<span><span><span>Understanding the nature and appearance of our galaxy is no small feat, for we live within a disk of obscuring gas and dust.Astronomers do not think that a supermassive black hole at the center of a galaxy is unique to the Milky Way. Rather, it appears to be quite typical of the almost innumerable galaxies in the observable universe. The fact that black holes may be the rule rather than the exception makes it even more important that we continue to study them.</span> </span><span> <span> </span></span></span>
Answer:
A) many noncoding stretches of nucleotides are present in mRNA.
Explanation:
A transcription unit in eukaryotes includes the region that code for mRNA extending from the 5' cap site to the 3' poly-A site. It also includes the controlling regions. The mRNA formed by transcription also has some non-coding intervening sequences. These are called introns. Introns are removed from the primary transcripts by the process of splicing that occurs after transcription.
Therefore, a transcription unit that is 8,000 nucleotides long may use only 1,200 nucleotides to code for a protein having 400 amino acids since the rest of the nucleotides are part of introns and are removed from mRNA after transcription.
Answer:
C) three eudicots and one monocot.
Explanation:
Flowering plants are generally divided into two based on the number of seed leaves. These are:
- Monocots: <em>these are flowering plants with only one seed leaf. Their leaves are usually long and narrow with parallel veination. Seed germination mode is hypogeal. Their stems are usually flesh and without branches and their roots are usually fibrous. Monocots' flowers are usually trimerous, that is, the flower parts are usually in threes.</em>
- Eudicots: <em>as opposed to monocots, they are flowering plants with two seed leaves. The mode of seed germination is epigeal, leaves are usually broad with net veination pattern and they posses tap root system. Flower parts are usually in fours of fives and their stems are usually wide with branches.</em>
Let us look at which of the 2 groups the bunch of flowers collected by the florist belong:
Lilies have parallel vein - monocot
Wild carrot has large taproot - eudicot
Buttercups has five petals - eudicot
Daisies with two cotyledons - eudicot.
<em>Hence, the bunch of flowers contain three eudicots and one monocot.</em>
The correct option is C.
Answer:
Fishing down the food web is the process whereby fisheries in a given ecosystem, "having depleted the large predatory fish on top of the food web, turn to increasingly smaller species, finally ending up with previously spurned small fish and invertebrates".
