Given that a cell is undergoing meiosis, at the end of meiosis I, its number of chromosomes would be in half. Provided in the question that the cell in G1 has 40 chromosomes, at the end of meiosis I, there will be 20 chromosomes in each daughter cell. And each chromosome has two sister chromatids, then there will be 40 sister chromatids in each daughter cell.
Answer:
Enzymes' shapes are important because it determines the specific substrate it will act onto.
Explanation:
The shape of the enzymes are explained by two theories, which are Lock and Key Theory and Induced Fit Theory.
<h3>Lock and Key Theory </h3>
This was first coined by <em>Emil Fischer in 1894</em>. Just like how a key has a specific keyhole, <u>enzymes' active sites are supposed to act on specific substrates to produce a catalyzed effect</u>. Incorrectly shaped keys or enzymes will not fit into a lock (substrate) not assigned for it.
<h3>
Induced Fit Theory</h3>
this theory was proposed for the substrates that do not qualify for the Lock-and-Key theory, or <u>enzymes that have more than one active sites</u>. It is said that the <u>substrate determines the final shape of the enzyme</u>, and that the<u> enzyme is somehow pliable</u>. The enzyme is then modified by the substrate to form an enzyme-substrate complex. This explains why two or more enzymes can catalyze a single substrate.
<h3>Additional notes:</h3>
For enzymes to work, they may need specific molecules.
A coenzyme may be <u>metal ions (iron, copper, magnesium)</u> or <u>organic molecules (Vitamins B2, B3, B8)</u> which attach to an enzyme to form a holoenzyme. An apoenzyme is an enzyme with only its protein part sans the cofactor.
Answer: Option A) healthy fish populations.
Explanation:
Wetlands include swamps and marsh. i.e areas of land covered with water.
Once, wetlands are destroyed by human activities there would be:
- a reduction in the population of plant and animal that rely on its native organisms due to starvation.
- increased frequency of floods since excess water can no longer be collected there
- pollution of nearby streams as rain will wash off materials into them
However, healthy fish populations does not happen since producers like plankton eaten by the fishes are also destroyed.
Thus, healthy fish populations is the unlikely outcome
