Complete the following sentence. An intron is _______________________
A. a protein that is clipped out post- translationally
B. RNA that is removed during the processing of an RNA molecule and remains inside the nucleus
C. part of an intact, mature mRNA that leaves the nucleus
D. a transfer RNA that binds to the codon
E. a series of amino acids at the end of a new polypeptide that directs transcription to the ER
Answer: B
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Why is surface area to volume ratio important
for all cells?
a. a cell must be small enough to absorb small molecules and atoms b. if a cell has too small a surface area, the surface to volume ratio will be too large c. if a cell has too large a surface area to volume ratio, the plasma membrane is not sufficient to deal with the increased amount of cytoplasm d. surface area to volume ratios are only important for small cells, like bacteria e. more than one of these is correct
Which reaction is NOT an exergonic reaction?
a. protein synthesis b. explosion c. fire d. respiration e. movement
The group ________ includes brown algae and diatoms
Fill in the blank(s) with correct word
In chloroplasts, chlorophyll is contained in flattened sacs called
a) thylakoids. b) cristae. c) cisternae. d) vacuoles.