Why is RNA considered by many scientists to have been the basis for early forms of life?
What will be an ideal response?
RNA is capable of both information storage (like DNA) and catalytic activity (like enzymes). RNA can also make exact copies of itself. The abilities to reproduce and to enzymatically catalyze reactions are important characteristics of cells. A primitive RNA-based biochemistry might have functioned much like today's "DNA ? RNA ? protein" system.
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A fetus can get an infection when a pathogen in the mother's blood is capable of crossing the placenta to the fetal circulation and tissues.
Answer the following statement true (T) or false (F)
Class III biological safety cabinets:
a. sterilize the air as it passes over the ma-terial in the cabinet. b. protect the environment from contamina-tion by biological agents by filtering the air as it is exhausted from the cabinet. c. are completely enclosed and have gloves that enable the worker to manipulate the material in the cabinet. d. are often called laminar flow hoods.
Which lipid forms cell membranes?
a. unsaturated fats b. steroids c. waxes d. phospholipids e. saturated fats
Biologists consider the green algae to be the ancestors of plants because
What will be an ideal response?A. green algae have the same kind of chlorophyll as plants. B. many green algae form colonies with specialized cells. C. green algae and plants both have cellulose cell walls. D. All of the above are true.