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3 years ago

Plss answer all! Help!

Biology

1 answer:

vladimir1956 [14]3 years ago

3 0

Answer:

there are two types of cell one eukaryotic cell that have true nucleus (genetic material enclosed in membrane) and membrane bounded organelles and other is prokaryotic cell that donot have have true nucleus (genetic material dispersed in cytoplasm) and membrane bounded organelles.

similarities between PC and EC is that both contains cell membrane, ribosomes (not a membrane bounded organelle) .

examples of PC are bacteria , paramecium,fungi etc

examples of EC are plant and animal cells

there are two names for cell membrane i.e plasmalemma, cell surface membrane,

selectively permeable or semipermeable means cell only allows those material to pass through its cell membrane which it needs.this cell'ability is important because to protection against the poisonous substance and to maintain cell needs .

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In guinea pigs, smooth coat (S) is dominant over rough coat ( s ) and black coat (B) is dominant over white coat (b). In the cro

hoa [83]

Answer:

9 out of 16 offsprings

Explanation:

This question involves two genes in guinea pig; one coding for coat texture and the other for coat color. The alleles for smooth coat (S) and black coat (B) are dominant over rough coat (s) and white coat (b).

In this question, two heterozygous guinea pigs were crossed i.e. SsBb × SsBb. The gametes produced by each parent is as follows: SB, Sb, sB, sb. Using these gametes in a punnet square (see attached image), the proportion of offsprings will be:

Smooth black coat (S_B_) = 9

Smooth white coat (S_bb) = 3

Rough black coat (ssB_) = 3

Rough white coat (ssbb) = 1

Hence, according to this question, 9 out of 16 offsprings will have a smooth black coat on average.

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3 years ago

What wavelength of radiation has photons of energy 5.44 x 10-18 J?

spin [16.1K]

Answer:

λ = 37 nm

Radiation is in the ultra violet region.

Explanation:

Given data:

Energy of photon = 5.44 × 10 ⁻¹⁸ J

Wavelength of photon = ?

Solution:

E = h.c / λ

λ = h. c/ E

λ = 6.63× 10⁻³⁴m² kg/s × 3×10⁸ m/s / 5.44 × 10 ⁻¹⁸ Kg m²/s²

λ = 19.89 × 10⁻²⁶ kg. m³ /s² / 5.44 × 10 ⁻¹⁸ Kg m²/s²

λ = 3.7 × 10⁻⁸ m

m to nm conversion.

λ = 3.7 × 10⁻⁸m ×10⁹ nm / 1m

λ = 37 nm

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