____ is the site of protein synthesis
A. Ribosomes
B. Nucleus
C. Mitochondria
D. Smooth endoplasmic reticulum
Ans: A. Ribosomes
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True or false: Experiments generating simple molecules under conditions resembling that of early Earth demonstrate that the first cells are likely to be extremely similar to cells found today
A. true B. false
When we say that DNA replication is semiconservative, we mean that:
A. only half of an organism's DNA is replicated during each cell division. B. when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. C. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. D. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. E. None of the answer options are correct.
If the bacterial cells were viewed immediately after crystal violet was applied during the Gram stain procedure, gram-positive cells would be purple but gram-negative cells would be colorless.
Answer the following statement true (T) or false (F)
One surface of an epithelium faces the environment or some body fluid. The opposite surface is glued to an underlying tissue by:
a. tight junctions b. connective tissue c. the basement membrane d. adhering junctions e. stratified epithelium