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notsponge [240]
3 years ago
7

In humans, albinism is caused by loss of function mutations in genes involved in the synthesis of melanin, the dark pigment in s

kin. Only people homozygous for loss-of-function allege (genotype aa) have the albino phenotype. In Americans of northern European ancestry., albino individuals are present at a frequency of about 1 in 10,000 (or 0.0001). Assuming that genotypes are in Hardy-Weinberg equilibrium, what is the predicted frequency of Caucasians in the United States who carry a single allele for albinism
Biology
1 answer:
ankoles [38]3 years ago
5 0

Answer: Approximately 1 in 70 individuals carry an mutated allele

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What structure is highly vascular and closely adheres to the surface of the brain?
tatyana61 [14]

Pia mater

<span>Pia mater is a highly vascular tissue that cleaves firmly to the surface of the brain and spinal cord. Pia mater protects the central nervous system by nourishing the brain and allowing blood vessels to pass through it. The inflammation of the pia mater can lead to meningitis</span>




6 0
3 years ago
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Dinitrophenol increases the permeability of the lipid bilayer of the inner mitochondrial membrane to protons. Assuming that all
Zigmanuir [339]

Answer:

The correct answer is : C .It will decrease ATP production because fewer protons will be able flow down through ATP synthase.

Explanation:

  • Oxidative Phosphorylation is a process which involves two steps:  
  1. Transport of electrons from the reduced compounds like NADH (Nicotinamide adenine dinucleotide hydrogen) and FADH₂ (Flavin adenine dinucleotide dihydrogen) through the electron transport complexes, located in the inner mitochondrial membrane, to oxygen for the generation of water molecules.
  2. Synthesis of ATP or adenosine triphosphate from ADP or adenosine diphosphate and inorganic phosphate by an enzyme called ATP synthase which is located in the inner mitochondrial membrane. This enzyme harnesses energy by carrying protons from the inter-membrane space into the mitochondrial matrix and in the process produces ATP.
  • Oxidative phosphorylation takes place in the mitochondria, especially involving the inter membrane space, inner membrane and mitochondrial matrix
  • During the transport of electrons through the protein complexes (I, II, III, IV) of the electron transport chain a proton gradient is generated across the inner mitochondrial membrane.
  • The proton gradient is such that the concentration of protons is more in the inter-membrane space and less in the matrix of the mitochondria.
  • This proton gradient provides the energy to the ATP synthase for the synthesis of ATP.
  • Dinitrophenol is responsible for making the inner mitochondrial membrane permeable to protons. As a result protons can directly diffuse through the inner mitochondrial membrane from the inter-membrane space into the mitochondrial matrix equalising the concentration of protons across the inner mitochondrial membrane. This causes distortion in the proton gradient.  Hence, protons are no longer available for the ATP synthase to operate and synthesise ATP.
4 0
3 years ago
The following image is Flagellates are microbes that have a rod-shaped flagellum that helps with their locomotion. Certain flage
olganol [36]
The correct answer is B !! Both are interdependent thus forming a mutualistic association !!

As both can not live without each other thus making obligate !!

so They share obligate mutual association !! Go with B !!
5 0
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Refer to the diagram to complete the sentence with the
8_murik_8 [283]

Answer:

A:2

B:8

Explanation:

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How does phosphorus reach surface waters​
egoroff_w [7]

It is an essential element for plant life, but when there is too much of it in water, it can speed up eutrophication (a reduction in dissolved oxygen in water bodies caused by an increase of mineral and organic nutrients) of rivers and lakes. Soil erosion is a major contributor of phosphorus to streams.
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