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Bess [88]
2 years ago
10

Double-stranded DNA looks a little like a ladder that has been twisted into a helix, or spiral. The side supports of the ladder

are
a. individual nitrogenous bases.
b. alternating bases and sugars.
c. alternating bases and phosphate groups.
d. alternating sugars and phosphates.
e. alternating bases, sugars, and phosphates.
Biology
1 answer:
coldgirl [10]2 years ago
5 0

Answer:

d) alternating sugars and phosphates.

Explanation:

DNA is a molecule which acts as the genetic material of the organisms on Earth. The DNA is made of the monomer units called nucleotides which are composed of a sugar called deoxyribose, a phosphate group and two types of nitrogenous bases (purines and pyrimidines).

The DNA structure is known as the double-helical model which gives a ladder-like appearance in a twisted manner. The backbone of the ladder or DNA is made of the deoxyribose sugar and the phosphate group whereas the nitrogenous bases are arranged inside the DNA.

Thus, option-D is the correct answer.

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Consider a cross of beetles with exoskeleton alleles B and b and leg size alleles N and n. The maleparent is heterozygous in bot
vichka [17]

Answer:

a. Genotype of male parent= BbNn

Genotype of female parent: bbnn

b: Progeny ratio= 1: 1: 1: 1

c: 1/4

Explanation:

a. Genotype of male parent= BbNn

Genotype of female parent: bbnn

b. Gamete formed by the male parent: BN: Bn: bN: bn in 1:1:1:1 ratio.

Gametes formed by female parent: All gametes with "bn" alleles.

c.  The probability that the offspring will have a genotype of Bbnn=

Bb x bb= 1/2 Bb: 1/2 bb

Nn x nn= 1/2 Nn: 1/2 nn

Therefore, probability that the offspring will have a genotype of Bbnn= 1/2 Bb x 1/2 nn= 1/2.

5 0
2 years ago
Explain what friction corollas and a low pressure gradient does to an air parcel?
Kipish [7]

Answer with Explanation:

Coriolis Force - refers to the fictitious force that acts perpendicularly to the direction of a rotating motion.

Air parcel - refers to a body of air that is <em>"imaginary."</em>

Pressure gradient - the change in pressure across a given distance.

Pressure gradient force - the net force that is being directed from high pressure to low pressure.

When an<em> air parcel is at rest, </em><u>the pressure gradient force acts upon it.</u> It will then move from<em> high pressure to low pressure.</em>

However, when the air parcel starts to be in motion, its direction will be changed with the help of the Coriolis force. Thus, it moves to the right side of the Northern hemisphere.

Once the speed of the wind increases, the change in direction of the air parcel increases. This happens until the pressure gradient force and the Coriolis Force are equal in magnitude. When this happens, the wind will start blowing parallel to the points of equal pressure. The wind will now then be referred to as in "geostrophic balance."

When friction happens, the geostrophic balance breaks. The flow of the wind will be slowed down. This means that the Coriolis force will also be lessened. The air parcel will then move towards the lower region.

6 0
2 years ago
An aquifer is a rock layer that stores and allows the flow of groundwater. Compared to other types of rock layers, how permeable
AVprozaik [17]

Highly porous and permeable

Explanation:

Compared to other types of rock layers, an aquifer is highly porous and permeable.

Aquifers are always the target when prospecting for ground water in a formation.

  • Porosity is the amount of void spaces in a rock.
  • Aquifers are highly porous .
  • Permeability is the inter-connectivity of the void spaces and their ability to transmit fluids.
  • Aquifers have very high permeability compared to other rock types.

In terms of permeability and porosity, an aquifer is higher porous and permeable.

learn more:

Biogeochemical cycle brainly.com/question/3509510

#learnwithBrainly

6 0
2 years ago
The figure below illustrates a eukaryotic cell. Which of the following best describes how the three structures indicated by the
aivan3 [116]

Answer: B.) To synthesize and isolate proteins for secretion or for use in the cell.

Explanation:

4 0
2 years ago
Read 2 more answers
If intelligence is determined primarily by heredity, which pair should show the highest correlation between IQ scores?
vagabundo [1.1K]

Answer:

The options

a) fraternal twins

b) identical twins

c) brothers and sisters

d) parents and children

The CORRECT ANSWER IS b)

b) identical twins

Explanation:

Identical twins both acquire identical genetic material. Therefore, if intelligence is basically controlled by heredity, you would foresee identical twins to possess the biggest correlation between IQ scores since they share 100 percent of the same genes

7 0
2 years ago
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