All of the following cellular structures are functionally important in cells of the gametophytes of both angiosperms and gymnosperms, except
A) haploid nuclei.
B) mitochondria.
C) cell walls.
D) chloroplasts.
E) peroxisomes.
Answer: D) chloroplasts.
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Because of hydrogen bonding, water is uniquely suited for its central role in life. Many hydrophilic molecules interact freely with water, but there are a number of hydrophobic molecules important for life, too
How does the interaction between water and hydrophobic molecules help to organize biological systems? A. Because cells are not pure water (they have many substances dissolved within them), the hydrophilic/hydrophobic effect has little role in biological organization. B. The ionic bonds between water cause hydrophobic molecules to associate with one another and not with water molecules. C. Because water molecules preferentially associate with one another, they force hydrophobic molecules to associate with one another and not with water molecules. D. None of the above
Why are red algae found in deeper oceanic waters?
A. They possess pigments that allow them to utilize red light. B. They are able to utilize the more saline deep water. C. Red algae prefer the warmer deep water. D. They possess pigments that allow them utilize blue-green-light. E. Fewer algae predators are found in deeper water.
Which of the following is not a characteristic of infectious mononucleosis?
A. Active EBV can be passed in saliva. B. Symptoms include fever, sore throat, and swollen lymph glands. C. The virus remains within a person's body for the rest of his or her life. D. There is uncontrolled white blood cell proliferation. E. It is caused by an Epstein-Barr virus.
All enzymes are proteins.
Answer the following statement true (T) or false (F)