1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
BabaBlast [244]
3 years ago
7

Destruction of tundra vegetation will likely result in _____.

Biology
1 answer:
Nezavi [6.7K]3 years ago
5 0
Okay. The destruction of tundra vegetation will not really freeze the soil or deepen the active zone much. Therefore, A and C are eliminated. The destruction of the vegetation can actually melt permafrost, which contributes to global warming. The answer is D.
You might be interested in
6. (3 pts) After transformation, 40 colonies were present on the plate. What is the transformation efficiency of the competent c
natali 33 [55]

Answer:

Given:

Number of colonies on plate = 40

Amount of DNA used for transformation = 100ng

Volume of competent cells used = 100ul

Total volume = 1ml (1000ul)

Volume plated for growth = 200ul

The amount of cells transformed per 1 µg of DNA is called the transformation efficiency

(CFU is colony forming units) => (number of colonies on plate/ng of DNA plated) X 1000 ng/µg = CFU/µg of DNA

Amount of DNA used for plating = 100ng * (200/1000)

                                                      = 100ng * (1/5)

                                                      = 100/5 = 20ng

Efficiency calculation = 40 colonies / 20ng = 2 colonies/ng

               (2 colonies/ng) * (1000 ng/µg) = 2000 CFU/ug DNA

Transformation efficiency = 2000 Transformants / ug DNA

                                          = 2 x 10³ Transformants / ug DNA

Explanation:

Efficiency of transformation is highest in the 100 pg-1 ng range, so Low transformation efficiency could be because of high amount of DNA used for transformation.

6 0
3 years ago
A expresses dna that has been derived from another species. 2. dna that has been altered to contain genes, or portions of genes,
OlgaM077 [116]
1. A transgenic organism expresses DNA that has been derived from another species. These organisms have altered genomes and are generated in the laboratory for the purposes of research, for example, the "knock-out" mice are tansgenic mice with a particular gene of interest disabled. 
2. Recombinant DNA is the DNA that has been altered to contain genes, or portions of genes, from different organisms. The DNA molecules are formed in the lab using recombination methods to bring together genetic material from multiple sources and therefore creating sequences that are not found in the genome. 
3. Restriction enzymes are found naturally in bacteria and they cut DNA at specific nucleotide sequences. These enzymes are also called restriction endonucleases, they cleave DNA into fragments at or near specific recognition sites called restriction sites. They are found in bacteria and archaea and they serve to provide a defense mechanism against invading viruses.
4. Biotechnology is the use or alteration of organisms, cells, or biological molecules to produce food, drugs, or other goods. Living systems and organisms are used to make or develop products. Biotechnology enhances cellular and biomolecular processes to develop technologies and product for the purposes of improving life and health. 
5. Polymerase chain reaction is a technique that is used to quickly synthesize billions of copiies of a specific segment of DNA.  It is a quick and a very efficient way to generate many copies of DNA.  The process is applicable when there are small quantities of DNA to analyze. The events of PCR involves; separation of DNA strands, addition of primers, use of DNA polymerase to produce second strand of DNA. 
6. In the process known as transformation, bacteria take up pieces of DNA from the surroundings. Bacterial transformation results from the uptake of naked DNA (DNA without associated cells or proteins). Transformation may also occur naturally in some species of bacteria.  

8 0
3 years ago
Read 2 more answers
Blockage of the _____ can reduce blood supply to the brain, causing a stroke.
galben [10]
<span>Blockage of the Cerebral Artery can reduce blood supply to the brain, causing a stroke (Ishcemic Stroke) Blood is carried to the brain by two pair of arteries, i) The Internal Carotid arteries, ii) The Vertebral arteries. Stroke is a neurovascular condition affecting blood vessels in the brain. There are two types of Stroke i) Ischemic Stroke ii) Hemorrhagic Stroke. In Ischemic stroke occlusion of a cerebral artery causes the damage to brain tissue dependent on blood supply from the affected vessel</span>
3 0
3 years ago
What is meant by the overload principle? what is meant by the overload principle? stretching a muscle group beyond the joint's h
valentinak56 [21]
<span>This principle, or thought process, is that in basic sports fitness programs, all athletes training to continuously improve must always work harder an harder as their bodies become more used to their existing work out routines.</span>
3 0
3 years ago
A dog experiencing a high level of fear will usually exhibit
Cerrena [4.2K]
I believe the correct answer is D. <span>ears pinned back, eyes averted or lowered, and lips pulled back and down.
When dogs are afraid, their ears are lowered to show fear because of something they may have done wrong. They are also scared or embarrassed to look at their owner because they know they will receive some sort of punishment. Their tail is also usually tucked between their legs to show they are afraid.
</span>
8 0
3 years ago
Other questions:
  • What types of cells are most sensitive to radiation damage?
    8·1 answer
  • The optic nerve is located in which cavity?
    15·1 answer
  • Unfortunately two-dimensional maps usually show in area shape or scale.?
    13·2 answers
  • Bryophytes are known as non-vascular plants. What makes them non-vascular?
    6·1 answer
  • Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes). Among the halophiles, mannitol fermenters
    15·2 answers
  • Mycorrhizae are associations formed by fungi that grow on the roots of trees. These fungi penetrate into the roots of the trees.
    8·1 answer
  • Fats are absorbed by the epithelial cells of villi in the intestinal tract and enter the capillary beds of the circulatory syste
    6·1 answer
  • Rafael models a longitudinal wave using a coiled-spring toy. If he wants to model a longitudinal wave that carries more
    8·1 answer
  • What is the total number of chromosomes present in the human cell before meiosis?
    14·1 answer
  • Symbiotic relationship between two species in which one organisms benefits and causing harm to the other
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!