<span>The correct answer is option D.An ecosystem consists of a population of organisms and its physical environment, and a population is made up of many different communities of organisms. An ecosystem is a bilogical system of populations and environment. And a population consists many communities and finally the communities are nade up of organisms.</span>
Answer:
Natural selection is the process where organisms that are mostly adapted to their environment survive and pass on their genetic traits in generations.
22 ) organelles are the tiny structures that carry out life activities !
23)mitosis as in this no variation takes place !
24) dominant trait.
and I am sure for all the three and suggest you to go for that !!!
Answer:
undergo irreversible repression
Explanation:
Cellular differentiation refers to the process by which one cell and/or cell population divides and differentiates into more specialized cells. During cell fate differentiation, epigenetic marks modify chromatin structure in order to hamper the accessibility of the transcriptional machinery and transcriptional factors to different genes, which are irreversibly repressed. These epigenetic marks include DNA methylation and histone modifications (e.g., histone acetylation, histone methylation, etc). For example, it has been shown that DNA methylation and histone H3 lysine 27 tri‐methylation (H3K27me3) are epigenetic repressive marks on genomic regions that play a major role in gene expression programs during cell fate differentiation.
Answer:
For every turn of the citric acid cycle, one molecule of <u>ATP</u>, four molecules of <u>NADH </u>and one <u>FADH₂</u> molecule is produced.
Explanation:
"For each turn of the cycle, a molecule equivalent to ATP is produced, and 5 pairs of high-energy electrons are captured by 5 carrier molecules: 4 NADH molecules and 1 FADH2. FAD and FADH2 are molecules similar to NAD+ and NADH, respectively"
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