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nevsk [136]
3 years ago
7

The _____ theory states that the basic level of life is that of the individual cell.

Biology
1 answer:
Kobotan [32]3 years ago
4 0
It is part of the cell theory
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Which of the following is NOT a type of Devonian arthropod?
mamaluj [8]

Answer:

D) None of the above

Explanation:

Arthropods are characterized by the possession of an exoskeleton and a segmented body. This group includes insects, arachnids, myriapods (centipedes and millipeds), and crustaceans.

The Devonian period, belonging to the Paleozoic Era, occurred from around 415 million to 350 million years ago. During this era, arthropods such as centipedes, millipedes, and flightless insects were predominant and diversified throughout this period.

Therefore, as all of these arthropods were present in the Devonian period, the correct answer is <u>d) None of the above</u>.

4 0
3 years ago
Which is a reliable source of scientific information
irga5000 [103]

Answer:

a website with .edu .gov or a book written by a famous professsor or scientist

Explanation:

4 0
3 years ago
The interaction between DNA and histone proteins (forming nucleosomes) plays a key role in the regulation of gene expression in
ladessa [460]

Answer:

A. The chromatin near cis-regulatory sequences will be more closed and there will be less transcription.

Explanation:

In the presence of histones, the cis-regulatory sequences of DNA like promoter, enhancers etc. are not exposed. The function of the histone acetyltransferases (HATS) is to cause chromosome decondensation i.e. removal of histones from the DNA so that transcription of the DNA could occur. Histone acetyltransferases (HATS) cause acetylation of lysine amino acid of the histone proteins. Acetyl group is negatively charged so the acetylation of histone proteins leads to the removal of their positive charge which ultimately leads to the decrease in the interaction between N terminal of histones and negatively charged phosphate group of the DNA molecule. As soon as histones are removed from the DNA where cis-regulatory sequences are located, the DNA becomes accessible for transcription.

But here a drug has been added which blocks the activity of histone acetyltransferases (HATS) in cancer cells. So it is quite evident that in these cells, histones will not get removed from the cis-regulatory sequences of DNA so the DNA will be more closer or tightly packed as a result of which  less transcription will occur.

7 0
3 years ago
Which level of biological classification do Mammalia and Hominidae represent, respectively?
cupoosta [38]
The answer is class and family.

<span>Taxonomic groups are used for biological classification. There are eight main taxonomic groups: domain, kingdom, phylum, class, order, family, genus and species, with the domain as the most inclusive and species as the least inclusive. If we take a look on Mammalia and Hominidae classification, we can assume that Mammalia represents class, and Hominidae represents family:</span>

<span>1. Domain: Eukarya</span>

<span>2. Kingdom: Animalia</span>

<span>3. Phylum: Chordata</span>

<span><u>4. Class: Mammalia</u></span>

<span>5. Order: Primates</span>

<span><u>6. Family: Hominidae</u></span>

<span>7. Genus: Homo</span>

<span>8. Species: Homo sapiens</span>

3 0
3 years ago
What 2 components are often found as part of an enzyme
katen-ka-za [31]
That would be peptide bonds
4 0
2 years ago
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