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Lelu [443]
3 years ago
15

When rocks are broken down by heat and pressure, chemically weathering has taken place

Biology
2 answers:
KengaRu [80]3 years ago
8 0

it is false on ed{g}enuity

Andreas93 [3]3 years ago
5 0
The answer is false, chemical weathering occurs when rocks, minerals, etc are broken down by atmospheric or biologically produced chemicals.
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defon

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3 years ago
What is meant by the following statement.<br><br>the cell membrane is semipermeable?
aev [14]
Semipermeable means the cell membrane can pick and choose what goes out of it and into it. At least, that's what I believe it is.
3 0
3 years ago
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Wind currents move from low to high pressure. True False
oee [108]

Answer:

False

Explanation:

Wind currents move from <em>high to low pressure</em>.

7 0
3 years ago
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If thymidine dimers created by UV irradiation persist until DNA replication, DNA polymerase is likely to make a mistake reading
marishachu [46]

Answer:

Thymidine dimers is likely to be repair as soon as it is originated but if left unrepaired then it causes  frame shift mutations.

Explanation:

In case of Bacterium if UV irradiation induces covalent linkage of two thymidine present adjacently to each other or on a single strand to make thymidine dimers.

These either excised via DNA repair enzyme like Endonuclease V and the proof reading activity of DNA polymerase I enzyme help in incorporation of nucleotide by taking the unmutated original strand as a template.

These dimers if not excised before second round of replication than the sequence of newly synthesized strand will be altered. As DNA polymerase III enzyme read thymidine dimers as single thymidine nucleotide and incorporate only 1 adenine in the newly synthesizing complementary strand which results in frame shift mutations

It is the mutation in which reading frame of codons is shifted or altered due to deletion or addition of a single nucleotide.

7 0
3 years ago
Imagine that a man is scratched by his cat. A phagocyte near the scratch site recognizes and engulfs a bacterium. Shortly therea
disa [49]

Answer:

The original phagocyte secretes cytokines that attract other phagocytes

Explanation:

Before phagocytosis occurs and with the presence of an original phagocyte at the scratch site mostly a macrophage (also a phagocyte), chemical signals signals are given off to attract phagocytes to the scratch site.

These chemical signals may be cytokines that are given off by macrophages located in the tissue near the infection site etc. These cytokines produced can then stimulate the recruitment of phagocytes including the neutrophils and monocytes from the blood.

5 0
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