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4 years ago

PLEASE HELP

Biology

1 answer:

Wewaii [24]4 years ago

7 0

Answer:

hope this helps you're welcome

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Which of the following is not considered a type of mass movement?

s344n2d4d5 [400]

B) Landslides

Hope this helped, If it did mark me brainliest:)

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3 years ago

The plasma membrane represents an energetic barrier to the free diffusion of ions from the extracellular space into the cytoplas

Marysya12 [62]

Answer:

Why are molecules such as valinomycin effective at transporting ions across the membrane?

Valinomycin is effective as transporting ions across the membrane because it is no charged, so it can carry ions.

Why would a drop in temperature to or below the transition temperature limit valinomycin mediated K+ transport across the plasma membrane?

Valinomycin is limited by temperature because its activity is highly sensitive and it depends on a stable and an average temperature.

Explanation:

Valinomycin is effective at transporting ion across the membrane because is an antibiotic that alternates hydroxy and amino acid, ans it helps membranes to be permeable. Valinomycin is a cyclic molecule that helps in ions transportation through membranes. Also, antibiotics have a temperature range of activity, that's why it is sensitive to changes.

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3 years ago

n cattle, an autosomal mutation called Dexter produces calves with short stature and short limbs. Embryos that are homozygous fo

timofeeve [1]

Answer:

1 DDRR - Red, non-dexter

2 DDRr - Roan, non-dexter

2 DdRR - Red, dexter

4 DdRr - Roan, dexter

1 DDrr - white, non-dexter

2 Ddrr - white, dexter

Explanation:

Dexter is deleterious in homozygous condition, hence, phenotypes are heterozygous.

Roan are also heterozygous.

If dexter allele is represented by D, non dexter individuals will be DD dexter individuals will have the genotype Dd.

If colour in cattle is represented by R, red individuals will be RR, white will be rr, then roan colour will be Rr.

Hence, roan dexter cow and roan dexter bull will both have DdRr genotypes.

Crossing the two: DdRr x DdRr

Progeny:

1 DDRR - Red, non-dexter

2 DDRr - Roan, non-dexter

2 DdRR - Red, dexter

4 DdRr - Roan, dexter

1 DDrr - white, non-dexter

2 Ddrr - white, dexter

Others that are either aborted or stillbirths include:

1 ddRR

2 ddRr

1 ddrr

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3 years ago

In which of the following ways do the cell membranes of Archaea differ from the cell membranes found in bacteria?

Artist 52 [7]

A) The Archaea have cell membranes made of ether-linked hydrocarbons which branch, while Bacterial membranes are made of ester-linked fatty acids.

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3 years ago

Points A, B, and Care: D E С А B 'F What’s the answer

Alona [7]

Answer:

DE.......................................

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3 years ago