Answer:
D. Scintillation counter
Explanation:
DNA is usually labelled with radioactive phosphorus, which is a β emitter, so you need a device that can detect β particles.
A scintillation counter detects β particles because they emit a flash of light when they hit a phosphor. The device converts the flashes into electrical signals, amplifies then about a million times, and then counts them.
A, B, and C are wrong. They are all common laboratory equipment, but they can't detect radioactivity of any sort.
Answer:
b) H2O → P680 chlorophyll a pair → PS II primary electron acceptor → Pq → cytochrome complex → Pc → P700 chlorophyll a pair → PS I primary electron acceptor → Fd → NADPH
Explanation:
The energy present in the photons is used to produce high energy electrons during the light chain of reactions. The H2O molecules generate P680 which is an excited chlorophyll molecule. Then the molecules are converted into pheophytin. The pheophytin produce special quinones which are QA and QB. This generates a plastoquinone pool.
<h2>
Answer:</h2>
<u>reactants, </u> <u>products</u>
<u>catalyst</u>
<u>activation energy</u>
<u>enzymes</u>
<h2>
Explanation:</h2>
Chemical reactions convert <u>reactants</u> to <u>products</u>. In nonliving systems, the presence of a(n) <u>catalyst </u>allows the reaction to proceed very quickly and have a lower <u>activation energy</u>. In living systems, this function is carried out by proteins called <u>enzymes</u>.
Answer:
<em>False</em>
Explanation:
The wax acts as a sealant to reduce the stress on the roses during transit and up until the time they can be planted and established into ground soil.