<span>1. One common interaction between biotic and abiotic components of an ecosystem is photosynthesis.
Sunlight is abiotic (solely energy), and it fuels the synthesis of
sugars and proteins inside plant cells once it is taken up by plant
leaves. </span><span>This process also produces oxygen.
</span>
2. Biotic factor that can affect the size of a population in a specific ecosystem:
<span>Number and kinds of predators in the ecosystem.
</span><span /><span>
Predator-prey relationships
When the
moose population is high on Isle Royale, the wolves have more food
source from preying on the moose. This supports an increase in the wolf
population.</span>
<span /><span>
3. Temperature
You can change the temperature to freezing it will affect the aquarium because the organisms will not be able to tolerate the new environment if they are species that thrive in warm temperatures.
</span>
Answer:
- Duplex RNA (dsRNA) can suppress the expression of a gene.
- miRNAs are short, single strands approximately 21 nucleotides long.
- miRNAs suppress gene expression by interfering with transcription.
- RNA interference can temporarily suppress the expression of a target gene.
Explanation:
The RNA interference (RNAi) mechanism is a naturally occurring biological process by which an organism suppresses gene expression by using sequence-specific small non-coding RNAs that are complementary to RNA (posttranscriptional silencing) or DNA (transcriptional silencing) sequences. Since its discovery, this mechanism has been exploited in molecular biology to control the expression of target genes. There are different classes of non-coding RNAs which are able to trigger RNAi gene silencing: microRNAs (miRNAs), small interfering RNAs (siRNAs), piwi-interacting RNAs (piRNAs, only present in animals), etc. During their functioning, these non-coding RNAs are loaded into the RNA-induced silencing complex (RISC) to direct them to target sequences and trigger RNAi (for example, by cleaving target mRNAs). miRNAs are short, evolutionary conserved RNAs, that associate to the RISC complex in order to trigger both transcriptional and posttranscriptional gene silencing. During their biogenesis, small non-coding RNAs are double-stranded RNA (dsRNA), but they lose a strand (the passenger strand) when associate with the RISC complex, conserving only one strand (the guide strand) that bind by complementary base pairing to target sequences (either DNA in the nucleus or RNA in the cytoplasm).
cardiac muscle require lot of energy to perform while skeletal muscle are used in coordinate of bone moments so they require less energy since mitochondria is powerhouse cell so it is highly concentrated in cardiac muscle...
E. produced in both male and female humans
LH and FSH are both gonadotropins, meaning they're secreted by the gonads
LH triggers ovulation in females and helps produce testosterone in males.
FSH helps the germ cells (cells that eventually turn into gametes) of both genders mature
1. What happens in the process of natural selection;
<span>Natural selection is the process which organisms with variations most suited to their local environment survive and leave more offspring. Natural selection occurs in any situations in which more individuals are born than can survive (the struggle for existence), there is natural heritable variation (variation and adaptation), and there is variable fitness among individuals referred to as survival of the fittest.
2. Organisms with greater fitness generally leave more offspring than organisms that are less fit.
This is because </span><span>the organism is better adapted to their environment than the other organism. They can survive and reproduce more while individuals with characteristics that are not suited for their environment either die without reproducing or leave few offspring and are said to have low fitness.
</span>
3. Similarity and differences between natural selection and artificial selection;
<span>In both artificial and natural selection, only certain individuals in a population produce new individuals. However; in natural selection, the environment- not a farmer or animal breeder- influences fitness.</span>
4. Hutton's and Lyell's ideas are important to Darwin;
This is due to the fact that they both <span>contributed to Darwin's theory, which implies that life has been on Earth for a very long time- enough time for all this descent with modification to occur. They stated that: Deep time gave enough time for natural selection to act. For evidence of descent with modification over long periods of time, Darwin pointed to the fossil records.
5. Evolutionary tree and what it implies about all species living and extinct
</span><span>Evolutionary tree or phylogenetic tree is a diagram that represents evolutionary relationship among organisms. The evolutionary trees show the diversity of life on the idea that species change over time. They imply how all organisms are related.
6. Structure of the lion's teeth an adaptation to the lion
Adaptation involves heritable characteristic that increase an organism's ability to survive and reproduce in an environment.
The structure of lion's teeth is an adaptation to the lion because they increase the lions ability to kill prey and tear meat, making it adaptable to an ecosystem and increasing its survival. </span>
