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alekssr [168]
3 years ago
6

Over the last several decades, what have researchers discovered about atmospheric CO2 levels?1 They have decreased.2 They have i

ncreased.3 They have remained the same.4 They increased for a period, but have now stabilized.
Biology
1 answer:
Anna11 [10]3 years ago
4 0

Answer:

they have increased

Explanation:

What happens with pollution is that every day are tons of CO2 liberated to the atmosphere. those tons of pollution supose to be regulated by the states, but that is not what actually happens in third world countries there is an almost uncontrolable increase of CO2 liberation at the atmosphere. In the first world countries it's more controlled but still haven't decreased the CO2 levels released into the atmosphere.

The CNN (an spanish daily paper) said: the CO2 levels are the highest in the last 3 million years, in a new released the past april.

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RNA is produced by
Studentka2010 [4]

Answer:

Explanation:

rna is produced in the transcription stage of protein synthesis whereby complementary base pairing occurs

8 0
3 years ago
Approximately 90% of human cancer cells exhibit significant levels of telomerase. Does this mean that telomerase is an oncogene?
alukav5142 [94]

Answer:

No, telomerase is not an oncogene. It prevents the senescence that would occur due to shortened telomeres, but the cell proliferation might still be mitogen-dependent.

Explanation

telomerase is not responsible for causing  deregulation while oncogenes cause deregulation .

Telomeres length shorten after the cell division which stops them to divide again and cell die.

Telomerase prevents this decline in some kinds of cells, including stem cells, by lengthening telomeres, and the hope was that activating the enzyme could  prevent senescence.

6 0
3 years ago
The testcross makes it possible to determine the genotype of an individual of unknown genotype who exhibits the dominant version
klio [65]

Answer:

All of the above answer choices are correct.

Explanation:

Test cross is done to find out the genotype of an individual displaying dominant phenotype as it can be homozygous or heterozygous. To find this the individual is crossed with a recessive phenotype individual. For example: a dominant trait tall height can be homozygous TT or heterozygous Tt. If it is TT all the offspring of test cross with tt will be tall. If it is Tt half of the offspring will be tall and half of the offspring will be short.

Multiple offspring are required to come to the final result because offspring production happens in random order and it might take a few tries before another type of phenotype is produced. For example: If a test cross produces an individual with dominant phenotype we can still not surely say if the test individual is homozygous or heterozygous because both can produce dominant phenotype in test cross. We need more offspring to check if the recessive phenotype is produced or not and accordingly decide the genotype of test individual.

Hence all of the above answer choices are correct.

6 0
3 years ago
What are the 5 steps in protein synthesis?
7nadin3 [17]

Answer:

(a) Activation of amino acids

(b) Transfer of amino acid to tRNA

(c) Initiation of polypeptide chain

(d) Chain Termination

(e) Protein translocation

3 0
3 years ago
Read 2 more answers
4. A friend says cells do nothing during<br> interphase. Do you agree or disagree?<br> Explain why.
valentinak56 [21]

Answer:

Disagree

Explanation:

During interphase, the cell copies its DNA in preparation for mitosis.

it spends its whole life doing this.

7 0
3 years ago
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