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Elena-2011 [213]
3 years ago
6

Which of the following is NOT true about cells? (PLEASE ANSWER ASAP!!)

Biology
1 answer:
Alenkinab [10]3 years ago
3 0
I'm pretty sure it's A that isn't true. Cells change over time, if I remember correctly.
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Multiple anterior rootlets arise from the spinal cord and merge to form a single ____________ root, which contains ____________
Natalka [10]

Answer:

Explanation:

Multiple anterior rootlets arise from the spinal cord and merge to form a single anterior root. which contains Anterior roots contain motor axons only.

These axons arise from cell bodies in the anterior and lateral horns of the spinal cord.

Posterior rootlets arise from a single posterior root,which contains sensory axons only.

The cell bodies of these neurons are located in a posterior root ganglion , which is within the posterior root. Each anterior root and its corresponding posterior root unite within the intervertebral foramen to become a spinal nerve.

6 0
3 years ago
In a famous experiment, Matthew Meselson and Franklin Stahl grew E. coli cells in a medium containing only the "heavy" isotope o
Alex777 [14]

Answer:

3rd generation = 2 Hybrid DNA molecules + 6 Light DNA

In Percentage 2÷8 × 100 = 25%

25% of the DNA are hybrid

Explanation:

Semi conservative model proposed by Watson and Crick states that one strand of the DNA comes from parent DNA which act as a template for the other newly formed strand.

First generation:

If cells containing 15 N DNA are transferred to a medium with only 14 N then in initial first generation two parent strands becomes separated and act as template for newly synthesized strands. this means that in first generation both DNA molecules are hybrid, one strand of 15 N DNA and other strand of 14 N DNA

Ist generation = 2 Hybrid DNA molecules

Second generation:

In Second generation these two hybrid molecules become unzip. Two strands are 15N and two strands are 14N. All these 4 strands act as template and 4 new strands are synthesized. The molecules of Hybrid DNA is still 2 with 2 molecules of Light DNA.

2nd generation = 2 Hybrid DNA molecules + 2 Light DNA

Third generation:

In Third generation these two hybrid molecules and two light DNA molecules become unzip. Two strands are of 15N and six strands are of 14N. All these 8 strands act as template and 8 new strands are synthesized. The molecules of Hybrid DNA is still 2 with 6 molecules of Light DNA.

3rd generation = 2 Hybrid DNA molecules + 6 Light DNA

In Percentage 2÷8 × 100 = 25%

25% of the DNA are hybrid

4 0
3 years ago
Over time, color variation in a population of butterflies declined. The number of color variations within the population was twe
bazaltina [42]

B

12345678910111121314151617181920

4 0
3 years ago
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Explain why the amount of water a person needs to survive can be highly variable.
SVETLANKA909090 [29]

Answer:

Not only is water necessary for the physical survival of humans, but many, if not most, human activities also make use of it. Agriculture is critically dependent upon continual supplies of freshwater. Human households also use freshwater daily for cleaning and laundry as well as for transporting sewage to waste treatment plants.

8 0
3 years ago
Which of the following is NOT made up of atoms?<br> “Heat”<br> “A gas”<br> “A cell”<br> “A solid”
kykrilka [37]
Cell, and gas are for sure made up of atoms so it’s either heat or a solid
6 0
3 years ago
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