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REY [17]
3 years ago
11

Complete the following sentences.

Biology
2 answers:
djyliett [7]3 years ago
7 0
1. The appearances of fireflies at dusk is an example of a circadian rhythm because it's happens daily. The correct option among all the options that are given in the question is the third option or option "c".

2. During migration, animals undertake a seasonal movement. The correct option among all the options that are given in the question is the first option or option "a".
DerKrebs [107]3 years ago
4 0

Answer:

1. Option C

2. Option A

Explanation:

1. A circadian rhythm is basically a cycle of processes (physiological, chemical, and behavioral) that repeats itself after every twenty four hours or in other word it occurs daily. Some of the common examples of circadian rhythm are -  

a) Cycle of sleep and wake

b) Cycle of food digestion etc.

The appearance of fireflies at dusk is an event that happens every day and hence it is a circadian rhythm.

2. Almost all the migrating animals migrate based on the season. For instance, birds migrating long distance are travelling to cope up with the seasonal changes. For instance, some of these birds breed in temperate or Arctic during the summer season and during autumn season they return back to the warm south regions

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Which of the following structures consists mainly of white matter?
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Answer:

The corpus callosum

Explanation:

The corpus callosum is the largest white matter structure in the brain. It is located beneath the cerebral cortex and it connects the left and right cerebral hemispheres thus enabling communication between them. The corpus callosum is a bundle of nerve fibers, (axon projections) which transmits neural signals.

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Which consist of sperm cells and egg cells? <br> gametes<br> tetrads<br> diploids<br> chromosomes
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The answer is Gametes
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What are the monomers to proteins
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Explanation:

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2 years ago
Many useful products, mainly for medical purposes, are produced by cloning human genes into other organisms, which then mass-pro
ANEK [815]

Answer:

The correct answer is : A.

Explanation:

  • This is because of the following reasons:
  1. Escherichia coli is a bacteria and hence is a prokaryote.
  2. The cloning of human (eukaryote) genes is done to obtain in-vitro protein expression which are to be used a pharmaceutical compounds.
  3. Although the phenomenon of Central Dogma takes place in both Prokaryotes and Eukaryotes, the mechanism is very different.
  4. Some of the differences includes:
  • Eukaryotic genes contain certain non-protein encoding sequences called the Intron sequences which needs to be removed from the transcribed mature mRNA by Spliceosome. This phenomenon is absent in prokaryotes as they do not possess introns. Hence, proper processing of eukaryotic mRNA is not possible in prokaryotes.
  • The mature eukaryotic mRNA has a 5' cap and 3' polyadenylated tail which is added by a capping enzyme and a poly-A polymerase enzyme to increase their stability. This will not be possible in a prokaryote as they lack these enzymes.
  • The translation of membrane proteins and secretory proteins is carried on by the ribosomes bound to the endoplasmic reticulum. This structure is absent in prokaryotes, hence they will be unable to produce a proper polypeptide sequence.
  • Finally, the eukaryotic proteins undergo various modifications after formation, like methylation, acetylation, etc. These reactions cannot be carried out in a prokaryote as they lack the respective enzymes.
  • Hence, we see a properly folded functional eukaryotic protein cannot be produced in a prokaryote.

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The perihelion is the point at which Earth is closest to the Sun, and the aphelion is the point at which Earth is farthest away.
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Perihelion marks the begging of summer when the earth is closest to the sun.
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