Which item is responsible for joining nucleotides to build a new stand of dna

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

Utilizando-se duas lâminas de microscopia, foi colocada uma gota de sangue humano em cada uma delas. a cada gota foi juntada igual quantidade de soro anti-a na primeira e soro anti-b na segunda. após a mistura do sangue com os respectivos soros, foi observada aglutinaç? o nas duas lâminas. a partir desses dados podemos afirmar que o indivíduo, quanto aos grupos sanguíneos abo, é: escolha uma: a. grupo b. b. grupo ab. c. possui dois tipos de anticorpo no plasma. d. possui apenas um tipo de anticorpo no plasma. e. grupo a.

Species can vary in several ways. which of the following is one of darwin's ideas that was accepted by most scientists of his time due to the large number of fossils being discovered at that time? a. species vary around the world. b. species have specific adaptations to their local environment. c. species that live in seawater can also live on mountains. d. species change over long periods of time.