How is the transfer of T-DNA similar to bacterial conjugation?
What will be an ideal response?
Ans: In both of these processes, a single strand of DNA is transferred from a donor bacterial cell to a recipient (bacterial cell or plant nucleus). In both cases, the process involves nicking of duplex DNA and unwinding of the nicked strand. In the case of T-DNA, there is a second nick in the same strand that releases the T-DNA. In both cases, the displaced strand is replaced by DNA replication.
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Which of the following major protein components of skeletal muscle is incorrectly matched with its function?
A) titin-links thick filaments at Z line B) nebulin-links thin filaments at Z line C) myomesin-myosin binding protein present at M line D) troponin-binds along the length of the thin filaments and covers myosin binding sites E) actin-major component of thin filaments
Which statement describes the fern life cycle?
a. Gametophytes originate within, and are dependent upon, sporophytes b. Sporophytes originate within, and are dependent upon, gametophytes c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation e. Gametophytes are photosynthetic and partially independent from the sporophytes
If you moved plants from a desert-like white sand area north of Perth, Australia, to a moist-soiled forest south of Perth, what would probably happen?
A. The plants would probably do poorly since the two biomes are so different. B. The plants would probably become weeds. C. The plants would probably switch to asexual reproduction. D. The plants would probably find different pollinators. E. None of the answer choices is correct.
Which of the following statements is TRUE regarding tuberculosis?
A) It occurs only in the lungs. B) Several hundred cells are required for infection. C) It remains viable in dried aerosol droplets for up to eight months. D) Only virulent strains of Mycobacterium tuberculosis produce mycolic acid. E) The immune system is not affected by the infection.