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Korolek [52]
3 years ago
7

12. What kind of rocks are used to determine the age of Earth?

Biology
1 answer:
Fofino [41]3 years ago
7 0

Answer:

Igneous rocks and Metamorphic rocks determine the age of the earth.

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Which of the following does not represent a common outcome following introduction of foreign DNA into a bacterial cell?Choose on
AleksandrR [38]

Answer:

The correct option is A, since if the DNA enters in a circular form it is called a plasmid, and the plasmids upon entering the bacteria self-replicate outside the genetic structure, which gives the bacteria better survival qualities.

Explanation:

Plasmids are generally circular extrachromosomal DNA molecules that replicate and transmit independently of chromosomal DNA, and are normally present in bacteria, archaea, and sometimes in eukaryotic organisms such as yeast. Its size varies from 3 to 10 kb. The number of plasmids can vary, depending on their type, from a single copy to a few hundred per cell. Plasmid vectors allow cloning of exogenous DNA ligands of up to 4 kb since a larger size than this makes cloning in these vectors difficult. The term plasmid was first introduced by the American molecular biologist Joshua Lederberg in 1952. Plasmids can only coexist as one or more copies in each bacterium, due to cell division they can be lost in one of the secreted bacteria.

5 0
3 years ago
Control and experimental groups. They repeated their experiment several times and found the results were the same.
Ira Lisetskai [31]

Answer: Experience 1 is the one that has the greatest reliability.

Explanation:    Because of this potential variation, biological experiments need to have a large sample size and preferably be repeated several times.  With more samples and repeating the experiment more often, the probability of arriving at a wrong conclusion due to random variation is diminished. As experience 1 has had several repetitions, it is the experience with a more reliable result.

3 0
3 years ago
The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds
LekaFEV [45]

The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds from late March through May. There are two pre-mating isolation mechanism at play here,

1. Ecological isolation: The habitats are different, hence the individuals of both the species do not meet. Ephemeral ponds are temporary ponds that develop during rainy days, while the permanent ponds are full of water throughout the year.

2. Temporal isolation: The time of mating is different for both the species to avoid contact between the individuals of closely related species. Red-legged frogs mate in January to March slot and the bullfrog in the March to May slot.

8 0
3 years ago
Read 2 more answers
When DNA is copied sometimes a new incorrect base pairing appears within the structure of a new DNA molecule replacing original
statuscvo [17]
I believe you meant to say is this mistake called a base pair and if that is your question then no. it would be called Mutation. But you can double check that answer.
6 0
3 years ago
Several genes control human eye color. because of this, eye color shows a continuous variation from very dark brown to green to
Dmitriy789 [7]
The above is an example of a polygenic trait. This implies every prevailing allele "includes" to the declaration of the following predominant allele. As a rule, qualities are polygenic when there is a wide variety in the characteristic. For instance, people can be a wide range of sizes. Stature is a polygenic characteristic, controlled by no less than three qualities with six alleles.
3 0
2 years ago
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