What is the season in the northern hemisphere when the North Pole points most directly toward the sun

Biology

1 answer:

Mashcka [7]2 years ago

8 0

That instant ... typically some moment on june 21 or 22 ... marks
the beginning of the northern hemisphere Summer.

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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their e

cricket20 [7]

Answer:

The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.

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3 years ago

With the exception of the 12 cranial nerves, other major nerves exit the brain through the:

Oksana_A [137]

I think the answer should be medulla oblongata or foramen magnum.

The major nerves that leave brain should form a thick cord in the brain stem that called medulla oblongata. Medulla oblongata will pass a big hole in the base of the skull that called foramen magnum. Depends on what part the question asked(bone or tissue), it probably between those two options.

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2 years ago

Answer for brainlist

vredina [299]

B!!!!!!!!!!!!!!!!!!!!!!!!!!

8 0

3 years ago

What would be the main problem if every trait followed a blending pattern?

Alona [7]

Answer:

Blending inheritance leads to the averaging out of every characteristic, which as the engineer Fleming Jenkin pointed out, would make natural selection impossible if blending were the mechanism of inheritance.

Explanation:

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2 years ago

Light stimuli entering the eye encounter a series of structures while traveling to the brain. Place the structures in the correc

ch4aika [34]

Answer:

The correct answer is "1. cornea 2. retina 3. rods and cones 4. ganglion cells

5. optic nerve 6. thalamus 7. primary visual cortex"

Explanation:

Light must pass a series of structures for the brain being able to interpret the data that comes from the eyes. The order that light stimuli travels from the eye to the brain is as follows:

1. cornea

2. retina

3. rods and cones

4. ganglion cells

5. optic nerve

6. thalamus

7. primary visual cortex

Light enters trough the cornea, the transparent front part of the eye that covers two-thirds of its total optical power; then it goes to the retina which receives the image that could go to the rods or the cones (depending if the light is at low or high levels, respectively). Then, ganglion cells increase the rate of the impulse within the optic nerve, and finally thalamus passes the sensory signal to the primary visual cortex. In this area of the brain, the basic visual features are extracted and interpreted.

6 0

3 years ago