was struck by a large asteroid 65.5 million years ago
2.an asteriod collision caused a mass extinction that wiped out the dinosaurs
3.the K-T boundary indicates the beginning of an ice age
4.rates of evolution increased dramatically after the K-T boundary
Sketch an exponential growth curve with correctly labeled axes. Identify two organisms and the conditions under
which they might demonstrate such growth. What will be an ideal response?
DNA synthessis
What will be an ideal response?