Answer:
b
Explanation:
because of you have a sperm and an egg it wont be right and the others aren't well described
As the world changes, plants and animals change with it. Aside from a few living fossils, the species we see today are very different from species that lived in the past.
<h3>What is the minimum age of a fossil?</h3>
A living being that lived more than 11 thousand years ago is considered a fossil, that is, before the Holocene, which is the current geological epoch.
Ancient remains or evidence, but less than 11,000 years old, such as sambaquis, are classified as subfossils.
The dating of a fossil can be done based on the already known percentage of Carbon-14 (C14) in relation to Carbon-12 (C12) of living matter (without decomposition).
Thus, the fossil record can be used to show that organisms changed to meet new conditions.
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Answer:
their shape, which relates to the lock-and-key model
Explanation:
Enzymes are biological catalysts that are proteinous in nature. Their proteinous nature implies that they are made of amino acids, which forms a three-dimensional shape that accounts for their functionality and specificity. This means that enzymes are substrate-specific because of their 3D shape.
The three-dimensional shape of an enzyme determines the kind of substrate it will bind to. Enzymes, generally, catalyze reactions by binding to a substrate at their active site. This binding follows a lock and key pattern or model. In a nutshell, the primary source of specificity of enzymes is attributed to their SHAPE, which relates to the lock-and-key model.
It is possible to INCREASE the levels of the protein X by transcription factor binding and epigenetic modifications that induce the expression of the protein-coding gene.
<h3>What are transcription factors?</h3>
Transcription factors can be defined as specific proteins that bind to certain gene regions called promotors in order to promote the transcription of genes.
Moreover, epigenetic modifications such as DNA methylation and histone acetylation may alter the structure of chromatin in order to enable gene transcription.
In conclusion, it is possible to INCREASE the levels of the protein X by transcription factor binding and epigenetic modifications that induce the expression of the protein-coding gene.
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