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Svet_ta [14]
3 years ago
14

When does the circulatory system work with the respiratory system?

Biology
2 answers:
enyata [817]3 years ago
6 0

A. during blood cell formation

leonid [27]3 years ago
3 0
The answer would be A. Blood cell formation
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What apparent curving of the winds is called what
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Coriolis Effect. should be the answer
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Which is NOT a defining characteristic of a mineral?
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Answer:

minerals are not man-made. They are naturally occurring. Minerals concocted in the the lab do not count although there are about 208 man made minerals discovered around mines

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3 years ago
in an experiment, you mutate the retinoblastoma gene such that its gene product behaves as if hyperphosphorylated. the result wo
lakkis [162]

Answer:

1. Weaker

2. Continuous

Explanation:

A tumor suppressor gene codes for retinoblastoma protein (pRb). The retinoblastoma protein binds to transcription factor E2F when DNA damage is detected. The E2F bound to pRb can not stimulate expression of genes that code for proteins required during the process of DNA synthesis. The cell can not enter the S phase.

On the other hand, when the retinoblastoma protein is phosphorylated by cyclin E-CDK2, E2F transcription factor is free to stimulate the expression of genes required for DNA synthesis and the cell proceeds from G1 to S phase.  

When the mutated retinoblastoma gene code for a protein that serves as phosphorylated protein, it will not be able to bind strongly with E2F and there would be continuous expression of genes required for S phase.  

3 0
3 years ago
The most distinctive characteristic of leaf mesophyll cells is that they are filled with
Katyanochek1 [597]
<h2>Mesophyll cells</h2>

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Mesophyll cells constitute the main body of a leaf, occurring between upper and lower epidermis

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The palisade mesophyll is a layer of densely packed, columnar cells which contain many chloroplasts, this layer is responsible for most of the photosynthesis of leaves

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Please select the word from the list that best fits the definition
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respiration

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