How is the joining of amino acids catalyzed during translation?
a. by the enzyme peptidyl transferase
b. by the enzyme reverse transcriptase
c. by the enzyme polyadenylase
d. by the enzyme RNA polymerase
Ans: a. by the enzyme peptidyl transferase
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Which type of lifestyle is demonstrated by bacteria in biofilms?
A. Sessile B. Photoautotrophic C. Planktonic D. Parasitic
All of the colonies form on the surface of a spread plate, whereas on a pour plate, colonies may be embedded in the agar as well as on the surface.
Answer the following statement true (T) or false (F)
We expect the fossil record to be incomplete for all of the following reasons EXCEPT:
A. All biomolecules, including lipids and pigment molecules, decay immediately after death. B. Fossilization requires burial in sediment. C. Sediments accumulate irregularly. D. Organisms with hard parts tend to fossilize more readily than soft-bodied organisms. E. Under normal conditions, organisms are broken down by biological and physical processes.
The embryonic root, which is where the pollen tube enters the ovule prior to fertilization, is called the ____
a. suspensor b. epicotyl c. hypocotyl d. endosperm e. cotyledon