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amm1812
3 years ago
8

Is it true that a parfocal microscope allows you to quickly focus using the low power or scanning lens and then to switch a high

er power lens with only a minimal adjustment of the fine focus know? (the first question on the paper)

Biology
1 answer:
Rama09 [41]3 years ago
4 0
Yes it is true you are very smart :) let me know if this is helpful
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Mitochondria have their own DNA. What might that mean about their origin in our cells?
bogdanovich [222]

Answer:

Mitochondria are structures within cells that convert the energy from food into a form that cells can use. Mitochondrial DNA contains 37 genes, all of which are essential for normal mitochondrial function. Thirteen of these genes provide instructions for making enzymes involved in oxidative phosphorylation.

Explanation:

7 0
3 years ago
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Mendel investigates stem length, or height in pea plants what if he had investigated human height instead why would his results
WINSTONCH [101]

Human height is one of the traits that belong to traits that cannot easily be placed in discrete phenotypic classes (there is not only tall and short people, there is continuous variation of height between them). Such traits are usually controlled by more than one gene (polygenic traits).

On the other hand, a Mendelian trait is controlled by a single locus.


6 0
3 years ago
A new DNA strand elongates only in the 5' to 3' direction because A new DNA strand elongates only in the 5' to 3' direction beca
Svetllana [295]

Answer:

The correct answer will be option-DNA polymerase can only add nucleotides to the free 3' end

Explanation:

DNA replication process produces the exact copy of DNA which requires various enzymes. The function of adding a nucleotide to the daughter strand is performed by the enzyme called DNA polymerase.

The DNA polymerase enzyme catalyses the process of DNA replication which requires energy provided by the dNTP. The enzyme adds new nucleotides at 3'-OH end of the DNA which favour the reaction energetically.  

Thus, the new DNA strand appears to be elongated in the 5' to 3' direction.

7 0
4 years ago
Match the following. 1. period during the life of a cell when it has finished mitotic division G1 phase 2. period during the lif
zimovet [89]

Ans.

The cell cycle includes a series of events that results in the formation of daughter cells from a single parent cell. These events include interphase, followed by M phase. The interphase consists of three phases, G0 (Gap 0) phase, G1 phase, S (synthesis) phase, G2 phase, while the M phase consists two phases, karyokinesis (mitotic or meiotic phase) and cytokinesis. At the end of cell cycle, cell enters into G0 phase again and the cycle goes subsequently.

The sequesnce of cell cycle events can be written as follows:

G0→G1→S→G2→M→G0→G1→....

Thus, according to the cell cycle sequence, these terms can be matched as:

1. When a cell finishes its mitotic division, it enters to G0 phase, which is also known as rest phase. Thus, statement 1. matches with G0 phase.

2. The period between end of mitosis and synthesis of genetic material for next mitotic division shows G1 phase, in which cell prepares itself for division. Thus, statement 2. matches with G1 phase.

3. The period of interphase between synthesis of new genetic material and the beginning of mitosis is G2. Thus, statement 3. matches with G2 phase.

4. The period between two mitotic division is interphase. Thus, statement 4. matches with interphase.

5. The period of cell division, during which a cell is performing actual cell division is M phase. Thus, statement 5. matches with M phase.

6. The period of interphase, during which genetic material gets doubled is synthesis or S phase. Thus, statement 6. matches with S phase.


6 0
3 years ago
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Natasha is looking for a material to make tires for a new jogging stroller she designed. Which would be best suited to her produ
V125BC [204]

Answer:

vulcanized rubber

Explanation:

The best material for this purpose is vulcanized rubber. Jogging strollers have wider bases and larger wheels to stabilize them, and these wheels must be durable in order to withstand the stresses introduced during the high speed movement.

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3 years ago
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