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2 years ago

Which of the following does not

Biology

2 answers:

Snezhnost [94]2 years ago

5 0

Answer: D) located in the lysosomes

lisov135 [29]2 years ago

4 0

Answer

i think the answer is D

Explanation:

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Chromosomal regions that represent evolutionary vestiges of duplicated copies of genes that have underdone sufficient mutations

nlexa [21]

Answer:

pseudogenes

Explanation:

Pseudogenes are nonfunctional segments of DNA that resemble functional genes.

8 0

3 years ago

Mechanical digestion, the process of breaking down large chunks of food into smaller pieces, is important because smaller pieces

TEA [102]

The answer is Have a large surface area on which chemical enzymes in the digestive system can act on it. This increases the rate of digestion and absorption of the nutrients. The smaller an object is, the larger the surface area to volume ration it has compared to relatively larger objects.

7 0

2 years ago

Read 2 more answers

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.

8 0

3 years ago

Explain what happens when hypothermia sets in (when enzymes get too cold!)

Scorpion4ik [409]

Answer:

The shape of an enzyme also depends on its temperature. When enzymes get too warm, they get too loose. And when they get too cold, then they get too tight. Since the function of this enzyme depends on its temperature, the chemical reaction will only take place when the temperature is just right.

Hope this helped

6 0

3 years ago

The moth species Biston betularia has two color morphs, or variants. One has a speckled white and black color, while the other i

Oksana_A [137]

Answer:

D. Changes in the environment changed each morph's ability to evade predation in different ways.

Explanation:

The moth species Biston betularia has two color morphs, or variants. One has a speckled white and black color, while the other is all black. Over the period of time, the distribution of moths dramatically changed between 1900 and 1950 in such a way that black morph became dominant but speckled morphs became very much declined in abundance. The reasons behind this change was heavy industrial pollution in UK between 1900 and 1950.

When the environment became very polluted, dark and blackish, the speckled moth had more chanced of getting eaten by predators thats why they declined in number as compared to black morphs. On the other hand, backgrounds of grime and soot made black morphs less visible to the predators and they survived well. This is an excellent example of natural selection that only those specie better survive that have the ability to cope better with adverse environmental fluctuations.

Therefore, option D is best option.

Hope it help!

8 0

2 years ago