Answer:
The bacterial fission occurs by the following method:
The DNA replicates. The replicated DNA is copied and it moves to the opposite sides of the cell. The length of the parent cell increases. The cell divides from the center with distribution of equal amount of DNA. After this, the cell wall is formed.
In protist fission: In protist fission, the nucleus of the parent cell divides many times. After this cytoplasm separates and forms around the daughter nuclei.
C. Microscope
They were able to get magnification like never before
Answer:
It seems that a reciprocal translocation is going on.
Explanation:
A translocation occurs when a chromosomal fragment changes its location in the same chromosome from the original to a new one. Or when it leaves the chromosome to re-locate in a new different chromosome.
According to this, there are different types of translocations:
- Intrachromosomal translocations:
- Intra-radial: the change in position occurs in the same arm of the chromosome. For instance, 123.456789 → 123.478569
- Extra-radial: The change in position occurs from one arm to the other of the same chromosome. For instance, 123.456789 → 15623.4789
- Extrachromosomal translocations:
- Transposition: not reciprocal interchange. The fragment leaves a chromosome to re-locate in another chromosome. The other chromosome does not send any fragment to the first one.
- Reciprocal translocation: There is a reciprocal interchange. A fragment of chromosome A goes to B, and a fragment of chromosome B goes to A.
Reciprocal translocations might be:
- Fraternal: the interchange occurs among homologous chromosomes
- External: the interchange occurs among non-homologous chromosomes
Reciprocal translocations are easily recognized during meiosis because an association between four chromosomes can be observed. This association is a quadrivalent structure.
During metaphase 1, the centromeres involved in the quadrivalent originate centromeric co-orientation or disjunction.
Answer:
D) Energy is required in order to maintain homeostasis--without a constant, organized internal state, the cell will die.
Explanation:
Homeostasis is the condition of relative stability that the body needs to perform its functions properly for the body's balance.
Despite changes that may occur in the body, internally or externally, homeostasis is the constancy of the internal environment (interstitial fluid). Keeping at an appropriate temperature (37º C) ensuring that the necessary changes to the body occur; and thus the cells of the body develop.
Because of homeostasis, cells need a constant supply of energy. That's because energy is needed to maintain homeostasis - without a constant, organized internal state, the cell will die.
Question: A "mystery molecule" was isolated in a laboratory and scientists found that the molecule readily crossed artificial membranes. Which of the following molecules can be ruled out as the "mystery molecule?"
a) CO2
b) O2
c) Cl-
d) H2O.
Answer:
c) Cl-
Explanation:
Membranes are the bilayers of phospholipids. The core of the membranes is non-polar and hydrophobic in nature due to the presence of non-polar fatty acid tails of phospholipids. The non-polar core of the membranes does not allow the charged particles such as chloride ions and the other polar and large substances to move through the membrane. The observed molecule could easily cross the artificial membrane. This means that the molecule was not a charged particle such as chloride ions.
