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svlad2 [7]
3 years ago
10

Over 400 years ago, the bark of the cinchona tree was discovered to contain a chemical compound called quinine. Quinine was, and

still is, used to cure and prevent malaria. This is an early example of __________
a. biotechnology b. scientific modeling
c. genetic engineering d. genomics
PLEASE HELP ITS A TEST
Biology
1 answer:
evablogger [386]3 years ago
5 0

Answer:

a

Explanation:

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The caplike structure on a sperm cell that helps aid egg penetration is called the
madreJ [45]
I think it's called the Acrosome
7 0
3 years ago
Identify the cell organelles found only in plant cells and those found in both animal and plant cells
Xelga [282]

Both= Nucleus,cell membrane,Golgi apparatus, ribosomes are found in Both plant and animal cell

Plant cell =  have a cell wall, a large central vacuole, and plastids such as chloroplasts

hope this helps :)

7 0
3 years ago
The movement of H+ through the ATP synthase is best described as an example of __________. The movement of H+ through the ATP sy
CaHeK987 [17]

Answer:

Facilitated diffusion

Explanation:

Oxidative phosphorylation, involving the Electron transport chain and Chemiosmosis is the third stage of cellular respiration. The main purpose of the ETC is to build an electrochemical (electrical and concentration) gradient across the inner mitochondrial membrane. It does this by using energy to pump protons (H+ ions) from the matrix to the inter-membrane space of the mitochondria.

Facilitated diffusion, also known as passive transport through channels, is a form of facilitated transport involving a passive movement of molecules along their concentration gradient, through channels called membrane proteins.

During Chemiosmosis of Oxidative phosphorylation, protons (H+) flow back down their concentration gradient (from inter-membrane space to matrix) due to the chemiosmotic gradient that has been formed in ETC. However, hydrogen ions (H+) cannot pass through the inner mitochondrial membrane except through an enzyme (protein) found in the inner mitochondrial membrane called ATP synthase. This protein acts as a machine powered by the force of the H+ diffusing through it, down an electrochemical gradient. This movement of H+ via ATP synthase further catalyzes the conversion of ADP to ATP.

It is an example of facilitated diffusion because H+ ions are diffusing across the inner mitochondrial membrane (from inter-membrane space to matrix) via a protein channel or membrane protein called ATP synthase.

4 0
3 years ago
When the homeostasis of the body is disrupted which of the following can occur?
Irina18 [472]

Answer: I think it's (f) all of the above.

Explanation

Because It regulates temperature, glucose, toxins, blood pressure, and pH.

8 0
3 years ago
What role do stop codons play in protein synthesis?
svet-max [94.6K]

Answer:

the genetic code UAG, UAA, and UGA. These codons signal the end of the polypeptide chain during translation.  During protein synthesis, STOP codons cause the release of the new polypeptide chain from the ribosome

Explanation:

8 0
3 years ago
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