Answer:
At almost the opposite point on the Earth's surface, the "P" waves reappear. The shadow zone exists because the waves are refracted as they pass through the boundary between the mantle and the core and are diverted from their original paths.
Answer:
sulfur dioxide remains in the atmosphere for a long time, therefore, rapidly heating up the Earth.
Explanation:
In virto fertilization form of assisted reproductive technology.
<h3>IVF: Is the process painful?</h3>
It is comparable to a pap smear or even a vaginal ultrasound appointment. During this technique, an embryo transfer catheter and ultrasound guidance are used to transfer one or more embryos to the uterus. The entire operation will be visible to you on an ultrasound screen. This procedure is painless.
<h3>What distinguishes IVF from in vitro fertilization?</h3>
An IVF procedure involves surgically removing a woman's eggs from her ovaries and fertilizing them in a lab with sperm from a male partner or a sperm donor to produce embryos. (The term "in vitro" refers to the act of fertilizing an egg in a laboratory dish and is derived from the Latin meaning "in glass").
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The question is incomplete. The complete question is:
Question: Why do organisms without oxygen need to convert pyruvate to lactate?
A) because pyruvate is toxic to the cells
B) in order to regenerate NAD+
C) in order to use lactate in the citric acid cycle
D) because lactate is needed to produce ATP
Answer:
B) in order to regenerate NAD+
Explanation:
Kreb's cycle and electron transport chain (ETC) are the aerobic stages of cellular respiration. ETC regenerates NAD+ and FAD+ by oxidation of NADH and FADH2 produced during glycolysis and Kreb's cycle. Here, oxygen serves as the terminal electron acceptor.
Glycolytic reactions use NAD+ as an electron acceptor and produce NADH. Therefore, a constant supply of NAD+ is required to sustain glycolysis. In absence of oxygen, ETC cannot occur and organisms convert pyruvate into lactate. Pyruvate is reduced in lactate and NADH serves as the electron donor. Thereby, lactate fermentation regenerates NAD+ to continue the process of glycolysis.
Arthritis is a term that is initially used to describe inflammation of the joints. Cartilage is a type of body tissue that keeps joints moving freely and functional well, and when they begin to break down or get inflamed, the joints don’t work as well, and it becomes painful to move