Which of the following is the primary product of the light-dependent reactions of photosynthesis?
A. Water
B. ATP and NADPH
C. Oxygen only
D. Glucose
Answer: Option B
Solution (By JKExamLibrary)
Light reactions occur in the thylakoid membranes, converting light energy into chemical energy in the form of ATP and NADPH, with oxygen as a by-product. These energy-rich molecules are used in the Calvin cycle (light-independent reactions) to fix CO₂ into carbohydrates. Glucose is a final product of the Calvin cycle. Oxygen is released but not the primary product. Thus ATP and NADPH are the main outputs.
Explanation:
DNA polymerase catalyzes the formation of phosphodiester bonds between adjacent nucleotides, extending the new strand complementary to the template. Helicase unwinds DNA, ligase joins fragments, primase synthesizes RNA primer. In prokaryotes, DNA polymerase III is the main replicative enzyme.
Explanation:
Fertilization typically occurs in the ampulla, the widest region of the fallopian tube, where the sperm meets the secondary oocyte. The zygote then travels to the uterus for implantation. The ovary releases the egg, the uterus supports embryo development, the cervix is the lower portion opening into the vagina.
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