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2 years ago

A wide U-shaped valley is shown in the photograph below.

Biology

1 answer:

Ronch [10]2 years ago

7 0

Answer:

Glacier

Explanation:

Glaciers erode the Earth and cause distinctive u-shaped valleys.

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How much weight can you lose fasting for 24 hours?

stich3 [128]

There is no correct answer here it depends on your body and how fast your motabolism is.

5 0

3 years ago

What is the amount of heat energy needed to raise the temperature of

34kurt

Answer:

25116 J

Explanation:

Q = m × c × ΔT

c = 4.186 J/g°C

M=200 g

So,

Q = 200 × 4.186 × (40-10)

=200 × 4.186 × 30

=25116 J

7 0

2 years ago

Most black bears (Ursus americanus) are black or brown in color. However, occasional white bears of this species appear in some

Sphinxa [80]

Answer and Explanation:

The number of observed individuals:

AA 42

AG 24

GG 21

Total number of individuals, N= 87 = 42 + 24 + 21

Allelic frequencies:

f(p) = (2 x AA + AG)/ 2 x N

f (p)= (2 x 42 + 24) /2 x 87

f (p) = (84 + 24) / 174

f (p)= 108 / 174

f (p) = 0.62

f (q) = (2 x GG + AG)/2 x N

f (q) = (2 x 21 + 24 )/2 x 87

f (q) = (42 + 24)/ 174

f (q) = 66/174

f (q) = 0.38

p + q = 1

0.62 + 0.38 = 1

The expected genotypic frequency:

F (AA)= 0.62 ² = 0.3844

F (AG) = 2 x A x G = 2 x 0.62 x 0.38 = 0.4712

F (GG) = 0.38 ² = 0.1444

AA + AG + GG = 0.3844 + 0.4712 + 0.1444 = 1

The number of expected individuals:

AA= (0.62)² x 87 = 0.3844 x 87 = 33.44

AG= (0.4712) x 87 = 40.99

GG= (0.38)² x 87 = 12.563

Total number of expected individuals = 33.44 + 40.99 + 12.563 = 87

Chi square= sum (O-E)²/E

AA= (O-E)² /E

AA=(42 - 33.44) ² / 33.44

AA= 2.2

AB= (O-E)² /E

AB= (24 - 40.99)²/ 40.99

AB=7.04

BB=(O-E)² /E

BB= (21-12.563)²/12.563

BB= 5.66

Chi square= sum ((O-E)²/E) = 2.2 + 7.04 + 5.66 = 14.9

Degrees of freedom = genotypes - alleles = 3 - 1 = 2

p value less than 0.05

There is enough evidence to reject the nule hypothesis. The genotype frequencies are not in equilibrium.

5 0

4 years ago

During protein synthesis, the peptide bond between amino acids is formed by the process of _____.

taurus [48]

During protein synthesis, the peptide bond between amino acids is formed by the process of condensation. Condensation is a reaction when two smaller molecules (in this case amino acids) make a larger molecule(protein) and water as a side product.

8 0

3 years ago

How do Taxol and Nocodazole affect microtubules, and subsequently the developing organism?

blondinia [14]

Answer:

Taxol induces the assembly of microtubules, while Nocodazole suppresses tubulin assembly

Explanation:

Taxol and nocodazole are antimitotic drugs, i.e., drugs that inhibit the progression through the cell cycle, which is useful for killing cancer cells. Microtubules are proteins that act as the 'skeleton of the cell', which need to be reorganized when cells replicate. These structures (microtubules) are composed of α and β-tubulin heterodimers which assemble into protofilaments of microtubules. Taxol is an antimitotic drug that induces the formation of microtubules, thereby inhibiting microtubules' reorganization during mitosis. In consequence, cells treated with Taxol enter into apoptosis (i.e., programmed cell death). Moreover, Nocodazole is known to induce microtubule disassembly by interfering with the polymerization of tubulin monomers. In consequence, Nocodazole is useful to depolymerize the microtubule cytoskeleton.

4 0

3 years ago