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8_murik_8 [283]
3 years ago
13

Igneous intrusions injected between horizontal layers are: A.batholiths B.dykes C.sills D.cones

Biology
1 answer:
AnnZ [28]3 years ago
3 0
The answer is (C) Sills.
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A transcription factor that binds to a gene first and facilitates binding of other transcription factors is called a(n) ________
dsp73

Answer:

A transcription factor that binds to a gene first and facilitates binding of other transcription factors is called an activator transcription factor.

Explanation:

Transcription factors are proteins that regulate the transcription of genes.Transcription is the process where a gene's DNA sequence is transcribed into an RNA molecule. Transcription is a key step in using information from a gene to make a protein.

The enzyme RNA polymerase, which makes a new RNA molecule from a DNA template, must attach to the DNA of the gene. It attaches at a spot called the promoter.In eukaryotes, RNA polymerase can attach to the promoter only with the help of basal (general) transcription factors. They are part of the cell's core transcription toolkit, needed for the transcription of any gene.

A typical transcription factor binds to DNA at a certain target sequence. Once it's bound, the transcription factor makes it either harder or easier for RNA polymerase to bind to the promoter of the gene.

Some transcription factors activate transcription, other transcription factors repress transcription.

7 0
3 years ago
What are index fossils used to determine?
dlinn [17]

Answer:

Index fossil that is also known as indicator fossil is used to determine the age of the layers of the rocks. It says that the new layer of sedimentary rocks lie over the old layer.

The deeper we go, the older the rocks we will find. Index fossil of animals that lived or survived only for a short period of time are very useful. An example of index fossil can be Ammonites that were found in Mesozoic era that was about 25-35 million years ago.

8 0
3 years ago
Which is considered a scientific observation?
jasenka [17]

Answer:

Mahir noticed the plant he watered grew taller than those with less water

Explanation:in the process of the scientific method,an observation about an occurrence happens first before an hypothesis is formulated and tested .

Observation usually involves the the description of a phenomenon.

6 0
3 years ago
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Analysis of the second swab has confirmed that the causative organism is Streptococcus pyogenes, a gram-positive organism. Imagi
Ierofanga [76]

Answer:

Purple, spherical-shaped organisms arranged in chain like formations.

Explanation:

Bacteria are the microscopic organisms and included in the prokaryotes as they do not have nucleus. Two main types of bacteria are gram positive bacteria and gram negative bacteria.

The gram positive bacteria has thick cell wall peptidoglycan cell layer and can uptake the crystal voilet stain. These bacteria seems purple under the microscope due to the uptake of stain. The bacteria Streptococcus pyogenes are spherical in shape and occurs in the cluster of chain.

Thus, the correct answer is option (d).

7 0
2 years ago
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Which body system or structure is responsible for the control and regulation of a person's breathing?
Elanso [62]

Answer: Nervous system

Explanation:

The cerebellum of the brain is the structure of the nervous system known to control various muscles of the body that are involved in involuntary activities such as breathing.

Thus, the nervous system controls and regulates a person's breathing

8 0
3 years ago
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