Which of the following statements is true about protein synthesis in prokaryotes?
A) Extensive RNA processing is required before prokaryotic transcripts can be translated.
B) Translation can begin while transcription is still in progress.
C) Prokaryotic cells have complicated mechanisms for targeting proteins to the appropriate cellular organelles.
D) Unlike eukaryotes, prokaryotes require no initiation or elongation factors.
B
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One regulatory step in the process of gene expression and synthesis of proteins is the actual modification of proteins themselves, called ____ modification
Fill in the blank with the appropriate word.
Consider a living plant cell in a living leaf that has a higher water potential than the fluids surrounding the cell. In such
a situation there should be ____.
a. a net flow of water out of the cell b. gain of water by the cell only if the cell's pressure potential is high enough c. no net flow of water into or out of the cell d. a net flow of water into the cell e. gain of water by the cell only if the cell's pressure potential is low enough
Crossing over is one of the most important
events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. separation of homologous chromosomes occurs. c. separation of sister chromatids occurs. d. it results in the production of haploid gametes. e. it aligns homologous chromosomes at the center of the cell so that they can be separated in anaphase II
When bread gets moldy with visible black or blue spots, you are looking at masses of the colored:a
spores. b. hyphae. c. mycelia. d. ascocarps. e. thalli.