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Kazeer [188]
2 years ago
5

Imagine you have engineered a set of genes, each encoding aprotein with a pair of conflicting signal sequences that specifydiffe

rent compartments. If the genes were expressed in a cell, predict which signal would win out for the following combinations. Explain your reasoning.
A) Signals for import into the nucleus and import into the ER.
B) Signals for import into peroxisomes and import into the ER.
C) Signals for import into mitochondria and retention in ER (ie,the KDEL signal for retrieval from Golgi to ER). (In this case, you are to assume that we have specially engineered the protein to have a KDEL sequence, and a mitochondrial import sequence, but noamino-terminal signal sequence.)
Biology
1 answer:
Rashid [163]2 years ago
8 0

Answer:

a) into the ER

b) into the ER

c) into mitochondria

Explanation:

a) This signal is located at the N-terminus of the protein and acts before the internal signal is synthesized for import into the nucleus. When the protein enters the ER, the sequence of the import signal in the nucleus cannot work because the protein would be prevented from interacting with the cytosolic receptors.

b) The signal that is imported into the peroxisome cannot function once the protein was sequestered in the ER.

c) In order for the protein to be retained in the ER, the protein must first be imported into the ER. Without there being no signal for that import of the protein into the ER, that retention signal could not work.

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Answer:

peptide antigens by MHC class II molecules

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In a study published in the journal Nature, scientists studied eight ponds in Florida: four that were populated by a species of
AlexFokin [52]

Answer: the rate of pollination of flower, in a field next to a pond with no fish, will DECREASE.

Explanation:

POLLINATION is defined as the process by which flowering plants, through the aid of external agents such as insects,wind, water and other animals, are able to transfer pollen grains from an anther to a receptive stigma. Insects are the most common pollinators. They visit flowers to obtain nectar and pollen as source of food. Flowers use various features, such as colour and scent, to attract and guide insects to the food source within them. In the process of reaching their source of food, insects bring about pollination.

From the study conducted by scientist in Florida, eight(8) ponds where subjected to the the study. The first four (4) ponds had species of fishes that fed on dragonflies and dragonfly larvae, hence the reason for a decrease in the population of the dragon flies in the area around it. While the remaining four (4) ponds had NO fish and the area around it is populated with dragonflies and dragonfly larvae. This is so because of the absence of fish.

It was then noted that the dragon lies fed of the insect pollinators such as the bees and butterflies. Since these dragonflies and its larvae are abundant in the field which is close to the pond with no fish, they will grossly depend on the insect pollinators as their source of food thereby decreasing the rate of pollination in the field next to the pond with no fish.

7 0
2 years ago
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miv72 [106K]

Answer:

True

//////////////

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Answer:

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Explanation:

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The more carbon dioxide in the atmosphere, the more the gas dissolves in the oceans. This is why more corals are bleaching around the world. The dissolved carbon dioxide is lowering the pH of the ocean waters because of the formation of more carbonic acid.

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