Which of the following statements about mutations is/are incorrect? Choose all that apply.
-Mutations arise from sources other than just mistakes made during DNA replication.
-DNA replication machinery generates errors at a lower rate than RNA transcription machinery.
-Mistakes in transcription are not as critical as mistakes in replication.
-Germ-line mutations can be passed down to offspring.
-Somatic mutations are often passed down to offspring.
-Mistakes in DNA replication do not lead to heritable mutations.
-Mutations in RNA during transcription are not inherited by daughter cells over multiple generations.

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip. nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule. true/false

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities