In addition to serving as building blocks of DNA, what other function do nucleotides perform in a cell?
a. regulate cellular activity
b. regulate gene expression
c. chaperone protein folding
d. activate vesicular transport
e. trigger muscle contractions
ANSWER: a
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____ of a trait in a population can be measured and is the proportion of the total variation in the trait (phenotypic variation) that is due to genetic differences among individuals
Fill in the blank with the appropriate word.
Which of the following statements about diffusion is false?
A. It transports materials actively along a concentration gradient. B. It is effective only over small distances. C. It limits the size of prokaryotic cells. D. It limits the shape of prokaryotic cells. E. It supplies key molecules for metabolism.
In animal cells, ____ radiating from the cell center anchor organelles such as the ER and Golgi complex, and provide
tracks for vesicle movement.
a. microfilaments b. microtubules c. laminins d. actins e. cytokeratins
When practicing aseptic culturing techniques, it is important to keep all of the following in mind except
A) surrounding surfaces are decontaminated before and after handling cultures. B) gloves and other protecting clothing may be required depending on the specimen being used. C) the media used to grow the specimen is sterile. D) all of the instruments and lab ware that directly touch the specimen is sterile. E) as long as nothing unintended touches the media, there will be no contamination.