Most conifers have only tracheids. Which structural feature allows water and minerals to pass from one tracheid to the next?
A) Stomata
B) Pits
C) Secondary cell walls
D) Plasmodesmata
E) Sieve plates
B
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The donor cell makes ___________ whose function is to bring F- cells close enough to transfer a ___________ to the recipient.
A. a sex pilus, single strand of DNA B. a sex pilus, double strand of DNA C. an F factor, fertility plasmid D. an F factor, replicated F factor E. a sex pilus, bacterial chromosome
Removal of introns, addition of a poly-A tail and addition of a guanine cap are all events that occur during:
a. protein folding. b. transcription. c. replication. d. post-transcriptional modification. e. translation.
I've cloned a genomic library and know that my bacteria have foreign DNA fragments inserted into the
cloning vector. I now need to identify the specific bacteria that have the gene coding for protein X. How can I locate these bacteria?
a. DNA hybridization of the different colonies b. PCR of the same bacterial mixture that was spread on agarose plates c. restriction endonuclease treatment of DNA from some of the bacterial colonies d. agarose gel electrophoresis of DNA isolated from the bacterial colonies e. transfer the bacterial colonies to filter paper
Plasma is the fluid portion of blood
Indicate whether the statement is true or false.