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Ksivusya [100]
3 years ago
10

WHEN CELLS ARE NOT DIVIDING, ARE CHROMOSOMES EASILY SEEN. EXPLAIN

Biology
1 answer:
Stels [109]3 years ago
6 0
<span>no--they are spread out as strands instead of being bunched up as chromatids. </span>
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A daughter has hemophilia a recessive sex-linked what are the possible genotypes of her parents
marishachu [46]

Answer:

If a female child has hemophilia it is possible that the mother is a carrier of the hemophilia gene and the father has hemophilia.

Explanation:

  • A daughter gets X chromosome from both her parents.
  • It is generally seen in males.
  • Hemophilia is generally recessive in females.They act as carriers of hemophilia. This occurs because they have a X chromosome that dominates the hemophilia affected gene that they inherit from any parent.
  • But, if both the parents have faulty genes ,i.e the mother is the carrier of the gene and the father is hemophiliac, then the chances are the daughter has hemophilia too.
8 0
3 years ago
Under directional selection, the rate of evolutionary change in gene
laila [671]

Answer: True

Explanation:

When an allele that is dominate and favoured in an individual carrying are heterozygous and the large fitness difference between heterozygous and the homozygotes not in use results to a rapid change in the frequencies of the allele.

4 0
3 years ago
The pH scale is a measurement system that indicates the concentration of blank in a solution
ivanzaharov [21]
The pH scale measures the concentration of how acidic or basic something is. The lower the number below 7, is acidic. Above 7 is basic. 7 is waters purest form.
6 0
4 years ago
Read 2 more answers
What type of membrane proteins are integral proteins that move ions or molecules across plasma membrane?
blsea [12.9K]

Answer:

Channel proteins and Carrier proteins

Explanation:

These are type of membrane proteins that transcend the entire length of  phosphoslipid  bi- layer  in the plasma membrane.They facilitate the movement of ions  and molecules across  the walls of the plasma membranes.

Generally, substances like glucose, amino acids, are too large to pass through the phopholipid bilayers. Likewise ions of  potassium, sodium calcium, because of their polarities can not pass through either. They are ferried across the phospholipid by  group of protein structures called channel proteins. Some are also transported across by carrier  proteins.  The process by which these protein structures  aided the  diffusion of substances across the phospholipid bilayer is called Facilitated diffusion.

Channel proteins are pores, that are filled with water molecules with the entrance  well gated.  That is the entrance  is controlled by part in the inner structure  of the protein  which can open or close the pores  like a gate to control the movement of ions across it. e.g Sodium channels are gated for  movement  of sodium ions by voltage or ligands(chemicals) during  nervous  transmission to elicits action potential. Like wise Potassium channels allow  diffusion of potassium ions across the phospholipid bilayers. it gates are shut when sodium channels are open; this  regulate ion exchange.

Their structures are well fixed in shape , specific  to the substance or ions being  transported;and the rate of diffusion  depends on  the like hood of opening of the gate or closure.

Carrier molecules  also in the membranes  do not have a fixed shape, and their transport  direction is determined by the direction of concentration gradients. Thus they can flip on either sides of the membranes to aid diffusion across. Their movement can  be both passive and active, and the rates  of diffusion depends on the number of available carrier proteins in the membrane. They are also specific to the ions they transport.And are not gated,

Therefore these two membrane integral  proteins  facilitate movements of substances across the phospholipild bilayers

8 0
3 years ago
What is the function of fermentation?
Ira Lisetskai [31]
<span>is to regenerate the co enzyme NAD+, so that the glycolysis process can continue to breakdown glucose, produce ATP, and also produce pyruvate for the continuation of the process at the same time in anaerobic conditions when no oxygen is available.</span>
3 0
3 years ago
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