Which of the following would be considered to be a symplesiomorphy of mosses, ferns, conifers, and flowering plants?
Given the following list of characteristics:
A. Chlorophylls a & b.
B. Vascular tissue.
C. Seeds.
D. Flowers.
E. Both flowers and vascular tissue.
A. Chlorophylls a & b.
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Mutations are permanent changes in a cell's DNA base sequence. They typically have negative consequences, but they are also the original source of genetic variation and the raw material of evolution. How can mutations accumulate, given that cells have repair systems that fix changes or breaks in DNA strands?
What will be an ideal response?
The resistance of Archaeans to extremes of temperature, salinity, and pH is thought to be due to what structural feature?
a. covalent crosslinking among membrane phospholipids b. phospholipids that spin, drift, and wiggle without leaving the bilayer c. membrane proteins that are covalently bonded together d. high proportion of unsaturated fatty acids in phospholipids
Magnesium has 12 protons. How many electrons are
in its second energy level? a. 2 b. 4 c. 6 d. 8 e. 10
Jorge has developed prostate cancer, so he undergoes an operation to remove the malignancy. What other structures will the cancer specialists look at to check for metastasis?
A) local arteries B) connecting veins C) neighboring lymph nodes D) portions of the liver